RTV-2 platinum-cured 1:1 addition-type liquid silicone rubber

In the field of mold making, RTV-2 platinum-cured 1:1 addition-type liquid silicone rubber has become an ideal material for making high-precision, high-quality molds due to its unique properties.The platinum catalytic system ensures no bubbles, low shrinkage (<0.1%), and resistance to gypsum alkaline corrosion (pH 10-12), and the mold life is up to 500+ castings. It is suitable for scenes with extremely high precision requirements such as complex reliefs and cultural relics restoration.

1. Core advantages: Why choose platinum LSR to make gypsum craft molds?

(1) Nano-level detail reproduction capability
It can accurately capture the fine texture of 0.05mm on the gypsum master mold (such as sculpture folds, hair, inscriptions), far exceeding the traditional sulfurized silicone (which can only reproduce ≥0.2mm details).

(2)Zero-corrosive safe contact 

The platinum catalytic system has no acidic by-products, which prevents the surface of the gypsum master mold from powdering (the pH value of traditional silicone is 3-5, and long-term contact will damage the gypsum)

(3) Ultra-long service life and economy
It can withstand ≥800 demolding cycles (ASTM D624 test), with a strength retention rate of ＞90%, and the cost per use is 62% lower than that of ordinary silicone.

(4) Operation-friendly
It can be initially cured in 30 minutes at room temperature and demolded in 2 hours (condensation silicone requires 24 hours), supporting rapid small-batch production.

General parameters

2. Typical application scenarios and process matching
(1)Restoration and reproduction of cultural relics
Application:

 Museum plaster cultural relics re-molding (such as Buddha statues, inscriptions)
Technology points:
Use Shore A 10-15 ultra-soft silicone to avoid pulling fragile plaster during demolding;
Add 3% silicone oil to reduce viscosity and ensure that it penetrates into the cracks of cultural relics to replicate the internal structure.

(2)Mass production of art sculptures
Application:

plaster decorative ornaments, architectural relief molds
Process optimization:
Layered casting technology: first pour a 5mm thin layer to cover the details, and then pour a thick layer to enhance support;
Built-in glass fiber mesh cloth to improve the tear resistance of the mold (can withstand 10 times/day of plaster slurry casting).

3. Cultural and creative product development
Application: plaster aromatherapy candle mold, plaster painting DIY kit
Innovative design:
Modular silicone mold (with positioning pins) to achieve multi-component combination molding;
Built-in temperature sensor to monitor the exothermic process of plaster curing (to prevent silicone deformation).

3.Main feature :

1. Environmentally friendly, non-toxic, tasteless, non-corrosive, passed FDA food grade, MSDS, ROSH and other certifications.

2. Low viscosity, good fluidity, convenient operation and easy pouring; it can be cured at room temperature or heated.

3. Excellent physiological inertia, waterproof, ozone resistance and aging resistance, high tensile toughness, and many mold turning times.

4. High chemical stability, high and low temperature resistance, can be used for a long time and maintain its performance at -55°C to 220°C.

5. No low molecules are released during the cross-linking process, so the volume remains unchanged, the shrinkage rate is as low as 0.1%, and the precision is high.

4.Mold making process of RTV-2 platinum-cured 1:1 addition-type liquid silicone rubber
(1) Prototype preparation
Clean and process the mold prototype to ensure that the surface is smooth and free of impurities.
(2) Mixing and degassing
Mix components A and B in a 1:1 ratio, stir evenly and vacuum degas to avoid bubbles affecting the quality of the mold.
(3) Pouring and curing
Slowly pour the mixed silicone rubber onto the prototype to ensure that the details are completely covered.
Cure at room temperature or under heating conditions, usually for a few hours to a day.
(4) Demolding and post-processing
After curing, carefully demold and check the integrity and accuracy of the mold.
Surface treatment or secondary curing can be performed as needed.

5.Packing and shipping:
10Kg/set (A component 5Kg +B component 5Kg)
40Kg/set (A component 20Kg +B component 20Kg)
50Kg/set (A component 25Kg +B component 25Kg)

Packed in iron drum or plastic drum, transported as non-dangerous goods, sealed at room temperature 25°C, and protected from acid and alkali impurities, the storage period is 12 months.

6.Precautions :

1. Do a small amount of testing before use, and then put it into use.

2. Do not add color or powder to the silica gel at will before testing. Do not contact with water, acid, alkali or other organic matter containing sulfur, phosphorus and nitrogen, so as not to affect the curing of silica gel.

3. This product is a platinum catalyst silica gel, which cannot be in contact with condensation type silica gel. Before using the silica gel, tools and containers need to be cleaned with thinner water.

         4. If you need to color, please add the color paste to component B by 2/1000, and stir evenly.