Liquid Platinum Silicone Rubber RTV2 For Jewelry Molds 25 Shore A
Product description
MCPLA-L25 is a kind of food grade silicone rubber, which is also named addition silicone rubber and platinum silicone rubber.MCPLA-L25 liquid platinum silicone rubber is generally a type of two parts liquid silicone rubber vulcanized under room temperature. The silicone components are delivered as liquids, which once mixed and cured transform into a translucent, elastic and resistant material. Polymerization occurs without formation of heat.
Applications
1. A range of materials can be cast into the cured silicone mold:
Polyurethane, Epoxy resin and other reactive resins
Small pieces of cement,plaster,gypsum,concrete products.
Food like chocolate,fondants,desserts
Wax,candle,soap;
Low melt metal
2. Life casting,casting body parts,prosthetics.
Processing and Instructions of Addition Cure Silicones
1. Mixing the two components
According the mixing ration 10:1 or 1:1 weighting A and B, the two components may be thoroughly mixed either by hand or using a low-speed electric to minimize the degassing of bubbles and to avoid any temperature increase. Note: It is also possible to use a special mixing and dispensing machine for the silicone components, further information is available upon request.
2. Moulding
The mixture should be degassed preferably at 30 to 50 mbar to eliminate any entrapped air. If a dispensing machine is used, the two components are degassed separately prior to mixing. The silicone mixture expands to 3-4 times of its initial volume and bubbles rise to the surface. The bubbles progressively disappear and the mixture returns to its initial volume after 5 to 10 minutes. Wait a few minutes to complete the degassing and then flash the vacuum. The silicone is ready for pouring, either by gravity or under low pressure.
Note: Flashing the vacuum once or twice accelerates the degassing. It is recommended to use a container with a high diameter/height ratio (3 to 4 times of the initial volume)
3. Polymerisation
The curing may be slowed down at lower temperature or accelerated by applying heat.
Note:
Contamination from sulfur (e.g., sulfur-based clay), amines, tin compounds, cured polyester resin, some paints and some silicone rubbers may inhibit surface cure of platinum-cured rubbers.
Apply a release agent, Although not usually necessary, a release agent will make demolding easier when casting into most surfaces.
Packaging
20kg per drum, 200kg per drum
Storage and shelf life
MC Silicone MCPLA -L Series should be used within 12 months from the manufacturing date.
1.Store the original packing tightly sealed and at a temperature below 30 degree Celsius.
2.Use the product as soon as the packaging has been opened.
Technical Properties
| Item No. | MCPLA-L25A/B |
| Appearance | Viscous liquid |
| Color | Translucent |
| Viscosity ( cps,approx.) | 7000-9000 |
| Mix ratio (A:B) | 1:1 |
| Working time(at 25℃ ,minutes) | 30-40 |
| Curing time(at 25℃,hrs,approx.) | 4~6 |
| Hardness Shore A(after 24 h) | 25 |
| Tensile Strength(Mpa,after 24 h) | 3.8 |
| Elongation(%) | 600 |
| Tear Strength(N/mm) | 16 |
| Linear Shrinkage (%) | 0.1
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