UL 94 V Rating: V-0, V-1, V-2

This test measures the self-extinguishing time of the vertically oriented polymer specimen. The top of the test specimen is clamped to a stand and the burner is placed directly below the specimen. The test evaluates both the burning and afterglow times and dripping of the burning test specimen.

 

The material will be rated:

V-0: if flame extinguishes within 10 seconds with no dripping

V1: if flame extinguishes within 30 seconds with no dripping

V2: if flame extinguishes within 10 seconds with dripping

 

UL 94 VTM Rating: VTM-0, VTM-1 and VTM-2 - Thin Material Vertical Burning Testing

This test method is used for thin specimen or materials that are too flexible or may distort, shrink or flex during the traditional vertical testing (failure to pass the UL 94 V test is a precondition of all VTM ratings). This test is similar to the vertical burning test except that the material is wrapped around a mandrel before clamping to the stand and the flame application is reduced. In this test, the flame is applied only for 3 seconds.

 

UL 94 5V Rating: 5V, 5VA, 5VB - Vertical Testing is done on both bar and plaque specimens

For any material to achieve 5V classification, the test specimens must not burn with flaming and/or glowing combustion for more than 60 sec after the fifth flame. Also, the test specimens must not drip.