R PRO 20 (4 kg /141,10 oz) Silicone Rubber for Silicone Medium Hardness Moulds,Silicone Mould Making kit for DIY, 100% Safe,high Tear Resistance,1:1 Mix Ratio

✔️FEATURES: R PRO 20 is a 1:1 addition-cure liquid silicone rubber with high tear resistance. Suitable for modeling and mold making, this versatile silicone is ideal for creating medium-hardness molds (20 Shore) that reproduce even the smallest details and undercuts. ✔️HIGH PERFORMANCE: R PRO 20 silicone for molds faithfully reproduces fine details, allows up to 20% more castings compared to other silicones, and molds have no linear shrinkage. It is a very fluid rubber that ensures easy mixing and does not require vacuum degassing. ✔️HARDNESS: Once cured, this silicone produces soft molds (20 Shore A hardness) that are highly elastic and resistant to tearing. Working time: 45 minutes - Curing time: 3 hours. ✔️MOLD PERFORMANCE: The physical lifespan of the mold depends on its use (casting materials, frequency, etc.). Casting abrasive materials such as concrete can quickly wear out mold details, while non-abrasive materials (such as wax) preserve them. ✔️NOTE: Sulfur-based plasticine is NOT compatible and may inhibit the curing of R PRO silicones.