liquid rubber silicone for concrete artificial stone casting

1.Description of liquid silicon mold making rubber silicone for concrete artificial stone casting

C-835 Silicone rubber is condensation cure silicone rubber for mold making. The silicone rubber will be cured under room temperature, It’s two-components, the mixing ratio is 100:2 . Part A is a flowable liquid silicone , part B is the catalyst. It has an exceptional fluidity and good operability. 

2.Characteristics of liquid silicon mold making rubber silicone for concrete artificial stone casting

· High dimensional stability over time

· Easy to use

· Most stable polymers available, offering superior reliability

· Vulcanization time can be adjusted, allowing flexible application

· Suited to polyurethane casting materials

· Excellent durability over time

· Excellent stability over time

· Zero shrinkage

· Mixing ease

· Increased production speed

*The working time and setting time depends significantly on the temperature and air-humidity. They also vary depending on the size of the cured item.

3.Application of liquid silicon mold making rubber silicone for concrete artificial stone casting

GC Silicone offers a full range of silicone rubber, room temperature vulcanized (RTV2) materials, for model and mold making. RTV2 silicone rubber is ideal for use in mold making applications including: rapid prototyping, jewelry, glass art, art sculpture, and concrete molding.

4.Datesheet of liquid silicon mold making rubber silicone for concrete artificial stone casting

5. Using instructions of liquid silicon mold making rubber silicone for concrete artificial stone casting

Step 1: prepare and clean the prototype.
You must make sure your original molds perfect. fix the original mold on a board , then using some assistant material(like cardpaper) to make a frame for to surround the prototype. The frame is no need ,if we make the mold by brushing way .

 Step 2: Take the silicone and catalyst as the ratio 100:2 (silicone:catalyst=100:2) ,mix the silicone rubber and catalyst evenly.
*Notes: Molding silicon rubber is a kind of flowing liquid and it contains two parts. Part A is a kind of flowing liquid and part B is the curing agent. Remember to mix part A and part B evenly, otherwise the silicon rubber will be partly solidified and this will bring troubles for your final operation. What’s more, the finished molds will have a short life. All of these will cause a waste of silicon rubber.

Step 3: Vacuum pumping

After mixed the silicone evenly, it is better to release the bubble by Vacuum pumping.

Step 4: Pouring cast or brushing cast

After released the bubble, we can pour/brush the silicone rubber on the prototype
*Notes:Please finished all the steped within the operation time .If not it will cause cross linking reaction, and no more further steps will be available.So,we have to pay attention to the pot life and curing time.

Video of how to make molds with our liquid silicone rubber:

https://www.youtube.com/watch?v=7Vjm2ygijnk

https://www.youtube.com/watch?v=QZGeZpjNccw

https://www.youtube.com/watch?v=P0mBMS0pmWM

Package
25KG/drum vacuum packing for part A +1kg/ bottle catalyst for part B

200KG/drum packing for part A +1kg/ bottle catalyst for part B

Shelf life

1. Twelve(12) months when stored under dry and cool place by original package under 25℃

Various color is available

FAQ:

1. Why will the silicone mold be reused only for a few times?

It can be due to the following reasons:

a. Adding too much silicone oil in to silicon rubber. Silicon oil is an additive which can destroy the molecular weight of silicone rubber and reduce the tension and tear strength.

b. Using the silicon rubber with a high hardness to make molds for small sized products with delicate and intricate designs or the silicon rubber with a low hardness to makes molds for large sized products with simple designs.

(Notes: we should choose the silicon rubber specifically according to the requirements of our products to avoid this problem.)

2. Why does the silicone mold appear to dry outside but wet inside?

Because molding silicone rubber is a kind of condensation silicone rubber, which get solidified after absorbing moisture from the air. In order to provide a significant shelf-life for the silicon rubber, we will dry out the water in the silicon rubber.

Solution: Add 0.1% water into the silicon rubber and Stir over a low speed briefly when you use it.

3. Why is the silicon mold oily?

The molding silicone rubber itself doesn’t contain any oil, so it won’t be oily. If the mold is oily, it may be because you add the compound silicone oil( the compound of silicon oil and white oil). The white oil is not silicon oil but a kind of petrochemicals.

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