Polyacetal Resin TENAC™

What is TENAC™ ?

TENAC™ is the trademark of polyacetal resin manufactured and sold by Asahi Kasei.

TENAC™ is our polyacetal resin that was named after “TENAX” meaning “tough” in Latin.
The polyacetal resin is a well-balanced engineering plastic featuring superb mechanical characteristics including strength and rigidity, as well as excellent friction and wear characteristics, dimensional stability, and resistance to oils and organic solvents.
Asahi Kasei has high viscosity grades such as TENAC™ “2010” and “3010” with excellent durability and toughness, TENAC™ “MG210” with improved creep resistance by utilizing our unique crystallinity control technology.
We also have a lineup of VOC grades (“Z series”) which has low formaldehyde emission during use.
Currently, these materials are used for automobiles, for example, in motor gears, mechanical parts, and interior materials, etc.
Our extensive product lineups ensure provision of optimal grades for customers according to applications.

Features of TENAC™

The features of TENAC™ among general-purpose engineering plastics are shown below.

Advantages

1. Excellent wear and friction resistance for a long time
2. Excellent fatigue and creep properties.
3. Excellent resistance against oils and organic solvents

Disadvantages

Common to homopolymers and copolymers
1. There is no flame retardancy higher than UL94 standard V-1.
2. Please be careful when using in contact with acidic substances.
Homopolymer
1. Please be careful when using in contact with hot water.

Production for TENAC™

TENAC™ resins are manufactured in an integrated manner from raw materials to products using proprietary technology.

TENAC™ Application cases

Fuel pump module

It is a part that is mounted on the fuel tank of a vehicle and has a built-in pump and fuel filter in the lower case, and sends purified fuel from the upper flange to the engine.
The main parts are made of POM resin, which has excellent fuel resistance.

Products

TENAC™

Features

・Excellent fuel resistant property.
・Excellent creep resistance.

Inside door handle / case

・Achieves the UV resistance and chemical resistance required for automobile interior parts without painting.
・Changes in the mechanical properties and color tone due to heat aging and UV irradiation have cleared the standards of each OEM.
・It complies with OEM in-vehicle environmental standards (reduction of volatile components), which are becoming stricter year by year.

Products

TENAC™

Grades

TENAC™-C Z4513:Medium viscosity, low formaldehyde emisson, UV resistant copolymer grade
TENAC™-C ZM413:Medium viscosity, low formaldehyde emisson , UV resistant, metallic appearance copolymer grade

Features

・Low VOC (Volatile Organic Compound) property of the highest level in the industry.
・Excellent UV resistance.
・The metallic appearance grade enables high designed product surface without painting.

Through anchor

The through anchor is installed on the center pillar, and the metal parts are coverd with POM resin to maintain the slidability with the seat belt made from polyester.
In addition, high-viscosity UV-resistant homopolymer grade 3013A is used because it is required to have impact resistance in the automobile crash and UV resistance because it is an interior part.

Products

TENAC™

Grades

TENAC™ 3013A:Ultra-high viscosity UV resistant homopolymer grade

Features

・UV resistance
・Excellent imapct strength.

Seat-belt press button

・It has the high UV resistance and low formaldehyde emisson properties required for automobile interior parts.
・It has excellent impact strength and is not easily damaged even in an emergency.

Products

TENAC™

Features

・Industry's highest level of low VOC (volatile organic compound) performance
・UV resistance
・Impact strength

Motor gear

Since the gears used in the motors that window lifters, wipers, seats, etc. are required to have high durability, high-viscosity homopolymers are mainly used.

Products

TENAC™

Features

・Excellent durability.
・Excellent creep property.
・Weight reduction is possible by replacing metal with POM resin.

Window regulator(Carrier plate)

POM is often used for window regulators (wire type), which are elevating devices for window glass, because of their excellent slidability and durability.
The carrier plate is made from ultra high viscosity homopolymer, which has superior fatigue resistance and high creep resistance,because it supports the window glass and receives a long-term load.

Products

TENAC™

Features

・Excellent durability
・Superior fatigue resistance, excellent creep property
・Weight reduction is possible by replacing metal with POM resin.

Door roller

Door roller opens and closes the sash smoothly.
In recent years, sashes have become heavier due to improved heat insulation and the use of double glazing.
Due to the increased load on the door roller, TENAC™ ultra-high viscosity grades are used for its excellent durability.

Products

TENAC™

Grades

・TENAC™ MG210: Ultra-high viscosity and high durability homopolymer grade
・TENAC™ 2010: Ultra-high viscosity homopolymer grade

Features

・Excellent creep property
・Low friction and wear for slinding metal

Printer gear

Gears transmit torque and rotation to the meshing gears by rotating around an axis.
The performance required for resin gears is rigidity, durability, slidability and quietness, and static and dynamic dimensional accuracy, and
TENAC™ has a lineup of numerous grades that meet the required characteristics of each.

Products

TENAC™

Grades

・ LZ750
・High stiffness / high precision copolymer grade NS556;
Inorganic filler reinforced grade that achieves both high stiffness and high precision
・High flowability and excellent slidability copolymer grades, LZ750 and LX750 ;
These two grades are based on the high-performance copolymer HC750, and different sliding agents are used for these grades.

Features

・Good slidability
・Highly precision moldability

Printer mechanical parts
(TENAC™)

・There are wide variety of mechanical parts for printers.
Typical items are shafts, bearings, arms, rollers, cams, etc.
・These products are required to have little change in performance over a long period of time.
・Rigidity and wearability are required for shafts and bearings to maintain the hole diameter, and resistance to deformation during repeated fatigue is required for arms and cams.

Products

TENAC™

Grades

・High-performance copolymer grade, HC750, HC450 ;
These polyacetal resins balances the mechanical properties of homopolymer and thermal resistance of copolymer.
・High flowability and Excellent slidability copolymer grades, LZ750 and LX750 ;
These two grades are based on the high-performance copolymer, HC750, and different sliding agents are used for these grades.

Features

・TENAC™ is a material with excellent durability, fatigue and slidability as well as mechanical properties.
・In particular, HC series , which has both the good points of homopolyner and copolymer, are the material suitable for mechanical parts.
・LZ and LX series, which has a sliding prescription based on HC series, has excellent sliding performance as well as mechanical properties.
・Due to its excellent flowability, it can be molded to thin products.

Conductive bearing

By adding various conductive carbon to non-conductive plastic, it is possible to replace electrical contact parts and ground parts that were previously metal.
It is superior in terms of productivity and cost because parts can be manufactured only by molding without secondary processing.

Products

TENAC™

Grades

・TENAC™ C-TFC77, TFC84
・Conductive copolymer grade

Features

・All grades have excellent conductivity with a volume resistance of 100 to 101Ωcm.
・TFC77 has extremely stable conductivity and slidability.
・TFC84 has stable conductivity and excellent toughness.

Infusion pump guide

・Infusion pumps are required not only to deliver the required amount of liquid stably over a long period of time and to reduce the size.
・Since the liquid feed part is always in contact with the medical tube, this part is required to have abrasion resistance.
Therefore, TENAC™ high sliding grade is applied to these parts.

Products

TENAC™

Grades

High sliding performance grade
For many years, Asahi Kasei has pursued the highest level of friction and wear characteristics and mechanical properties, and has provided the TENAC™ high sliding grade to the market.
We propose the optimum grade in combination with the counter material.

Features

・Dimensional stability
・Durability
・High load slidability

Lancet

・Lancet is used for micro blood sampling such as blood glucose measurement.
・TENAC™ is used from the viewpoint of injection moldability and good puncture property.

Products

TENAC™

Grades

High flow homopolymer grade

Features

・High flowability
・Antistatic property
・Low warpage deformability
・High crystallization rate

Fuel pump module

It is a part that is mounted on the fuel tank of a vehicle and has a built-in pump and fuel filter in the lower case, and sends purified fuel from the upper flange to the engine.
The main parts are made of POM resin, which has excellent fuel resistance.

Products

TENAC™

Features

・Excellent fuel resistant property.
・Excellent creep resistance.

Inside door handle / case

・Achieves the UV resistance and chemical resistance required for automobile interior parts without painting.
・Changes in the mechanical properties and color tone due to heat aging and UV irradiation have cleared the standards of each OEM.
・It complies with OEM in-vehicle environmental standards (reduction of volatile components), which are becoming stricter year by year.

Products

TENAC™

Grades

TENAC™-C Z4513:Medium viscosity, low formaldehyde emisson, UV resistant copolymer grade
TENAC™-C ZM413:Medium viscosity, low formaldehyde emisson , UV resistant, metallic appearance copolymer grade

Features

・Low VOC (Volatile Organic Compound) property of the highest level in the industry.
・Excellent UV resistance.
・The metallic appearance grade enables high designed product surface without painting.

Through anchor

The through anchor is installed on the center pillar, and the metal parts are coverd with POM resin to maintain the slidability with the seat belt made from polyester.
In addition, high-viscosity UV-resistant homopolymer grade 3013A is used because it is required to have impact resistance in the automobile crash and UV resistance because it is an interior part.

Products

TENAC™

Grades

TENAC™ 3013A:Ultra-high viscosity UV resistant homopolymer grade

Features

・UV resistance
・Excellent imapct strength.

Seat-belt press button

・It has the high UV resistance and low formaldehyde emisson properties required for automobile interior parts.
・It has excellent impact strength and is not easily damaged even in an emergency.

Products

TENAC™

Features

・Industry's highest level of low VOC (volatile organic compound) performance
・UV resistance
・Impact strength

Motor gear

Since the gears used in the motors that window lifters, wipers, seats, etc. are required to have high durability, high-viscosity homopolymers are mainly used.

Products

TENAC™

Features

・Excellent durability.
・Excellent creep property.
・Weight reduction is possible by replacing metal with POM resin.

Window regulator(Carrier plate)

POM is often used for window regulators (wire type), which are elevating devices for window glass, because of their excellent slidability and durability.
The carrier plate is made from ultra high viscosity homopolymer, which has superior fatigue resistance and high creep resistance,because it supports the window glass and receives a long-term load.

Products

TENAC™

Features

・Excellent durability
・Superior fatigue resistance, excellent creep property
・Weight reduction is possible by replacing metal with POM resin.

Door roller

Door roller opens and closes the sash smoothly.
In recent years, sashes have become heavier due to improved heat insulation and the use of double glazing.
Due to the increased load on the door roller, TENAC™ ultra-high viscosity grades are used for its excellent durability.

Products

TENAC™

Grades

・TENAC™ MG210: Ultra-high viscosity and high durability homopolymer grade
・TENAC™ 2010: Ultra-high viscosity homopolymer grade

Features

・Excellent creep property
・Low friction and wear for slinding metal

Printer gear

Gears transmit torque and rotation to the meshing gears by rotating around an axis.
The performance required for resin gears is rigidity, durability, slidability and quietness, and static and dynamic dimensional accuracy, and
TENAC™ has a lineup of numerous grades that meet the required characteristics of each.

Products

TENAC™

Grades

・ LZ750
・High stiffness / high precision copolymer grade NS556;
Inorganic filler reinforced grade that achieves both high stiffness and high precision
・High flowability and excellent slidability copolymer grades, LZ750 and LX750 ;
These two grades are based on the high-performance copolymer HC750, and different sliding agents are used for these grades.

Features

・Good slidability
・Highly precision moldability

Printer mechanical parts
(TENAC™)

・There are wide variety of mechanical parts for printers.
Typical items are shafts, bearings, arms, rollers, cams, etc.
・These products are required to have little change in performance over a long period of time.
・Rigidity and wearability are required for shafts and bearings to maintain the hole diameter, and resistance to deformation during repeated fatigue is required for arms and cams.

Products

TENAC™

Grades

・High-performance copolymer grade, HC750, HC450 ;
These polyacetal resins balances the mechanical properties of homopolymer and thermal resistance of copolymer.
・High flowability and Excellent slidability copolymer grades, LZ750 and LX750 ;
These two grades are based on the high-performance copolymer, HC750, and different sliding agents are used for these grades.

Features

・TENAC™ is a material with excellent durability, fatigue and slidability as well as mechanical properties.
・In particular, HC series , which has both the good points of homopolyner and copolymer, are the material suitable for mechanical parts.
・LZ and LX series, which has a sliding prescription based on HC series, has excellent sliding performance as well as mechanical properties.
・Due to its excellent flowability, it can be molded to thin products.

Conductive bearing

By adding various conductive carbon to non-conductive plastic, it is possible to replace electrical contact parts and ground parts that were previously metal.
It is superior in terms of productivity and cost because parts can be manufactured only by molding without secondary processing.

Products

TENAC™

Grades

・TENAC™ C-TFC77, TFC84
・Conductive copolymer grade

Features

・All grades have excellent conductivity with a volume resistance of 100 to 101Ωcm.
・TFC77 has extremely stable conductivity and slidability.
・TFC84 has stable conductivity and excellent toughness.

Infusion pump guide

・Infusion pumps are required not only to deliver the required amount of liquid stably over a long period of time and to reduce the size.
・Since the liquid feed part is always in contact with the medical tube, this part is required to have abrasion resistance.
Therefore, TENAC™ high sliding grade is applied to these parts.

Products

TENAC™

Grades

High sliding performance grade
For many years, Asahi Kasei has pursued the highest level of friction and wear characteristics and mechanical properties, and has provided the TENAC™ high sliding grade to the market.
We propose the optimum grade in combination with the counter material.

Features

・Dimensional stability
・Durability
・High load slidability

Lancet

・Lancet is used for micro blood sampling such as blood glucose measurement.
・TENAC™ is used from the viewpoint of injection moldability and good puncture property.

Products

TENAC™

Grades

High flow homopolymer grade

Features

・High flowability
・Antistatic property
・Low warpage deformability
・High crystallization rate

Grade List / Search

TENAC™ (Homopolymer)

Standard High-Durability Low-VOC High-Cycle Weather-resistant Reinforced Lubricant Soft
High
Viscosity
2010
3010
MG210 Z3010 2013A
3013A
LT802
Medium
Viscosity
4010
4060
5010
4050 Z4060 5050 4013A
5013A
GA510
GA520
LT804
LT805
LT200
FS410
LP402
LA543
LM511
4012
High
Flowability
7010 7050
7054
GN705 LS701
Super High
Flowability
9054

 

TENAC™-C(Copolymer)

Standard Low-VOC High-Function Standard Anti-Scratch Weather-resistant Reinforced Lubricant Conductive Low Noise
High
Viscosity
3510 V3510
Z3510
Z3513
HC350 3513 LT350
Medium
Viscosity
4520
5520
Z4520
Z4513
Z4563
ZH450
ZLV40
HC450
HC550
HC460 4513
4563
GN455
G455X
G455S
G457X
G457S
CF452
CF454
NS556
LV450 TFC64
TFC84
TFC77
SG454
High
Flowability
7520
8520
9520
ZH760 HC750 HC760 7513 GN752
GN755
MT754
LZ750 EF750
EF850
LD755

Grade Search

TENAC™(Homopolymer)

TENAC™-C(Copolymer)

close

Product Data / Tips for Use

Important precautions for TENAC™

These data are based on the documents, information and data now available and may be changed when new knowledge or information is acquired. For the most current information, call Asahi Kasei Corporation at +81-3-6699-3388, or by facsimile at +81-3-6699-3472.

Safe Handling

The following is an essential guideline to the safe handling of TENAC™ and TENAC™-C as supplied. Always follow this guideline when handling TENAC™ and TENAC™-C. Please read the relevant material safety data sheet (available from Asahi Kasei Corporation) thoroughly before use. Various additives and processing aids used in fabrication have their own safe use profile and must be investigated separately.

Health and safety
Polyacetal resins generate gases, principally formaldehyde, during decomposition. Avoid contact with skin and eyes when gases are generated in the drying and melting of the resin. Also do not breathe the above gases. Do not touch hot resin. Local ventilation and wearing of chemical resistant gloves, chemical safety goggles, etc. are necessary when the resin is dried and melted. In case of emergency, call one of the following:

  • US: +1-800-424-9300 (Chemtrec)
  • EU: +32-(0)-1458-4545 (BIG v.z.w.)
  • Japan: +81-44-271-2417 or +81-44-271-2561 (Asahi Kasei)

Combustibility
As TENAC™ and TENAC™-C are flammable, keep them away from heat, sparks, and flame during handling and storing. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water or foam extinguishants as extinguishing media.

Disposal
Burn in a properly equipped incinerator or landfill in compliance with all applicable regulations. Any disposal practice must be in compliance with local and national laws and regulations (contact local or state environmental agency for specific rules). During incineration, irritating and highly toxic gases may be generated. Do not dump into sewers, onto the ground, or into any body of water.

Storing
Keep away from flame and heat sources. Avoid bag breakage, tearing, and water contact. Ensure stable, secure bag loading and stacking.

Molding
TENAC™ decomposes when the polymer is processed or held at temperature above 230°C (446°F) or molten polymer contacts a strong acid, oxidizing agent, or polyvinyl chloride.

TENACTM-Cdecomposes when the polymer is processed or held at temperature above 250°C (482°F) or molten polymer contacts a strong acid, oxidizing agent, or polyvinyl chloride.

Promptly remove and discard any spilled pellets from the work area to prevent slips and falls.

Proscribed Applications

Never use TENAC™ or TENAC™-C in any medical device or equipment designed or intended for intracorporeal implantation or direct contact with transfusion fluids.

Do not use TENAC™ or TENAC™-C for tap water pipes for long-term installation, such as in-wall or ground-buried pipes, since prolonged contact with chlorine (disinfecting agent) contained in tap water may cause decomposition of the polymer.

For specifics, refer to our division. Asahi Kasei Corporation encourages its customers to review their applications of its products from the standpoint of human health and environmental quality. To help ensure that Asahi Kasei Corporation products are not used in ways for which they are not intended or tested, Asahi Kasei Corporation representatives are willing to assist in dealing with ecological and product safety considerations.

DISCLAIMER OF WARRANTY AND LIABILITY
NOTICE:
Although the information and recommendations set forth herein are presented in good faith and believed to be correct, Asahi Kasei Corporation expressly disclaims any and all representations and warranties as to the completeness and accuracy thereof.

Information is supplied upon the EXPRESS CONDITION THAT THE PERSONS RECEIVING SAME WILL MAKE THEIR OWN DETERMINATION AS TO ITS SUITABILITY FOR THEIR PURPOSES PRIOR TO USE.

Asahi Kasei Corporation warrants only that this product will perform according to the technical specifications provided in the MSDS and other materials provided by it. NO OTHER REPRESENTATIONS OR WARRANTIES, EXPRESSED OR IMPLIED, WHETHER ORAL OR AISING BY USAGE OF TRADE OR COURSE OF DEALING, INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OF FITNESS OR MERCHANTABILITY, shall be given any legal effect by this product or these materials.

This product has not been designed, tested, or intended for any use other than that for which it has been contracted for sale. This product is not warranted against injuries or damages of any kind caused by uses for which this product was not designed, tested, or intended.

Nothing contained herein is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent, and Asahi Kasei Corporation makes no representation or warranty, express or implied, that the use thereof will not infringe any patent.

IN NO EVENT SHALL ASAHI KASEI CORPORATION BE LIABLE FOR ANY ANTICIPATED OR LOST PROFITS, INCIDENTAL DAMAGES, CONSEQUENTIAL DAMAGES, COSTS, TIME CHARGES OR OTHER LOSSES, WHETHER BASED ON BREACH OF CONTRACT, TORTIOUS CONDUCT, OR ANY OTHER THEORY, INCURRED IN CONNECTION WITH THE PURCHASE OR USE OF THIS PRODUCT.

ASAHI KASEI CORPORATION DOES NOT AUTHORIZE ANYONE TO ASSUME FOR IT ANY LIABILITY OR TO MAKE ON ITS BEHALF ANY ADDITIONAL WARRANTIES IN CONNECTION WITH THESE MATERIALS.

Q&A

QWhat is the relationship between GF orientation and product design precautions?

A Glass fiber reinforced materials demonstrate glass fiber aligned in the direction of flow during molding. Due to the orientation of glass fibers in flow and crossflow directions, the molding shrinkage rate and strength are different. Care must be taken in designing products.

QWhat is actions for anti-warping?

A The warpage is generated by the size of the molding shrinkage rate of plastic materials and anisotropy (difference between the machine dirrection and the transverse dirrection). Generally, crystalline resins have a larger molding shrinkage rate and tend to cause warping, and glass fiber-reinforced resins tend to cause warping due to the degree of glass fibers orientation which occur at different degree in flow direction vs perpendicular to flow direction. Therefore, measures are taken to reduce the anisotropy of the molding shrinkage rate, by reducing the wall thickness change and also by improving the gate balance, etc., and also by increasing the molding temperature and the cooling time from the viewpoint of molding conditions. In terms of material, among the inorganic filler reinforcement types, the inorganic filler combination type with less anisotropy , spherical and plate-like morphologies is effective in preventing warpage.

QWhat is annealing and humidity control?

A Annealing refers to a heat treatment that is performed to stabilize dimensions or remove distortion after molding. Moisture control is a process for stabilize dimensions of hygroscopic material by forcibly moisture absorbed under a humidity atmosphere to and the like.

QHow to remove the mold deposit?

A Mold deposits (mold contaminants) are mainly composed of additives, monomers, oligomers, etc. contained in resins. In order to remove these mold deposit, it is common practice to wash them with a solvent that dissolves them well. Asahi Kasei's MD Buster™ and Buster Mild™ are effective.

QWhat is the rework material and the condition used?

A Rework materials (recycled materials) are materials that are used by crushing sprue, runners, and defective products generated in the process. Generally, the crushed product is used as it is, or the crushed product is converted to pellet by extrusion. When rework materials are used, precautions such as the storage condition before and after rework, the number of rework times, the ratio of rework materials used (how much is mixed), and contamination with foreign matter are required.

QWhat is the effect of discoloration during drying on physical properties?

A The color may change regardless of the material depending on the drying conditions (hot air or vacuum drying, temperature, and time). Generally, it is better to use the recommended temperature and within the recommended time, but even if it is at the recommended temperature, it may discolor if it dries for a long time. Discoloration does not affect the physical characteristics, but if it dries at a temperature higher than the recommended temperature for a long time the color could change drastically.

QHow is the relationship between mold shrinkage rate and molding temperature?

A The higher the mold temperature, the greater the molding shrinkage rate in general. Molding shrinkage of polyamide resin (LEONA™) and POM (TENAC™) of crystalline resin varies relatively greatly with mold temperature. The mold shrinkage ratio of mPPE (XYRON™) of the amorphous resin changes relatively small depending on the mold temperature.

QHow is the relationship between molding conditions and crystallization?

A The crystallized state of the product molded at the recommended mold temperature where the crystalline resin is sufficiently melted above the melting point is recommended. If the mold temperature is extremely low, crystallization may not be sufficient and the original properties of the resin may not be obtained.

QWhat is the maximum thickness of the product and the minimum thickness?

A In order to avoid stress concentration, sink marks on the product and avoid molding troubles, it is recommended to design product with as uniform wall thickness as possible. Nominal wall thickness recommended for injection molding part is between 1-3mm.

QIs pre-drying necessary?

A Pre-drying prior to molding can prevent resin hydrolysis and defects on the surface of molded products (such as silver streaks) mainly by removing moisture. Therefore, it is necessary to perform preliminary drying for stable molding.

QWhat is the shape of GF?

A GF is an abbreviation for Glass Fiber. The shape is 5-15 μm in diameter. The length of GF in the pellet glassfiber-reinforced plastic varies depending on the conditions at which it is mixed into the plastic, and is generally a few millimeters.

QHow to read the grade numbers?

A Please contact our sales staff as it differs for each resin (TENAC™, LEONA™, XYRON™).

QWhat is the masterbatch?

A For example, a colored masterbatch is made by blending a pigment into a resin at a high concentration, and it is possible to color molding parts by blending it into a natural colored resin at the time of molding. Thus, the masterbatch is a resin pellet that contains a high concentration of a specific additive in the resin.

QWhat is the difference between crystalline and amorphous resins?

A Crystalline resins are resins that exhibit an orderly arrangement of macromolecules. Amorphous resins do not have an order or specific arrangement of molecules. In crystalline resins, all of the macromolecules do not become crystalline, and the crystalline state and the amorphous state are mixed together. Specifically, crystalline resins include polyamide, polyacetal, and etc., and amorphous resins include polyphenylene ether, polycarbonate, and etc.. In general, crystalline resins are hard, rigid, and amorphous resins are characterized by excellent impact resistance and transparency.

QWhat is the difference between high and low viscosity grades?

A Polymers change their properties depending on their molecular weight. The higher the molecular weight, the higher the viscosity when melted (high viscosity), and the lower the molding fluidity. However, in terms of physical properties, the toughness and fatigue properties become better with higher molecular weight. The lower the molecular weight, the lower the viscosity at melting (low viscosity), and the better the molding fluidity. However, the physical properties tend to be brittle.

QWhat is the lublicity grade?

A This grade is made by blending lubricants, etc. to improve sliding characteristics and friction and wear resistance characteristics.

QWhat kind of inorganic fillers are there?

A There are various fillers according to chemical composition, such as oxides such as silica, hydroxides such as calcium hydroxide, carbonates such as calcium carbonate, sulfates such as barium sulfate, and silicates such as talc, mica, and warastonite. There are also needle-like fillers like wollastonite in shape, plate-like fillers like talc and mica, and spherical and granular fillers like calcium carbonate.

QWhat is the difference between homopolymer and copolymer of POM?

A In any polymerization, a polymer obtained by polymerizing only one kind of monomer is called a homopolymer, and a polymer obtained by polymerizing two 2 or more kinds of monomers is called a copolymer. In the case of polyacetals (POMs), polymers polymerized with only monomeric "formaldehyde" are homopolymers. Polymers obtained by polymerizing formaldehyde and other monomers are copolymers. The characteristic differences between POM homopolymers and POM copolymers are generally that homopolymers have excellent mechanical properties and copolymers have excellent resistance to heat, water, etc.

QWhat is UL?

A UL is an American agencies and standards set up to address product safety testing to prevent electricity and fire incidents. Formally known as Underwriters Laboratories Inc, and Standards, there are certifications for synthetic resin materials, and the following five are related to synthetic resins.

1. UL-94: Combustion test for plastic materials: Depending on the thickness of the test piece, there is 94HB, 94V-2, 94V-1, 94V-0, and generally the thinner the wall thickness, the more easily it burns.

2. UL-746A: The following two are used in the specification for short-term physical property assessment of plastic materials: In the case of a thermoplastic resin, it is applied in a use environment in which a dynamic external force is applied, and is determined by a tensile impact value (Izod value in the case of a thermosetting resin).The labeling method is applied in a use environment in which only "Mech,with imp static" external force is applied, and in the case of a thermoplastic resin, it is determined by a tensile strength (bending strength in the case of a thermosetting resin), and the labeling method is "Mech,w/o imp"

3. UL-746B: The following are used in the specification for long-term physical property assessment of plastic materials: Rated temperature Indicates a constant temperature at which the initial physical properties (e.g., electrical and mechanical properties) drop to 50% when exposed to air at a constant temperature for 0.1 million hours. Indicates RTIs (Relative Thermal Index) at °C.

4. UL-746C: UL-ranked by the rating level in the standard for evaluating the electrical use of plastic materials. (PCL:Performance Level Categories) uses the following five.
(1) Hot-wire ignitability: The degree to which the material is heated and ignited is evaluated in the number of seconds of ignition, and the indication is in five levels from 0 to 5 in the HWI (Hot-Wire Ignition) PCL-rank. The smaller the number, the better.
(2) Large current arc ignitability: The degree to which the material ignites by arc discharge is evaluated by arc number, and the indication of HAI (High-Ampare Arc Resistance) PCL rank is better as the number is smaller in 5 stages from 0 to 4.
(3) Arc Resistance: The degree to which a conductive path is formed, attributed to arcs according to ASTM D495, is evaluated in seconds, the indicia are shown as D495, and the PCL rank is 8 steps from 0 to 7, and the smaller the number, the better.
(4) High-voltage tracking: Repeated high-voltage, low-current arcing on the surface of the material, evaluating the degree to which the material can cause a conductive path, evaluating at the tracking speed (millimeters/minute), labeling is HVTR(High Voltage Arc Tracking Rate.
(5) Tracking Resistance: Evaluate the degree of voltage that causes the material to create a permanent carbonized conductivity path, the indication is CTI (Comparative Tracking Index), the PCL-rank is six steps from 0 to 5, the smaller the number, the better.

5. UL-746D: Standards for plastic-material assemblies

QWhat is the difference of weather and light resistant?

A Weather resistance indicates resistance to weather conditions (environmental gases such as sunlight, rain, air temperature, humidity, NOX, SOX, etc., dust, etc.), and light resistance indicates resistance to only light (sunlight, fluorescent lamps, etc.).