RTV-2 Tin Cure Silicone Rubber for Gypsum Casting Cornice Moulds Making

Description of RTV-2 tin cure silicone rubber for gypsum casting cornice moulds making

DC-C25 RTV-2 Mold Making Silicone Rubber is a kind of room temperature vulcanized silicone rubber in condensation type. It’s generally named as two part silicone rubber, Part A is a flowable liquid silicone, Part B is the curing agent (Tin catalyst) . It’s mainly used for mold making.

Typical Applications of RTV-2 tin cure silicone rubber for gypsum casting cornice moulds making

DC-C25 RTV-2 Mold Making Silicone Rubber is used for making molds of concrete stone, GRC, gypsum decoration, plaster ornaments, fiberglass products, polyester decoration, unsaturated resin crafts, polyresin crafts, polyurethane, bronze, wax, candle, and similar products.

Technical Parameters of RTV-2 tin cure silicone rubber for gypsum casting cornice moulds making

SHELF LIFE:

12 months when stored under 25°C in original unopened packages.

25KG/drum vacuum packing for part A +1kg/ bottle catalyst for part B;9/18drums/pallet;

200KG/drum packing for part A +1kg/ bottle catalyst for part B; 1//2/4drums/pallet;

Techinical Support

Normally, different silicone should be choosed according to different product's features,for example :

- For products size (within 20cm), 
with intricate disigns, soft silicone is suitable, such as 10-20 shore A.

- For products size (20cm-80cm), 
with intricate designs, 20-25 shore A is suitable. 
with simple designs, 25-30 shore A is suitable.

- For products size (80cm-150cm), 
with intricate designs, 25 shore A is suitable.
with simple designs, 30-35 shore A is suitable.

- For products size (more than 150cm), 
with intricate designs, 25-28 shore a A is suitable.
with simple designs, 35-40 shore A is suitable. 

*Good operability, easy to demold

*Moderate hardness

*High tensile and tear strength

*Cure at room temperature

*Good flexibility

*High duplication times  

 Operation instruction

Step 1: prepare the original molds

Make your original molds perfect fix it on a board. And fix the original mold on a board , then used four piece of board to enclose the original molds.

Step 2: Take 100 G parts A and add 2G parts B and mix them evenly.

Notes: Mold making silicon rubber is a kind of flowing liquid ,it contains two parts. Part A is a kind of flowing white liquid and part B is the curing agent or catalyst .Pls follow the step strictly:

         1.Weigh the two part exactly by electronic weight. If not, for example add too much catalyst , the operation time will be too fast to operate ,which will cause inconvenience to operate .

         2.Mix part A and part B evenly. Otherwise the silicon rubber will be partly solidified and this will give birth to difficulties in your final operation. What’s more, the finished molds will meet a short life. All of these will cause a waste of silicon rubber.

Step 3:Vacuum pumping

Without exception, this step takes less than 10 minutes.Otherwise,it will cause cross linking reaction,

and no more further steps will be available.

Step 4: Pouring casting or Brush operation

*Notes:1. For simple pattern products we suggest use pouring operation way, which will be very easy to operate and demould. Pourable silicone require low viscosity which will be easy to flow smoothly and easy to de-air .

        2.For delicate pattern products we suggest use brushing operation way, which can copy the pattern exactly . Brushable silicone require high viscosity which won’t be easy to flow away and easy to brush .  

        3. We sugges to set the silicone mold for another 12 hours after demould before you put it into a large production .