How to read the UL Yellow Card
Item description
Registration number
E48285; LEONA™, TENAC™
E82268; XYRON™
Material Designation (Mtl.Dsg): grade name
Color (Col): color tone
ALL: All colors NC: Natural color BK: Black RD: Red WT: White
Minimum Thickness(Min.Thk.): Minimum thickness
Unit: mm
Flame Class: Combustion class
5-VA, 5-VB, V-0, V-1, V-2, HB
Relative Thermal Index (RTI): Temperature index
Unit: °C
A measure of long heat resistance resin
In terms of electrical properties (Elec), mechanical properties (Mech), impact strength (Imp) and tensile strength (Str),
The temperature at which its initial value is halved after 100,000 hours of aging.
Hot Wire Ignition (HWI): Hot wire ignition resistance
A nichrome wire is wound around the test piece, and the nichrome wire is energized so as to consume 65 W of power,
Measure the time (seconds) until ignition.
- PLCs
- 0: 120 seconds or more
- 1: 60-119 seconds
- 2: 30-59 seconds
- 3: 15-29 seconds
- 4: 7-14 seconds
- 5: less than 7 seconds
High Ampere Arc Resistance (HAI): High current arc ignition resistance
Move the movable electrode between the fixed and movable electrodes, discharge at a rate of 40 times/min, and measure the number of times until ignition occurs.
- PLCs
- 0: 120 times or more
- 1: 60-119 times
- 2: 30-59 times
- 3: 15-29 times
- 4: 7-14 seconds
- 4: Less than 15 times
High Voltage Arc Tracking Rate (HVTR): High Voltage Arc Tracking Rate
A large voltage and a small current are applied at intervals of 3.97 mm to cause discharge between the electrodes.
This interval is gradually extended, and when the arc stops flying, the original interval is restored.
This is continued for 2 minutes, and the value obtained by dividing the length of the track trace by 2 minutes.
- PLCs
- 0: 0 to 10mm/min
- 1: 10.1 to 25.4mm/min
- 2: 25.5 to 80mm/min
- 3: 80.1 to 150mm/min
- 4: 150mm/min or more
D495: Arc resistance test
A discharge current of 10 mA was applied between the electrodes facing each other at a distance of 6.25 mm. ) is measured.
- PLCs
- 0: 420 seconds or longer
- 1:360-419 seconds
- 2: 300-359 seconds
- 3: 240-299 seconds
- 4: 180-239 seconds
- 5: 120-179 seconds
- 6: 60-119 seconds
- 7: less than 60 seconds
Comparative Tracking Index (CTI): Comparative Tracking Index
Apply a voltage of 100 to 600 V, drop 50 drops of 0.1% ammonium chloride aqueous solution from the drop port at a rate of once every 30 seconds, and measure the voltage (V) when surface destruction occurs.
- PLCs
- 0: 600V or more
- 1: 400-599V
- 2: 250-399V
- 3: 175-249V
- 4: 100-174V
- 5: Less than 100V
PLCs
HWI, HAI, HVTR, D495 and CTI are displayed in the grade of Performance Level Categories (PLC).
