condensation rtv2 silicone for mold making gypsum board
Product Description
1.Description of condensation mold making rtv2 silicones for gypsum board
C825 Silicone rubber is condensation cure silicone rubber for mold making. The silicone rubber will becured under room temperature, It’s twocomponents, the mixing ratio is 100:2 . Part A is aflowable liquid silicone , part B is the catalyst. It has an exceptional fluidity and good operability
2.Characteristics of condensation mold making rtv2 silicones for gypsum board
*An exceptional fluidity and good operability, easy to demold
*Good tensile strength and tear strength
*Soft hardness
*Copy detailed pattern
*Good flexibility
*Eco-friendly
*Long shelf-time &lifetime
3.Application of condensation mold making rtv2 silicones for gypsum board
C825 silicone rubber is perfect molding material., it is suitable to make mold for concrete stone, cement casting , gypsum decocations, plaster product, resin craft, soap,candle, bronze casting,
wax, crystal, tyre mold , shoe mold ,clay casting ,soap mold,ceramic casting ,etc..
C825 Silicone rubber is mainly suitable for small or middle sized product with delicate pattern by pouring operation.
4.Datesheet of condensation mold making rtv2 silicones for gypsum board
Item No. |
Appearance |
Hardness (shore A°) |
Viscosity (CPS) |
Tensile-strength( kgf /cm2 ) |
Tear-strength (kgf /cm2 ) |
Elongation-break(%) |
Mixing ratio |
operation time (25 ℃ ) |
Curing time( 25 ℃) |
shrinkage |
C825 |
White |
25±1 |
20000±1000 |
≥41 |
≥22 |
≥450 |
100:3 |
20-30 mins |
2~3 h |
≤0.3% |
5. Using instructions of condensation mold making rtv2 silicones for gypsum board
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.