in Liquid Rubber & Plastic for Moldmaking & Casting

Prototypes & Tooling

Doll Sculptor Finds a Cinderella Story at Seminar

 But the shoe's design, and the limited time Montoya had in which to complete the project (two days), presented a real moldmaking challenge. A shoe is a difficult object to cast because it is a thin-walled shape that requires an inner and outer mold.

The Group Agrees on a Plan
     Guided by the experience of Polytek^® instructors, the audiences at every seminar decide how to approach each moldmaking     challenge. This is the most difficult part of each project because there are so many factors to consider that differ from job to job.
     The group consensus was to remove the strap, which could be molded separately if desired. The porous canvas interior was made nonporous and shiny by coating the interior of the shoe with molten wax.

Fill the Shoe with a "Foot" Plug
     Poly Plasticene was used to build up a collar from the top edge of the shoe. This created a space in which to pour a "foot" into the shoe. Fast-setting, firm Poly 75-60 Poly Urethane rubber was poured into the shoe and plasticene collar to create a stiff "foot" and "ankle." When the Poly 75-60 was hard, the plasticene was removed.
     Next, the foot and shoe were placed in a mold box and fast-setting PlatSil^® 71-10 was poured over them. This created the mold of the outside of the shoe. When cured and turned upside down with the shoe model removed, the mold for the shoe was ready to pour through the heel and sole after applying a light coat of Pol-Ease^® 2300. To hasten the cure and aid the flow of Poly-Optic^®, the mold and foot plug were heated to about 140°F.

A Perfect Crystal Slipper 3 Hours Later
     Poly-Optic^® 1410 was mixed, evacuated, and poured into the warm mold. Several hours later, Juanita was able to demold a perfect, clear Cinderella's slipper. Poly-Optic^® can be easily tinted to yield clear castings of any desired color

Part X for Faster Castings

Make Parts in Minutes

     Poly Urethane Liquid Plastics such as our Poly 15 Series can be made to set and cure very fast, making parts in minutes, with the addition of Poly 15 Part X Accelerator. In fact, several of the Poly 15 Series plastics are offered as an X version with Part X already added by us. If you wish to speed the cure of any of these resins yourself, you can add the Part X. It must be added to the Part B and stirred in thoroughlyprior to mixing the B with the A. Usually less than 1% Part X on the weight of the total mix is used; more may affect the final properties of the plastic.
     You should experiment to determine the desired amount of Poly 15 Part X to add to each resin, as each responds differently. The chart below will serve as a guide for the amount to add to Poly 1512

EFFECT OF POT LIFE AND DEMOLD TIMES
ON POLY 1512 WITH POLY 15X ACCELERATOR

Poly-Optic^® Liquid Plastic

•Crystal-clear, non-yellowing, easily tinted
•Pour it in one shape, heat it, and bend it to another

Vacuum degassing is usually necessary to assist removing all air bubbles.

New EasyFlo™ 60

Super Low Viscosity Casting Resin
Liquid Plastic Pours Like Water, Sets Fast

     Many resin casters demand the lowest possible mixed viscosity from their resin system. Low viscosity equates to easy mixing, excellent detail penetration, and the most bubble-free castings without employing vacuum degassing and pressure casting techniques. If low viscosity is important to you, look no further. EasyFlo^TM 60 is an outstanding new 1:1 (by volume), white, polyurethane plastic with the lowest mixed viscosity available, 60 cP.
     EasyFlo^TM 60 has a 21¦2-minute pot life and a 15- to 30-minute demold time, depending on the thickness of the casting. EasyFlo^TM 60 is extremely fluid, so it rotocasts nicely and, accepts high filler levels, making it a suitable resin system for various cold-cast techniques such as cold-cast bronze, marble, etc. It is also readily color-cast or painted. Thin-walled castings made from EasyFlo^TM 60 have surprising strength and lack the brittleness typical of other low viscosity, fast, competitive polyurethane casting resins.
     Call Polytek^®'s technical customer service staff to see how this exciting addition to our resin line fits into your casting application. Don't forget to take advantage of a low-cost, freight-free trial order to see exactly how EasyFlo^TM 60 performs for you.

Poly 15-8

New Aluminum-Filled Liquid Plastic
for Tools, Forms, and Dies

     Poly 15-8 has just been introduced as an easy-to-use, pourable, aluminum-filled polyurethane casting material. It has been designed for use where thermal conductivity is important to help cool the formed material and heat resistance is adequate to withstand constant exposure to hot formable plastics.
     When parts A and B are mixed together in proper proportion, the mix cures in any volume to a tough, solid plastic with minimal shrinkage for best dimensional stability. Heat distortion temperatures of 95°C are possible with a 4-hour postcure at 100°C. Poly 15-8 is easily drilled for vacuum holes, as it contains only low-abrasive materials for long drill life.

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