How to determine how much silicone needed for mold and how much resin needed to cast

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Moviepropmaker6

Active Member
Hey guys,just wanted to know how you are usually supposed to find out how much silicone you need for a mold and how much resin you need for a cast
 

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Hazmat

Well-Known Member
Re: How to determine how much silicone needed for mold and how much resin needed to c

Not sure if this will help but an easy way to find an objects volume is to place the object in a container filled with water. The amount of water it displaces will be equal in volume to the object. So if youhad a mold made for an action figure (lets say) and wanted to know how much resin to duplicate it, you could fill a pot with water to the brim. Put that in a larger pot or basin, put the action figure in the pot full of water and the amonut of water that pours over the edge into the larger container has an equal volume to the action figure. Pour that into a measuring cup and you can see how much resin you need.
 

Moviepropmaker6

Active Member
Re: How to determine how much silicone needed for mold and how much resin needed to c

Not sure if this will help but an easy way to find an objects volume is to place the object in a container filled with water. The amount of water it displaces will be equal in volume to the object. So if youhad a mold made for an action figure (lets say) and wanted to know how much resin to duplicate it, you could fill a pot with water to the brim. Put that in a larger pot or basin, put the action figure in the pot full of water and the amonut of water that pours over the edge into the larger container has an equal volume to the action figure. Pour that into a measuring cup and you can see how much resin you need.
thanks so much , really helped
 

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ichibans13

Active Member
Re: How to determine how much silicone needed for mold and how much resin needed to c

L x W x H x 18.5 = total grams / 2 = how much part A or B if you're using something that is a 1:1 ratio. I got that off of one of the videos from Tested's channel on YouTube. They were making a mold of a lightsaber and through that equation up on the screen.

I don't have any cool equations for resin. The displacement suggestion would work.
 

fallimar

Sr Member
RPF PREMIUM MEMBER
Re: How to determine how much silicone needed for mold and how much resin needed to c

Yeah, to find out how much resin I need for a mould I fill it with water and then pour into a cup on a scale. That or into a measuring cup if I want volume rather than weight.

You can also do a quick volume calculation if you're doing a block mould and subtract the volume of the object, Length X width X height, 1cubic centimetre = 1ml, so a mould that needed to be 6cm by 10cm by 10cm would be 600ml minus the volume of the object(s) to be moulded :)
 

clarence

Well-Known Member
Re: How to determine how much silicone needed for mold and how much resin needed to c

The water is the best way to do it I think Also to derermine how much resin rice or sugar fill mould empty in mixing cup mark level thats the amount needed
 
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