Translucent Addition Cure Soft Lost Wax Molds Making RTV2 Liquid
Silicone Rubber
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 A 5~55 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.
Features
Convenient to operate because the RTV property
Easy to mix due to the low viscosity (7000~9000Cps)
High duplication because of high tear and tensile strength
Long shelf life with low shrinkage
Can be accelerated for rapid cure
Applications
1.A range of materials can be cast into the cured silicone mold:
polyurethane and other reactive resins
Small pieces of cement,plaster,concrete products.
Food like chocolate,fondants
Wax,candle,soap;
Low melt metal
2.casting body parts,shoe insole,cloth label,texture coating.
Technical Properties
| Item No. | MCPLA-L10A/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) | 10 |
| 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 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:
1.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.
2.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
When the silicone rubber is stored at or below 25 degree Celsius in
the original unopened containers, Silicone Base and Curing agent
have a usable life of 12 months from the date of production. After
12 months’ stockpiles, please use tool to stir the Part A silicone
for some minutes, then the silicone can be use again, no influence
for other performance.
1.Store the original packing tightly sealed and at a temperature
below 25 degree Celsius.Use the product as soon as the packaging
has been opened.
2.Close the lid tightly after taking out the proper amount of
liquid silicone rubber.
Use the product as soon as the packaging has been opened.
