25 Shore A High Tear Strength 1:1 Mix Ratio Platinum Cure Silicone Rubber for

Hanast HN-E625 is a 25 +/- 2 Shore A high tear addition-cure (platinum-catalysed) liquid silicone rubber for gypsum molds, culture stone molds, wall tile molds, floor 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 25 Shore A softness picks up fine grout lines, stone grain and ornament detail, while 24 kN/m tear strength and 520 % elongation - the highest tear and elongation in the HN-E6XX range - strip deep undercuts, thin tile edges and intricate craft shapes 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, floor 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.
• Highest Tear 24 kN/m in the Series - matched with 520 % elongation and 6.0 MPa tensile strength, the grade survives repeated demolding of deep undercuts, split-face texture and thin floor tile edges.
• 25 Shore A Softness for Fine Detail - soft enough to release filigree, wood grain, stone texture and craft ornament, yet strong enough for daily production cycles.
• Low Viscosity 4500 ± 500 mPa·s - pours and degasses quickly, reproducing grout lines, brick texture and fine relief 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 fine detail gypsum, culture stone, wall tile, floor tile and craft molds; HN-E630 and HN-E635 for standard tile and general cement components; HN-E640 to HN-E650 for deep relief, thick pavers, concrete blocks and high-wear production molds. 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.
• Floor tile and paving molds - floor tile, ceramic tile, cement floor tile, terrazzo floor tile, paving slab, patio stone, tactile paving, stepping stone and floor brick 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 food contact molds - rapid prototyping, vacuum bagging, shoe insole, printing pad, plus chocolate, candy, fondant, gummy, ice cube 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 undercuts, stone grain and fine relief.
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 and floor tile manufacturers, cement component producers, craft mold makers and composite processors worldwide.