Flammability
Chemical FOR: Insulation $2,970Flammability is perhaps one of the most common and most important tests performed on aerospace wiring. This is why every modern wire/cable type has some requirement for flammability assessment. In general, a length of the wire/cable under test is placed in a draft-free chamber and hung free over a high-temperature flame for 30 seconds - 15 minutes (specification dependent). A piece of tissue paper is placed under the sample to catch falling debris. The sample is considered failed (again specification dependent) if one or more of the following conditions has occurred:
- The burn length on the sample has exceeded a specified length
- The sample continues to burn for more than three seconds (specification dependent) after the flame has been removed
- The tissue paper under the sample had ignited due to failing debris from the sample
Please note that because there are so many methods, each requiring different physical configurations, sample preparations, etc., the price for the particular test method may vary. Please contact Lectromec directly for pricing of your particular flammability test needs.
See also: Resistance to Flame Propagation
Procedure
- Visually examine the specimen and record any damage or defects.
- Precondition the specimen according to the particular test method.
- Place specimen in draft free enclosure and affix to test jig such that the specimen is under constant tension.
- Place a piece of tissue paper under the specimen to catch falling debris.
- Place calibrated flame on sample and maintain location of flame for the specified duration.
- Record the duration the specimen remains on fire after the flame has been removed.
- Report burn length, duration specimen retained fire after flame was removed, and if debris from specimen caused ignition of tissue paper.
Covered specifications
- AITM Method 2.0005
- ANSI -NEMA WC27500 Method 4.3.19
- AS22759 Method 5.7.10
- AS23053 Rev A Method 4.14
- AS4373 Method 801
- AS5382 Method 5.6.1
- AS6070 Method 5.5.1
- AS654 Method 5.3.12
- AS81044 Method 4.7.5.18
- AS85485 Method 4.7.13
- ASTM D2671 Method 68
- ASTM D876 Method 17-21
- ASTM D3032 Method 18
- EN3475 Method 407
- FAR 25.853 Appendix F, Part I, Section a.3
- FED-STD-228 Method 5221
- MIL-DTL-25038 Method 4.6.10
- MIL-DTL-32554 Method 4.6.9
- MIL-DTL-32630 Method 4.7.6
- MIL-DTL-81381 4.6.4.16
- MIL-W-81822 Method 4.6.26
- AS4373 Method 812
- BMS 1352 Method 8.6
- EN3844 Method 1
- ESLU5T-1A263-AA Method 6.06
- FMVSS 302 Method TP-302-03
- JES292 Method 25
- MIL-DTL-49055G Method 4.7.9
- UL224 Method 5.11