Elastomeric casting materials

SILMARK is a gray-colored silicone rubber casting material. With the high concentration of pigments in the material, even the strong lighting under a microscope cannot penetrate and reflect from particles beneath the surface of the cast, and optimum sharpness of the microscopic image is thus guaranteed. The gray color has the advantage of providing an excellent contrast when photographing and digitally storing the casted toolmarks.

SILMARK is available in two viscosities: low and medium. The medium viscosity material is meant for use at the scene of the crime, where marks are often found on vertical surfaces. The low viscosity variant is for making test impressions in the lab (usually on an horizontal surface), where it will flow easily into the smallest details.

For the curing of the silicon rubber a paste hardener is used. The paste hardener is conveniently measured and mixed.

Cat. No. C-1000
SILMARK, low viscosity, 150 g in tube, with paste hardener

Cat. No. C-1100
SILMARK, medium viscosity, 150 g in tube, with paste hardener

Cat. No. C-7200
Paste hardener for SILMARK, 20 g in tube

To lower the viscosity of all SILMARK casting materials (including white and black), a small amount of diluant (up to about 20%) can be added and mixed in before adding the hardener. The curing time consequently will be longer and the rubber obtained will be less strong.

Cat. No. C-4000
SILMARK diluant in 10 ml glass drop-bottle

Cat. No. C-5000
SILMARK diluant in 100 ml polyethylene bottle