Addition Cure (Platinum)
Addition cure silicones, also known as platinum cure silicones, have without doubt the longest lifespan of all the silicones available. They also have minimal to zero shrinkage so are ideal when accuracy of casting is required weeks or months later. They are great for mould making for a variety of materials and industries, from epoxies, polyesters, plaster, and also low melting metals where heat tolerance is required. Industries are equally varied from rapid prototyping or SFX applications, where a skin-safe silicone is needed for life-casting. While good for making molds for casting a variety of materials, platinums also have application and physical properties that other rubbers do not. As a result, they are used for other applications. For example, some are certified “skin safe” and can be applied directly to human skin. They are also used for making prosthetic and orthotic devices, skin safe appliances and effects, etc. Some are certified “food safe” for culinary applications.
DC-A20 is a kind of two part silicone rubber in addition cure or platinum cure type with mixing ratio of 1:1.It can cure at room temperature as well as under heat. It’s a kind of skin safe and food grade.And mainly used for mold making.
DC-A20 silicone Rubber is mainly used for making molds of concrete stone, GRC, polyurethane products ; wax, candle decoration; rapid prototyping and tire molds; chocolate, candy and similar products’ molding.
Technical Parameters
Model | Color | Mixing ratio (%) | Pot life (mins, under 25℃) | Curing time | Hardness ( Shore A ) | Tensile- strength (MPa) | Tear- strength (kN/m) | Viscosity （After A/B mixed ,mPa.s） | Shrinkage rate (%) | Elongation （%） |
DC-A20 | Translucent and adjustable | 1:1 | 30-40 | (3-5hrs under 25℃); (20-30 mins under 60℃) | 20±2 | >7 | >26 | 3500±1500 | <0.1% | > 600% |
Characteristics
＊An exceptional fluidity and good operability, easy to demold
＊Aging resistance, high temperature resistance (220℃-300℃)
＊Environmentally, food-grade, FDA Certification.
＊Good tensile and tear strength
＊Outstanding bubble releasing
＊Very Low shrinkage
＊Non-deformation
Operation Instructions
Step 1: prepare the original molds
Prepare an perfect original mold and clean it totally before operation.
＊Notes: Make sure your original molds and operation tool were cleaned up totally to avoid uncured problem .
Step 2: Take 100 G part A and 100 G part B and mix them evenly.
＊Notes: Addition cure mold making silicon rubber is two parts flowing liquid, Pls follow the step strictly:
1.Weigh the two part exactly by electronic weight. If any part not in exactly weight, it may cause changing of hardness, or even cause uncured problem.
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 silicone rubber.
Step 3: Pouring casting operation
＊Notes:1. 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.We suggest to set the silicone mold for another 12 hours after demould before you put it into a large production .
Warm Tips:
As addition cure silicone is a kind of platinum cure system, which will be easy to cause uncured problem ,so pls kindly follow the tips as below :
＊Do not mix with liquid condensation silicone rubber or even the tool which used for condensation silicone rubber.
＊Do not mix with organic matter which contains N, S, P organics and ionic compound like Sn, As,Hg, Ph. (Do not smoke when you use this addition silicone rubber)
＊Do not add any pigment or powder into the addition cure silicone rubber without any testing to prevent uncured problem.
Package:
1. 1:1 mix ratio: 20KG;25KG and 200KG Per drum
Shelf life:
Twelve(12) months when stored under dry and cool place by original package under 25℃
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