Products
Brush-On Silicone Rubber
R-1328 A/ R-1300TH B Tin RTV (Condensation Cure) Silicone rubber designed for Brush-On Mold Applications. This thixotropic (chemical thickener) catalyst produces high strength, long lasting rubber molds. Molds are built up by adding 2-4 coats, in 45minute increments, til a desired mold thickness is achieved (minimum 3/8 inch). Molds are usually completed within a few hours, depending on size.
Physical Properties of the Unvulcanized material:
Color: Off-white/ red
Viscosity @ 25C mixed : Thick creamy paste
Shelf Life: 6 months in a closed container
Typical Properties of Cured Rubber
Specific Gravity: 1.08
Hardness: 25 Shore A
Tensile Strength: 425 psi
Elongation at Break : 350 %
Tear Resistance: 80
**Gel Time: 35 min (Please pre-test if using different Base—A side of system)
Method of Use:
R-1328 A is processed by adding the curing agent R-1300 TH B. The addition of 10% catalyst (by weight) has a pot life of 35 minutes and is ready for de-molding after 15 to 24 hours. R-1300 TH B has thixotropic & pigment for good dispersion and should be shaken each time before mixing. First coat is applied thin to capture detail—use light air pressure from hair dryer to relieve surface bubbles. Remainder of coatings can be mixed and applied 45 – 60 minutes later. A mold can be completed within two hours of work time. Mixtures can be mixed and de-aired prior to use and allowed to age (which builds viscosity) for subsequent layers. Do not apply print/detail coat and let stand over night to cure--mold rubber should be applied in successive layers over several hours. Mother Molds can be applied next day after rubber bladder has completely cured. The addition of Rapid set (fast set additive) can speed this process to 1 hour, but will shorten mold storage life.
Available Catalysts:
Pour Mold catalysts: R-1328 B for over night cure—Hardness 25 A shore
R-1324 B for 6-8 cure time and 40min gel—Hardness 30 A shore
The information and data contained herein are based on information we believe reliable. Each user of the material should thoroughly test any application and independently conclude satisfactory performance before commercializing. Suggestions of uses should not be taken as inducements to infringe on any particular patent.