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Platinum cure silicone rubber is poured into the box to make a mold of the left arm. The silicone is mixed up and then placed in the vacuum chamber that can be seen in many of these shots. The vacuum chamber takes most of the air out of the liquid rubber, so that air pockets and bubbles do not become trapped in the mold. This would weaken the mold and cause casting flaws.

Platinum cure silicone rubber is poured into the box to make a mold of the left arm. The silicone is mixed up and then placed in the vacuum chamber that can be seen in many of these shots. The vacuum chamber takes most of the air out of the liquid rubber, so that air pockets and bubbles do not become trapped in the mold. This would weaken the mold and cause casting flaws.

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