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out this item Jay Enterprises LSR-140 is little harder than LSR-135 and it is mainly used for making molds for the Jewellery and food grade applications . It also can be used for making compontents and molds for concrete stone,GRC,polyurethane products ; wax, candle decoration ; rapid prototyping Its food & Jewellery grade Two-part silicon rubber: flowable addition cure silicon Medium Fast curing. Cures at room temperature within 5-8 hours.Degassing is required An exceptional fluidity and good operability, easy to demold. Good tensile and tear strength, no shrinkage.