10:1 Mix Ratio RTV2 Liquid Addition Cure Molding Silicone Rubber
For Crafts Molds
Product description of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
MC Silicone MCPLA-H40 is a two-component elastomeric material
consisting of Silicone Base, which when mixed with Curing
Agent,cures to an elastic and resistant material at room
temperature by an addition reaction. The curing can be heat
accelerated. A range of materials can be cast into the cured
silicone mold.
Features of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
High Transparency
Good flowability
High tear and tensile strength
Long shelf life with low shrinkage
Fast mixing (10:1)
Flexible and dimensional stability
Applications of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
Label manufacturing, hearing aid earmold, molding applications
requiring low shrinkage e.g., jewelry, automotive. It can be used
to make exceptionally strong and tear resistant molds for casting
wax, resins and other materials, etc.
Technical Properties of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
| 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) | 3.8 |
| Elongation(%) | 400 |
| Tear Strength(N/mm) | 17 |
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 of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
Part A: 20kg per drum, Part B: 1kg per bottle
Special containers are available are on request.
Storage and shelf life of 10:1 RTV2 liquid addition cure molding silicone rubber for
crafts molds
MC Silicone has a usable life of 12 months from the date of
production with the original package stored at a temperature below
25°C. Use the product as soon as the packaging has been opened.
