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Group Work - Molding and Casting
This week’s group assignment was to review the safety data sheets for each of the molding and casting materials at our lab, and then to make and compare test casts with each of them. In addition to the group activity, we had to individullay design a 3D mold and use it to cast parts.
Materials & Safety
The materials we have at our lab are Aditya 1010 RTV liquid silcone & Aditya Easy Cast Transparent Epoxy Resin -33.
ADITYA SILICONE RUBBER RTV – 1010
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Product link
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Data sheet
> ADITYA SILICONE RUBBER RTV – 1010 is a condensation cure type Silicone Rubber. It comes in 2 parts. One is Silicone Rubber and second is Curing Agent.
>Curing Agent is mixed into Silicone Rubber in a given ratio. (40-50 ml i 1kg of silicone)It cures at room temperature. Plaster, Resin, Epoxy Resin, Polyurethane, Wax and other resins can be casted into the cured silicone mould.
Features
> Specially created Silicone Rubber to make molds of Murties, Statues, Crafts, POP Cornices, Medallions and items which have deep under cuts.
> Low Viscosity
> Low hardness
> Easy demoulding
> Can be made paste to apply with brush also
Technical Properties
> Viscosity - .10000 Pi
> Curing Agent / Hardener Ratio 4 %
> Curing Time - 6 Hours
> Colour - Milky
Aditya Easy Cast Transparent Epoxy Resin - 33
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Product link
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Data Sheet
> Easy Cast Transparent Epoxy 33 can be casted into moulds of Silicone Rubber to Create Transparent Crafts, Lockets, Jewellery and Trophies. Pigments are available to make Opaque Colour Castings. It comes in Part A and Part B.
Features
> Transparent
> Low viscosity
> No grinding or sanding after casting
> Can Cure in 30 minutes if heated at 65 degree centigrade and poured
> Part A 100 parts : Part B 50 parts mixing ratio
> Non-Yellowing
Test Parts
Silicone
For epoxy the mixing ratio of the Silicone and the curing agent was mentioned on the pack. The ratio was 40-50ml in 1000ml of silicone i.e 4-5% of curing agent in measure amount of silicone.
First batch didn’t turn out perfect, we added about 5% of curing agent. The silicone set in about 3 minutes which is not ideal. For the next batch we decided to add a little less curing agent at about 4%.
For the second test 4% was used and it worked perfect. We used syringe to add curing agent to the silicone. This helps us to add the correct weight drop by drop.
Epoxy
Ratio for epoxy was also mentioned on the pack. The Proportion for Epoxy –> 2:1 i.e. for every 2 parts of Compound A we have to add 1 part of compound B.
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