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Smooth-Cast^tm ROTO  is a semi-rigid plastic (Shore 65D) that offers good physical properties at a low cost . ROTO is priced the same as Smooth-Cast^tm 300 casting resin and offers the same working time, cure time and appearance (bright white) when cured. 

The primary performance differences between
Smooth-Cast 300 and Smooth-Cast ROTO: 

A.  Unlike Smooth-Cast^tm 300, Smooth-Cast^tm ROTO does not “snap-cure”.  The cure “profile” for ROTO is gradual, which translates into a more uniform distribution of the liquid plastic in the mold cavity as it is being rotated.  There is also less trail and error when trying to estimate the amount of material to use to attain a uniform wall thickness and adjust the speeds of your X and Y-axis arms on your rotational casting machine.

B. Smooth-Cast^tm ROTO cures to a semi-rigid 65D vs. a rigid 70D for Smooth-Cast 300.   Cured hollow Smooth-Cast^tm ROTO castings are more impact resistant and less susceptible to breaking if dropped.

C. You can hand rotationally cast Smooth-Cast^tm ROTO.  If you have ever tried to rotationally cast Smooth-Cast^tm 300 by hand, you know that it is very difficult unless you first add a filler.

Above:  Rotational casting machine yields a hollow, lightweight casting in about ten minutes.

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