Model NO.: C-825 and C-830
Hardness: 25, 30 Shore A
Mixing Ratio: 100:2
Application: Making molds for resin/plaster sculpture, art sculpture, buddha, statues etc.
Keyword: mold making silicone rubber, silicone rubber for sculpture molds, silicone rubber for foundry casting
1.Description
silicone mold rubbers can also be used for wax, plaster and concrete casting, but are most beneficial for high volume resin or foam casting. Release agents are generally not needed for casting any of these materials, which is why they are sometimes preferred over polyurethanes. For resin sculptures that need to be painted after casting, silicone mold rubbers are recommended.
The popular silicone for these fields is C-825/C-830, medium hardness, tin-cured silicone rubber with a 100A:3B mix ratio (digital scale required for measuring) and 3-4hour demold time. Can easily be thickened with Liquid Thickener for brush-on application.
2. Technical Datasheet
| Typical general characteristics | Inspection Method | Value | |
| Product data (Catalyzed A+B) | C-825 | C-830 | |
| Hardness | Shore A | 25±2 | 30±2 |
| Mix Ratio | A:B | 100:3 | 100:3 |
| Color | / | White | White |
| Pot life | 25 °C (77F) | 30-40mins | 30-40mins |
| Curing time | 25 °C (77F) | 3-4 hours | 3-4 hours |
| Mixed viscosity | mPa.s | 20000±1000 | 23000±1000 |
| Tear-strength | kg/cm | 22±2 | 23±2 |
| Tensile-strength | M.pa | 4.0±0.5 | 5.0±0.5 |
| Elongation | % | 450±50 | 460±50 |
| Shrinkage | % | ≤0.3 | ≤0.3 |
Note: This is a 100A:3B mix ratio product that must be measured by weight. The choosing of suitable hardness should be according to the size and pattern design of the products. If large products and therefore multiple-piece molds are needed by customers, silicone rubber with higher hardness will be required for the molds. Conversely, soft silicon is indispensable for molds with complicated pattern and delicate details. The amount of curing agent admixture depends on the actual need of customers. More will be added for speedy drying and fast release and less when otherwise.
4. FEATURES
1.No oily surface on the cured mold
2.Low viscosity
3.Extra low shrinkage
4.Pouring and brushable silicone
5.High tear strength
6.various color is available
7.Heat Resistance(up to 180 degrees)
8.High reproduction rate
5.SHELF LIFE:
When stored at or below 32°C (89.6°F) in the original unopened containers, C-8 series Silicone Base and its Curing Agents have a usable life of I0 months.
6.Package
Silicone base:1kg/drum; 20kg/drum;25kg/drum;200kg/drum.
Curing Agent: 30g/bottle; 1kg/bottle
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