UL standard

What is UL Standard?

It is an American organization established by the Fire Insurance Industry Association, which creates and certifies functional and safety standards for materials, parts, and equipment.
Passing these tests allows use of the UL Certification Mark.

What is UL94?

It is a standard for combustibility of plastic materials (an established standard of a US private testing organization), and the ranking for self-extinguishing materials is divided into 5VA, 5VB, V-0, V-1, V-2, and HB.
5VA is the most flame retardant, 5VB → V-0 → V-1 → V-2 → HB.

UL94 V-0 to V-2 criteria

(20mm vertical burning test (IEC60695-11-10 B method, ASTM D3801))
A test piece (125±5×13±0.5×t mm) was mounted vertically on a clamp, two 10-second indirect flames were applied with a 20 mm flame, and V-0, V-1, V-2, Not judgment is made.

Criterion	Flammability classification V-0	Flammability classification V-1	Flammability classification V-2
Burning time for each specimen	10 seconds or less	30 seconds or less	30 seconds or less
Total burning time for 5 pieces	50 seconds or less	250 seconds or less	250 seconds or less
Burning + glowing time for each specimen	30 seconds or less	60 seconds or less	60 seconds or less
Burn up to clamp	None	None	None
Ignition of cotton by droplets	None	None	Available

UL94 HB acceptance criteria

[Horizontal burning test (IEC60695-11-10 A method, ASTM D635)]
A test piece (125±5×13±0.5×t mm) is held horizontally, a 20-mm flame is applied for 30 seconds, and the burning rate is judged by the 75-mm mark distance.

Specimen thickness	Burning speed
3 mm or more	40 mm/mm or less
less than 3mm	75 mm/mm or less

*) Even if it self-extinguishes in front of the 1st and 2nd marked lines, the test is passed.

*) Passing a thickness of 3.0 (-0.0, +0.2) mm will automatically allow HB for a thickness of 1.5 to 13.0 mm.

*) If tested and passed at a thickness of less than 3.0mm, HB certification is granted from the passed thickness to 2.99mm.

Directives and standards

Related information

REACH regulation

This is a regulation for chemical substance management that came into force on June 1, 2007 in the EU.

RoHS Directive (European RoHS Directive)

Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment, amended by Directive 2011/65/EU of the European Parliament and Council dated June 8, 2011 and is now called RoHS2.

HS code

"HS Code" is a code number established based on the "International Convention on Harmonized Commodity Description and Coding System (HS Convention)".

China RoHS Directive (Management Measures for Prevention of Pollution in Electronic Information Products Production)

This is a Chinese regulation regarding the restriction on the use of certain hazardous substances in electronic and electrical equipment.

CE standard

CE marking is a mark that indicates that a device or product complies with the essential requirements of all EC directives.