Good Flowability High Strength Low Shrinkage RTV-2 Liquid Platinum
Cure Silicone Rubber For Making Cake Decorating Molds
Product description
Two-component addition type silicone rubber Silicone Rubber is a two-part, platinum-catalyzed, liquid silicone
system that cures (RTV) to a Shore A20 rubber. The polymerization can be accelerated by heat. The silicone
components are delivered as liquids, which once mixed and cured
transform into a transparent, elastic and resistant material.
Polymerization occurs without formation of heat.
Platinum cure silicone rubber, also called addition cure silicone,
are two-component high tear strength and flexible mold or casting
compounds. They are recommended as a mold material for casting
polyurethane, epoxy, or polyester resins, wax and a wide range of
other casting materials. They exhibit extremely low shrinkage and
high physical properties. These rubbers are chemically sensitive to
latex, sulfur, and certain other materials. Platinum cure silicone
can also be used to cast prosthetics for special effects makeup and
medical training devices.
Features
Two-part platinum-cured (addition-cure) silicone rubbers
Room temperature curing (RTV)
Shore Hardness Options: A10-A60
Do not exhibit shrinkage upon curing so they are useful for casting
dimensionally stable parts for highly accurate prototyping and
model making applications
Molds do not require release agents when casting most materials
Cured molds have a long library life
Pourable or brushable (thicken with thixo agent)
High-strength
Excellent chemical resistance
Reproduces fine details
Can be accelerated for rapid cure
Ideal for the most demanding resin casting applications
Applications
Label manufacturing, Molding applications requiring low shrinkage
e.g., jewelry, automotive, plaster, cement, cake decorations, etc.
Technical Properties
| Item No. | MCPLA-L20A/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.) | 6 |
| Hardness Shore A(after 24 h) | 20 |
| Tensile Strength(Mpa,after 24 h) | 3.8 |
| Elongation(%) | 600 |
| Tear Strength(N/mm) | 16 |
| Linear Shrinkage (%) | 0.1 |
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.
NOTE ON CURE INHIBITION: Sulfur/tin/amine-contaminated materials
and tools will cause cure inhibition in platinum-cured silicone
rubbers, which means that the rubber that is in contact with the
contaminated surface will remain gummy or uncured. Make sure to
test cure the rubber on your surface before full-scale application.
Use a polyurethane or tin-cured silicone rubber if you know that
you’ll be working with any of these inhibitors.
Packaging
20kg per drum, 200kg per drum
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.
