Engineered for manufacturing environments and rapid prototyping labs, this high-temperature resistant silicone putty bridges the gap between fast in-field mold making and industrial-grade tooling. It is a two-part, kneadable RTV system that cures into a rigid yet flexible silicone capable of withstanding intermittent exposure to temperatures up to 300°C, making it suitable for casting low-melt metals, reproducing foundry patterns, and creating short-run injection mold inserts.
The putty is formulated with a heat-stable filler package that maintains structural integrity and dimensional accuracy across thermal cycles. In use, the base and catalyst components are mixed by hand to a uniform color, then pressed or jigged onto the master pattern. Its putty-like consistency prevents slumping on vertical or overhead surfaces, allowing the user to build thickness precisely where needed. Working time is approximately six minutes at 23°C, providing enough time to fully cover complex shapes, and the putty fully cures in about thirty minutes without the need for an oven.
Post-cure, the mold exhibits a Shore A hardness of 40–50 and excellent resistance to thermal expansion mismatch, so metal casts cool without warping the cavity. The surface is hard enough to be machined, drilled, or sanded, which is invaluable when modifying a prototype mold after initial testing. The cured silicone also resists common industrial fluids and mild solvents, extending its service life in workshop conditions.
This silicone putty is an excellent companion for engineers and designers who need to create functional silicone tools without investing in full CNC or injection mold setups. It can be used to duplicate damaged parts for reverse engineering, form sealing gaskets on the fly, or build temporary fixtures for assembly operations. Its ability to go from raw putty to a heat-resistant tool in under an hour makes it indispensable for reducing downtime in production and prototype shops.
