40 Shore A High Tear 14 kN/m Platinum Cure Silicone Rubber with 1:1 Mix Ratio for Gypsum Culture Stone and Wall Tile Molds

Hanast HN-E640 is a 40 +/- 2 Shore A high tear addition-cure (platinum-catalysed) liquid silicone rubber for gypsum molds, culture stone molds, wall tile molds, cement component molds and craft molds. Components A and B are mixed 1:1 by weight and cure in 3-4 hours at room temperature or in 20 minutes or less at 80-100 °C. The 40 Shore A hardness keeps deep relief, sharp edges and fine grout lines stable under repeated casting, while 14 kN/m tear strength, 6.0 MPa tensile strength and 450 % elongation release undercuts, stone grain and thin decorative details without ripping. Linear shrinkage stays at 0.1 % or less, so pattern dimensions repeat across a full production run, and the cured rubber is certified to FDA, MSDS and RoHS with service from -50 °C to 200 °C.

• China Factory Direct Supply - Shenzhen / Guangdong manufacturer with a 40,000 square metre production base, supplying mold shops, distributors and importers direct without trading-company mark-up.
• OEM and ODM Private Label - custom hardness, viscosity, colour, pot life, drum label and packaging under the buyer's own brand for private label programs.
• Wholesale and Bulk Export - 10 / 20 / 25 kg drums and 20 / 40 / 50 kg kits, palletised export packing, non-dangerous goods classification for smooth customs clearance.
• FDA, MSDS and RoHS Compliance - certification and documentation supplied with every lot, so the same grade also serves food contact and skin contact molds.
• TDS Hardness and Viscosity Selection Guide - an eleven-grade table maps Shore A 0-50 to gypsum, culture stone, wall tile, cement component and craft applications, removing guesswork for buyers.
• Free Sample for Evaluation - a 1 kg trial kit supports hardness, tear and demolding tests before a bulk order is placed.
• Platinum Addition-Cure Supplier - 1:1 addition cure with no low-molecule release during crosslinking, giving dimensionally stable molds and clean demolding.
• High Tear 14 kN/m and 450 % Elongation - the highest tear class in the HN-E6XX range at 40 Shore A, built for deep relief culture stone, thin wall tile edges and intricate craft molds.
• 40 Shore A Firmness for Deep Detail - firm enough to hold pattern geometry and long production runs, yet flexible enough to strip undercuts and fine ornament without corner tearing.
• Low Viscosity 6000 ± 500 mPa·s - pours and degasses quickly, reproducing stone grain, brick texture, grout lines and filigree detail with fewer pinholes.
• Dual Curing Mode and Stable Supply - 3-4 h at 25 °C or 20 min or less at 80-100 °C, 30-40 min pot life, 50 tons per month capacity, 12 months shelf life unopened, TDS and MSDS per lot.

Grade selection: HN-E600 to HN-E610 for ultra-soft gel, life casting and silicone doll skin; HN-E615 to HN-E625 for thin wall tile, fine grout detail, jewellery and delicate crafts; HN-E630 and HN-E635 for standard wall tile, culture stone and general cement components; HN-E640 and HN-E645 for gypsum molds, deep relief culture stone, cement components and high-wear craft molds; HN-E650 for rigid block and heavy-duty formwork. All grades share the same 1:1 mix ratio, 30-40 min pot life and 3-4 h room-temperature cure.

• Gypsum and plaster molds - gypsum mold, plaster mold, gypsum wall panel, plaster cornice, ceiling rose, column capital, relief panel, statue and figurine mold, decorative plaster craft.
• Culture stone and artificial stone molds - culture stone, cultural stone, faux stone veneer, ledge stone, stacked stone, rock face, cobblestone, artificial stone, terrazzo and cast stone molds.
• Wall tile and wall panel molds - cement wall tile, split-face tile, 3D wall panel, wall cladding tile, decorative wall brick, interior feature wall and wall cap molds.
• Cement and concrete component molds - cement component, concrete element, paver, concrete block, GRC and GFRC casting, precast element, planter, balustrade and architectural concrete molds.
• Craft and art molds - craft mold, resin craft, epoxy casting, jewellery, candle, soap, photo frame, picture frame, ornament, life casting and wax molds.
• Prototyping and composites - rapid prototyping, vacuum bagging, shoe insole, printing pad and composite tooling molds.
• Food contact molds - chocolate, candy, fondant, gummy, ice cube, cake and baking molds.

1. Pre-mix: stir Components A and B separately until uniform before weighing.
2. Weighing: weigh A and B at exactly 1:1 by weight on a precision scale.
3. Mixing: mix for 2-3 minutes, scraping the container walls and bottom.
4. Degassing: vacuum degas to remove entrapped air and prevent pinholes on pattern faces.
5. Pouring: pour within the 30-40 min pot life and brush the first layer into deep relief, stone grain and undercuts.
6. Curing: cure 3-4 h at 25 °C or 20 min or less at 80-100 °C, then demold after full cure.

• Platinum addition-cure silicone may fail to cure in contact with organotin compounds, sulfur and polysulfide compounds, amines, polyurethane, phosphorus compounds, organic acids and solder flux residues.
• Keep substrates, tools and containers clean and free of these contaminants, and do not mix with condensation-cure (tin-cure) silicone residues.
• Do not add colourants or fillers before a small trial, because some additives disrupt catalyst activity.
• Use nitrile gloves, goggles and adequate ventilation. Store sealed below 25 °C away from acids, alkalis and direct sunlight.

• Components A and B: 10 kg / 20 kg / 25 kg iron or plastic drums; kits 20 kg / 40 kg / 50 kg per set.
• Store in original sealed containers below 25 °C in a cool, dry, ventilated area; shelf life 12 months unopened.
• Non-dangerous goods for transport; factory-direct OEM/ODM supply with TDS and MSDS documentation for every lot.
• Minimum order quantity 20 kg, 1 kg sample kit for evaluation, 50 tons per month supply capacity, 5-7 working days for stock and 10-15 days for bulk production.

Shenzhen Hanast New Materials Co., Ltd. manufactures industrial silicone materials at a 40,000 square metre production base in Guangdong, China, supplying platinum cure liquid silicone rubber to gypsum and plaster factories, culture stone and cast stone producers, wall tile and cement component manufacturers, craft mold makers and composite processors worldwide.