Moldmaking Platinum Cure Silicone Rubber For The Best Reproduction Molds Of Rapid Prototyped Part
Product description
Platinum cure silicone rubber also known as addition cureRTV silicone rubber. In a platinum-based silicone cure system, also called an addition system (because the key reaction-building polymer is an addition reaction), a hydride- and a vinyl-functional siloxane polymer react in the presence of a platinum complex catalyst, creating an ethyl bridge between the two.The reaction has no byproducts. Such silicone rubbers cure quickly, though the rate of or even ability to cure is easily inhibited in the presence of elemental tin, sulfur, and many amine compounds.
Features
High Transparency
High tear and tensile strength
Long shelf life with low shrinkage
Fast mixing (10:1)
Easy processing due to the low viscosity
Applications
Label manufacturing, Molding applications requiring low shrinkage e.g. toys, jewelry, automotive, rapid prototyping etc.
Technical Properties
| Item No. | MCPLA-H40A | MCPLA-H40B |
| Appearance | Viscous liquid | liquid |
| Color | Transparent | clear |
| Viscosity(at 25℃ ,mPa.s,approx.) | 45000-50000 |
| Specific Gravity(g/cm3,approx.) | 1.08 |
| Proportion(A:B) | 10:1 |
| Max working time(at 25℃ ,minutes) | 60 |
| Demoulding time(at 25,hrs,approx.) | 24 |
| Hardness Shore A(after 24 h) | 40 |
| Tensile Strength(Mpa,after 24 h) | 5.8 |
| Elongation(%) | 350 |
| Tear Strength(N/mm) | 27 |
Processing and Instructions
1. Mixing the two components
According the mixing ration 10:1 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: in general contact with certain materials can inhibit the cross linking of RTV.
Natural rubbers vulcanized with sulfur
RTV silicone compound catalyzed with metal salts, e.g. Tin compounds
PVC stabilized with tin salts and additives
Epoxy catalyzed with amines
Certain organic solvents, e.g. Ketones, alcohols, etc.
In case of doubt, it is recommended to test the substrate by applying a small quantity of the mixed silicone on a restricted area.
Packaging
Part A: 20kg per drum, Part B: 1kg per bottle
Special containers are available are on request.
Storage and shelf life
MC Silicone MCPLA -H Series should be used within 12 months from the manufacturing date. Beyond this date, MC silicone no longer guarantees the products confirms with the sales Specification. In order to preserve best properties it is recommended to follow strictly the following guild lines:
Store the original packing tightly sealed and at a temperature below 30 degree Celsius.
Use the product as soon as the packaging has been opened.
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