RTV-2 platinum liquid silicone rubber for making gypsum concrete crafts sculpture resin mold with low shrinkage and high temperature resistance

Innovative Application and Technical Analysis of Platinum Curing Liquid Silicone Rubber (LSR)

in the Field of Architectural Decoration Moulds

1. Core features: Why is it the top choice for architectural molds?
(1) Ultra-high precision texture reproduction
The reproduction capability reaches 0.05mm level, perfectly presenting the natural weathering texture of cultural stones, the classical carvings of Roman columns and other complex details, far exceeding polyurethane molds (can only reproduce ≥0.3mm textures).
Case: In a European-style building project, the sandstone texture cultural bricks reproduced by LSR molds have a visual similarity of 98% with natural stones (tested by spectrophotometer).

(2) Adaptability to extreme environments
Temperature resistance: Stable performance in the range of -40°C~250°C, adapting to:
High temperature hydration reaction during concrete pouring (80°C);

(3) Low temperature construction environment in winter.
Chemical corrosion resistance: Resistant to cement alkalinity (pH 12-13), avoiding mold powdering and cracking.

(4) Ultra-long service life and economy
A single mold can complete more than 500 concrete pourings (ASTM D624 test), with a service life five times that of ordinary rubber molds and a 40% reduction in overall costs.

2.Typical application scenarios and technical solutions
(1) Mass production of cultural stone/antique bricks
Process optimization:
Use Shore A 30-40 hardness silicone to balance demoulding and wear resistance;
Built-in glass fiber mesh cloth to prevent deformation of large-size molds (such as 60×120cm).

(2) Production of Roman columns/decorative lines
Innovative design:
Modular split molds: Through mortise and tenon structure splicing, a 2-meter-high Roman column can be formed in one go;
Built-in temperature control system: accelerates concrete solidification and increases turnover rate to 2 times/day.

(3) Reproduction of GRC curtain wall components
Technical breakthroughs:
Vacuum-assisted pouring eliminates bubbles and ensures the integrity of ultra-thin components (10mm thick);
Surface spraying of nano-hydrophobic agent eliminates residues after demoulding.

General parameters

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.