Alfa Chemistry is equipped with advanced equipment and professional material chemists to provide you with vertical burning testing services, including the samples you send for testing or the samples of flame retardant materials developed in cooperation with us.
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Test Content
Vertical burning refers to the test method for measuring the time and burning state of the flame burning and flameless burning of the sample in the way that the sample of the specified size and shape clamped at the upper end is in a vertical position and the free end is exposed to the specified gas flame.
Test Range
The vertical burning test is suitable for plastics, foams, films, textiles, coatings, rubber, etc., but not for construction materials.
Optional Items and Standards
| Test Items | Test Standards | Sample Size | Sample Number |
|---|
Vertical burning
(20 mm flame) | UL94 for classifying materials V-0, V-1 or V-2 | 125×13×(0.025~13) mm | 20pcs |
Vertical burning
(Soft thin material, 20 mm flame) | UL94 for Classifying Materials VTM-0, VTM-1 or VTM-2. | 200×50 mm
Thickness < 0.25 mm | 20pcs |
Vertical burning
(125 mm flame) | UL94 for Classifying Materials 5VA or 5VB | Bar specimens:
125×13 mm, Thickness ≤ 13 mm;
Plaque specimens:
150×150 mm, Thickness ≤ 13 mm | 20 (Bar specimens)
12 (Plaque specimens) |
Device Schematic Diagram and Rating Criteria
- UL94 for classifying materials V-0, V-1 or V-2
| Rating Criteria | V-0 | V-1 | V-2 |
|---|
| The flame burning time (t1 or t2) of each sample | ≤ 10 s | ≤ 30 s | ≤ 30 s |
| For any setting condition, the sum of the flaming burning time of each group of 5 samples (t1+t2) | ≤ 50 s | ≤ 250 s | ≤ 250 s |
| The flame and flameless burning time (t2+t3) of each sample after the second flame application | ≤ 30 s | ≤ 60 s | ≤ 60 s |
| Flame or flameless combustion spreads to the fixture | No | No | No |
| Cotton indicator ignited by flaming particles or drops | No | No | Yes |
- UL94 for Classifying Materials VTM-0, VTM-1 or VTM-2.
| Rating Criteria | VTM-0 | VTM-1 | VTM-2 |
|---|
| The flame burning time (t1 or t2) of each sample | ≤ 10 s | ≤ 30 s | ≤ 30 s |
| For any setting condition, the sum of the flaming burning time of each group of 5 samples (t1+t2) | ≤ 50 s | ≤ 250 s | ≤ 250 s |
| The flame and flameless burning time (t2+t3) of each sample after the second flame application | ≤ 30 s | ≤ 60 s | ≤ 60 s |
| Flame or flameless combustion spreads to the fixture | No | No | No |
| Cotton indicator ignited by flaming particles or drops | No | No | Yes |
- UL94 for Classifying Materials 5VA or 5VB
| Rating Criteria | 5VA | 5VB |
|---|
| Flame burning plus flameless burning time (t1+t2) of each sample after 5 flame applications | ≤ 60 s | ≤ 60 s |
| Cotton indicator ignited by flaming particles or drops | No | No |
| Burn through of plaque specimens | No | Yes |
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