UL 94 VTM Rating: VTM-0, VTM-1 and VTM-2 ‐ Thin Material Vertical Burning Testing This test method is used for thin specimens or materials that: are too flexible, and; may distort, shrink, or flex. This occurs during the traditional vertical testing. Failure to pass the UL 94 V test is a precondition of all VTM ratings.

Printed circuit board with the mark "94V-0" in the bottom-left corner. UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. [1]

This method is used to determine the UL 94 VTM-0, VTM-1 and VTM-2 flammability ratings of thin materials. Failure to pass the UL 94 V test is a precondition of all VTM ratings. The test evaluates both the burning and afterglow times and dripping of the burning test specimen.

Aug 14, 2009 · When choosing a fireproof bag to protect important documents from fire and water damage, look for certifications like UL94 VTM-0 or UL72 for fire resistance. Also, consider independent testing from reputable organizations like SGS.

Sep 25, 2024 · UL94 V and UL94 VTM ratings differ in test setup and sample type. Both assess flammability, with V-0 being ideal, as it avoids dripping and extinguishes flames quickly.

A flame rating of VTM-0 cannot be considered equivalent to a V-0 rating as the test methods are quite different. Likewise, VTM-1 and VTM-2 cannot be considered equivalent to V-1 and V-2 respectively.

V-0: After two 10-second burning tests are performed on the specimen, the flame is extinguished within 10 seconds. Testing Methods. UL94 flammability test includes the following 4 methods: 1. Horizontal burning test for UL94 HB rated materials; 2. Vertical burning test for UL94 V-0, V-1, and V-2 rated materials; 3.

Mar 23, 2020 · Whether to do the V classification flammability test or VTM flammability test can be selected according to the material characteristic when thickness is in the range of 0.025-0.25mm. VTM-2, VTM-1, VTM-0 flammability rating can be analogously considered to correspond to V2, V1, V0 in the flammability classification of thin films.

V-0: After two 10-second combustion tests on the sample, afterflame & afterflame extinguished within 30 seconds. Dripping particles must not ignite cotton. 5VB: After five 5-second combustion tests on the sample, afterflame & afterflame extinguished within 60 seconds.

Flame retardant materials are becoming a critical component in modern circuitry as designers implement safeguards to ensure that fire will not spread in the case of ignition. This test can be performed on either conformal coatings or plastics used in electronics.