Soapstone Chalk Soapstone Chalk Soapstone chalk is a natural chalk used in the welding process. It is used to mark the surface to be worked on before welding. It is resistant to heat. It is temporary and leaves no trace. Details It is an ideal chalk for temporary marking during welding and manufacturing. The marking is visible through the welder’s mask. It is natural white soapstone, environmentally friendly and non-toxic. Dimensions 5x12x125 Rectangular Soapstone (100 PCS) 10x10x100 Square Soapstone (50 PCS) 10x5x100 Rectangular Soapstone (100 PCS) Ø6,4×127 Cylindrical Soapstone (100 PCS)