Description of RTV2 Silicone Rubber for Moulding
RTV-2 is a two-component Room-Temperature-Vulcanizing (RTV-2)
silicone rubber. Depending on its curing mechanism, two types of
RTV-2 are available: "condensation" cure type and "addition" cure
type. In general, RTV-2 Silicone rubber is a two-component
material, and the silicone rubber includes Part A base silicone and
Part B CA30 curing agent. The Part A base silicone and Part B
curing agent can cure at room temperature by a condensation
reaction. These silicone materials can be cast into the cured
silicone mold: Plaster, polyurethane, PU, GRC, cement, resin,
polyester, wax etc...
Features of RTV2 Silicone Rubber for Moulding
1. Good flow ability and long working time
2. Medium hardness
3. High tear and tensile strength
4. Easy de-mould from complex replica parts
5. Acid and alkali-resistance
6. Low linear shrinkage
Applications of RTV2 Silicone Rubber for Moulding
RTV2 Silicone rubber series are suited for reproduction of cement
molding, concrete stones, artificial stones, plaster molding,
figures, art objects, decoration molding, GRC products, gypsum
products, resin products, PU molds. etc.
Instruction for making RTV-2 silicone rubber mold
1. Preparing
The surface of the original objects should be clean and free of
loose material. If your products have thin flower patterns, and
especially have porous substrates, please use a suitable mold
release agent such as soap water, detergent, Vaseline or petroleum
jelly.
2. Mixing
Please weigh Part A silicone base and part B CA30 Curing Agent with
ratio of 100: 2 into a clean container. Stir Part A base silicone
thoroughly before use, then Mix Part A and Part B evenly until the
curing agent completely dispersed in the silicone base. Manual or
mechanical mixture can be used, but do not last much time or allow
the temperature to exceed 35C (95F). It's suitable to mix small
quantities to ensure thorough mixture of silicone base and curing
agent.
Note: It is strongly recommended that entrapped air be removed in a
vacuum chamber, allowing the mixture to completely expand and then
collapse. After a further 1 to 2 minutes under vacuum, the mixture
should be inspected and can be used if free of air bubbles. A
volume increase of 3-5 times will occur on vacuum de-airing the
mixture. So a suitably large container should be chosen.
3. Pouring and curing
Pour the mixed Part A base silicone and CA-30 curing agent as soon
as possible onto the original object, avoiding air entrapment. The
catalyzed material will cure to a flexible rubber within 6 hours
(or faster by different mixing ratio or room temperature), we
advice you de-mold after 24 hours, it is will improve the replicate
times of silicone mold.
Storage of RTV2 Silicone Rubber for Moulding
When the silicone rubber is stored at or below 30C (85F) in the
original unopened containers, RTV2 Silicone Base and CA30 Curing
agent have a usable life of 12 months from the date of production.
After 12 months, please use a stirring mill to stir the Part A
silicone for some minutes, then the silicone can be use again,
without any influence to the characteristics.
Packing of RTV2 Silicone Rubber for Moulding
Part A base silicone: 20kg/drum, 25kg/drum or 200kg/drum
Part B CA30 Curing Agent: 0.25kg/bottle, 1kg/bottle and 10kg/bottle
Need more information, please feel free to contact Nicole.
| Item | MCSIL-H20 |
| Color | off-white |
| Curing agent | CA30 |
| Hardness | 20 Shore A |
| Tear Strength | 35 N/mm |
| Tensile Strength | 4.7 Mpa |
| Shrinkage | ≤0.3% |
| Elongation at break | 544% |
| Relative density | 1.1-1.15 g/cm3 |
25 Shore A High Tear Strength RTV2 Liquid Tin Cure Silicone Rubber For Molding Gypsum Decorations
