Table 4. Application of Soxhlet Extraction for Rubber Composites.

Rubber	Solvent	Extracted Substance	Reference
Elastomer	acetone	BHT, Cyanox 2246, Antioxidant OMB, Cyanox 425, OTBG, DPG, DOTG, TPG	86, 87
	acetone and ammonia	mercapto group	86
SBR	acetonitrile	HPPD, OBTS, TMQ, processing oil, paraffin wax	75, 85
	acetone	HPPD, TMQ, DODPA, paraffine oil, t-octylphenol/formaldehyde resin	75, 85
IIR	chloroform	alkane, palmitic acid, stearic acid, BHT, DIBP	73
	toluene	toluene, xylene, bibenzyl, diphenylethylene	73

Cyanox 2246: 2,2’-methylenebis(4-methyl-6-tert-butylphenol), Antioxidant OMB: 2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl-phenol, Cyanox 425: 2,2’-methylenebis(4-ethyl-6-tert-butylphenol), OTBG: orthotolybiguanidine, DPG: diphenylguanidine, DOTG: diorthotolyguanidine, TPG: triphenylguanidine, OBTS: N-oxydiethylene-2-benzothiazylsulfenamide, DODPA: di-(t-octyl)-diphenylamine, DIBP: diisobutyl phthalate