Mold making basics: Silicone Block Mold

Block mold explanation. This is the most basic mold method for silicone rubber. This is a good method when speed is more important than overall cost.

We used 73-45 platinum silicone for this particular mold. A cut block mold like this works best with rubber that is shore A20 or higher. This means a medium rubber. Soft rubber such as Gel-10 would be too soft and would distort at the seams.

Category:

Howto & Style

Tags:

• silicone
• block
• mold
• spfx
• special
• effects
• props
• moldmaking
• casting
• resin
• art
• sculpture

[Jabberwockxeno]

Why do you measure the box for the volume of silicone?

Why not just pour it in until the knife is just entirely submerged?

[brickintheyard]

@Jabberwockxeno Ah, but have to know how much to pour in or you might mix up too much or not enough. Silicone is too expensive to just guess esp. when you have to order the right amount of silicone.

[lilVICLim]

Hi, where did you buy the silicone rubber? from manufacturer of distributor?

[brickintheyard]

@lilVICLim Go to 9:47 I think those folks might have it.

[2ndlooks]

isn't it easier to make two-part mold instead of cutting your mold open?

[brickintheyard]

@2ndlooks Depends on how fast the mold needs to be made and what type of part is being molded.

[brickintheyard]

@allenlindley 2 piece mold would be better for that.

[phee73]

What kind of Low Viscosity Silicone would you recommend???

[Kaito713]

couldn't you just vac the silicone with the knife inside it?

[brickintheyard]

@cheo1414 No, that was a vacuum degassing chamber.

[cheo1414]

Hi there, new to molding. What is that container you put the silicone in? a heater?

[PistonHonda87]

Thank you, you save me a lot of grief with my up coming projects.