Design and materials Sintec Laboratory is supplied with seat and backrest shells made from shockproof and break-proof polypropylene as standard, which makes it particularly easy to clean. The seat and backrest upholstery is really quick and easy to replace. The chair features an epoxy-resin coated, five-legged base frame with flat lines made from sectional steel tubing. The colour of the frame is basalt grey. Sintec Laboratory can be supplied with Stamskin Top synthetic leather or with integral foam upholstery.