Hello all! I'm trying to identify an unknown elastic band. I need to know if it is silicone-based or rubber (carbon) based. Here are my experimental parameters:

Dynamic headspace: incubate 12 mins at 80 C flow 50 ml/min

The trap is TenaxTA held at 50 C

Thermal desorption: starting at 40 C going to 280 C for 3 min, CIS starting from -10 C to 280 C

GC: DB-5 column, flow 1 ml/min, over 40 to 250 held for 10 mins

I am not seeing any siloxane peaks from my sample (I do see some siloxane peaks from the Tenax tube and fittings). All I'm seeing are long-chain saturated and unsaturated carbon compounds. No silicon-based compound. I am currently concluding that my sample is carbon-based rubber and not silicone.

Am I on the right track?