When mold geometry includes deep undercuts, razor-thin sections, or repetitive flexing, standard silicone rubbers can fail prematurely. This high-tear-strength tin-cure formulation is engineered to withstand the mechanical abuse of demanding production cycles, delivering significantly longer mold life without compromising the demolding ease that silicones are famous for.
The defining characteristic of this two-part condensation-cure rubber is its exceptional tear resistance, rated well above typical general-purpose grades. Paired with an elongation at break that exceeds 500%, the material can stretch dramatically around protruding features and then recover its original shape without permanent deformation or crack initiation. This elasticity makes it the preferred choice for casting abrasive polyurethane resins, high-density concrete, and complex architectural ornaments that would quickly destroy a weaker mold.
Despite its robust cured properties, the liquid system remains practical to handle. Its slightly thixotropic nature allows the silicone to cling to vertical surfaces during brush application yet still level out when poured into a containment box. The pot life is extended to about 40 minutes at 23°C, giving users enough time to build up thick, reinforced mold jackets layer by layer. Room-temperature demolding is achievable in 8 to 10 hours, and an optional mild heat post-cure can further stabilize the rubber’s physical properties and eliminate residual surface tack.
This silicone adheres well to itself, enabling multi-part mold assemblies without the use of additional adhesives, provided the initial layer is not fully cured before the next is applied. It is compatible with a broad range of casting media, including epoxy, gypsum, liquid plastics, and low-melt metal alloys, and its neutral-cure chemistry ensures it does not inhibit the surface curing of polyurethanes. Mold makers servicing the soap, candle, garden statuary, and foundry pattern industries will find this material delivers the durability and reproduction quality needed for profitable small-series production.
