UL 94 testing for plastic flammability rating
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When is testing needed?
Flame-retardant plastics are required in several industries where materials are likely to encounter high levels of thermal stress or where the spread of fire would cause a serious safety hazard. Some examples of applications where fire resistance is paramount include construction materials, plane and car interiors, and insulators and casings in electronic products.
UL 94 testing plays a key role in ensuring and demonstrating that plastic materials used in such applications fulfill strict, internationally recognized fire safety criteria.
UL 94 flammability ratings
Plastic parts and materials can be categorized into twelve classes based on the type of material and the results of UL 94 flammability tests. The following six classes (in ascending order of flame-retardancy) apply to solid and cellular plastics:
HB
V2
V1
V0
5VB
5VA
Foamed plastics can be classified as HBF, HF-2, and HF-1, while the last three classes (VTM-2, VTM-1, and VTM-0) apply to thin films unable to support themselves in a horizontal position.
Questions?
Fire testing expert Kimmo Kaukanen is happy to help.
Our UL 94 testing solutions
Measurlabs offers the following UL 94 tests for assessing the flammability characteristics of plastic materials:
Horizontal burning test for HB classification.
Vertical burning test with a 50 W flame for V2, V1, and V0 classification.
Vertical burning test with a 500 W flame for 5VB and 5VA classification. The material should already be classified as V1 or V0 before testing is conducted.
Horizontal burning test for foamed plastics for classification in HBF, HF-2, and HF-1.
We also offer a range of other fire testing services, including IMO FTP code tests for materials used on ships and EN 45545-2 tests for railway materials. Do not hesitate to contact us to discuss your company’s testing needs.
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