BS 476-7返回 Back
Test item 测试名称: fire propagation 火焰传播
Refer products 涉及产品: 塑料, 塑胶, 木板...
Test limit 限量要求：
The results on the flame spread on the material surface should smaller than 165mm from the reference measuring point.
| Flame spread at 1½ minutes | Final flame spread | |||
| Classification | Limit | Tolerance for one specimen in sample | Limit | Tolerance for one specimen in sample |
| mm | mm | mm | mm | |
| Class 1 | 165 | 25 | 165 | 25 |
| Class 2 | 215 | 25 | 455 | 45 |
| Class 3 | 265 | 25 | 710 | 75 |
| Class 4 | Exceeding Class 3 limits | |||
Sample request 送样规格:
A minimum 9 test specimens shall be provided, and they shall be representative of the exposed surface of the product
885 mm X 270 mm X thickness (less than 50mm) x 9pcs
it is required to state the product normally used with/without an air gap behind it and the exposed face.
Lead time 测试周期：normal 10 working days
Others 其他信息:
1. Class 0 ( BS476-6 and BS476-7 )
Sample for reference 参考图片: 
The material must meet the requirement of Class 1 results to BS 476: Part 7
have a sub-index I1 ≤ 6 and a total index I ≤ 12 results to BS 476 Part 6
Sample for reference 参考图片:
Sample Report 报告样本：