Residual chemicals in silicone rubber products for food contact use
2001
Kawamura, Y. (National Inst. of Hygienic Sciences, Tokyo (Japan)) | Nakajima, A. | Mutsuga, M. | Yamada, T. | Maitani, T.
The residues of additives and other chemicals in 23 kinds of silicone rubber products for food contact use, including nipples, packing and spatulas, were investigated by GC/MS. The packing and spatulas contained 80 - 480 micro g/g of BHT, 60 - 5,830 micro g/g of di(2-ethylhexyl) phthalate (DEHP), and 60 - 80 micro g/g of dibutyl phthalate, while the nipples contained no additives. All of the samples contained 15 to 20 peaks of polydimethylcyclosiloxanes. Dodecamethylcyclohexasiloxane (D6) to tetratriacomethylcycloheptadecasiloxane (D17) were confirmed, and other larger siloxanes up to pentacontamethylcyclopentacosasiloxane (D25) were estimated. A rough estimate of the total cyclosiloxane content was 3,310 - 14,690 micro g/g. They might be mainly unreacted materials or by-products, and some of them might be additives. Based on the migration test, no chemicals were released into 20% ethanol at 60 deg C for 30min, though DEHP and the polydimethylcyclosiloxanes were released into N-heptane at 25 deg C for 60 min.
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