IDENTIFICATION OF RUBBER
IDEN TIFICATION OF RUBBERS S. No . Identification process Description Remarks PRELIMINARY EXAMINATION 1 Appearance Raw polymer Physical form may be lumps, sheet, granules Compounded stock Powder, Paste, Milled sheet A finished article Any finished product like Gasket 2 Method of Fabrication Moulded, Extrusion, Calendered, Casting To examine the flash, flash line, other process marks 3 Rigidity Flexibility To identify for thermo plastics, rubbers both can be usually cut cleanly with a sharp knife 4 Effect of heat A small piece (of about 0.1 gm) of the material is placed on a spatula and warmed very gently over a small Bunsen flame so that decomposition does not occur and the effects on the sample is noted