The sample, in a refractory thimble, is extracted with hot toluene until the residue reaches constant weight. The weight of residue is calculated as a percentage of the sample.

Comprises a tinned copper condenser coil, alumina thimble of porous grade and an Erlenmeyer flask of one litre capacity.

Size (HxWxD): 20 x 13 x 13cm
Weight: 1.5kg