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2.4.3. Burning test
|
PA 6.6 and |
PES |
PE |
PP |
PVC |
Saran |
PVA(A) |
|
Melts and then burns with light flame.White smoke, Drops of yellowish melting drip down |
Melts and burns with light flame. Sooty, blackish smoke, drops of melting drip down. |
Shrinks, curls, melts and burns with light flame. Drops of melting drop down |
Shrinks, melts and burns with light flame, drops of melting drip down |
Shrinks rapidly and melts does not burn, sooty,melts into a crumbling, black substance |
Melts and burns with light flame. |
Shrinks, curls and burns very rapidly with light flame. |
|
Stops burning if melting drops fall down. Small bead on the end of the sample. Hot melting bead may be stretched into fine thread |
Stops burning if melting drops fall down. Small black bead on the end of the sample. Hot melting bead may be stretched into fine thread |
Continues to burn rapidly. Hot melting substance cannot be stretched |
Continues to burn rapidly. Hot melting substance may be stretched into fine thread |
Hot melting substance cannot be stretched. |
Stops burning immediately. Hot melting substance may be stretched into fine thread |
Continues to burn rapidly. Melting substance cannot be stretched |
Residue |
Hard, round, yellowish bead; not crushable |
Hard blackish bead; not crushable |
No melting bead; like paraffin; crushable |
Hard, round brown to blackish; not crushable |
Hard, blackish, crumbly irregular; no bead |
Porous, blackish irregular substance; crushable; no bead |
Hard, brown to black, irregular; not crushable |
Smell of the smoke |
Celery-like; fishy odour; faintly like pyridine. |
Oily, soot odour; faintly sweet; similar to scaling-wax; aromatic |
Similar to burning asphalt; like wax or paraffin |
Similar to burning asphalt; like wax or paraffin. |
Sharp, sweet; sweetish-sourish |
Sharp, acrid |
Sharp,sweet like chlorine. |
Table shows the reactions to the burning test of the different synthetic fibres by which they can be identified. However, in practice the differences are not always so clear as shown in the table. For an accurate identification it is necessary to verify the results of the burning test by the solubility test and/or the melting point test.