Garreco 6801505 SILAFORM 90 X-HARD BLUE A&B (2x1.5 KG)Product Overview Silaform silicone putty is a one to one mix material that is excellent for a variety of procedures. Silaform 90 (blue) has a Shore A hardness of 90 while Silaform 70 (purple) is more flexible and has a Shore A hardness of 70. Both materials resist deformation and abrasion normally associated with silicone putty. The absence of expansion and contraction offers endless possibilities for this economically priced product from Garreco.