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Grc&gfrc Molding Silicone

1. Description

GRC/GFRC is a new kind of material used today for home decor items as well as ornamental moldings.

GC Silicone manufactures two-component, room temperature curing silicone mold materials that are used widely in the grc/gfrc casting industry to create highly detailed decorative parts.

GRC/GFRC can be cast repeatedly into silicone molds without release agents. The primary differences between polyurethanes and silicones are the cost (silicones are more expensive than polyurethane) and the range of hardness available within the product lines. For highly detailed and delicate castings, silicone rubbers may be necessary as they are available in softer and more flexible options compared to polyurethanes.

The popular silicone mold rubber is C-825/C-830 for these applications. A tin-cured silicone rubber with a 100A:3B mix ratio; measure with a digital scale.

2. Technical Datasheet

Typical general characteristics Inspection MethodValue
Product data (Catalyzed A+B)
HardnessShore A25±230±2
Mix RatioA:B100:3100:3
Pot life25 °C (77F)30-40mins30-40mins
Curing time25 °C (77F)3-4 hours3-4 hours
Mixed viscositymPa.s20000±100023000±1000

Note: 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.


1.Low viscosity

2.great flexibility

3.Extra low shrinkage

4.Chemical resistance

5.release properties

6.Easy to work with

4.High tear strength

5.Heat Resistance

6.various color is available

7.High reproduction rate


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.


Silicone base:1kg/drum; 20kg/drum;25kg/drum;200kg/drum.

Curing Agent: 30g/bottle; 1kg/bottle

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