Numerous resin casters require the lowest possible mixed viscosity from their resin system. Low viscosity allows uncomplicated combination, optimum detail penetration, and virtually bubble-free castings without employing vacuum degassing and pressure casting methods. Liquid Plastic 60 offers the lowest mixed viscosity available, 60 cps. It is an innovative 1:1 (by volume), white, polyurethane plastic.

Liquid Plastic 60 has a 2 1/2 minute pot life and a 15 to 30 minute demold time, which varies relative to the thickness of the casting. Liquid Plastic 60 accepts high filler levels because it is very fluid. This permits it to provide a sufficient resin system for several cold-cast methods such as: cold-cast bronze, marble, etc. Color-cast or paint can be applied easily. Unlike other low viscosity, fast, competitive polyurethane casting resins, Liquid Plastic 60 has surprising strength and durability in its thin-walled castings.

These products reproduce minute detail from a mold or pattern, but may stick or foam when poured on surfaces that are not adequately prepared. A trial casting should be executed on a similar surface before the final mold is made to avoid damaging a valuable mold. Polyethylene and silicone rubber molds, such as Tin Silicone and Platinum Silicone systems, do not require a release agent, but a barrier coat may be helpful. Latex, polyurethane rubber or metal molds have to be dry and necessitate a coat of a suitable release agent, such as Ease 2300 Release Agent. The 74 Series are well suited for limited casting in 15 Series products.

Part X is a strong catalyst that increases the speed of curing. A few drops in a one-pound mix speeds the cure profusely. Exotherm (heat of reaction) is increased, so shrinkage on cooling also increases. Use experimental results to determine the correct quantity of Part X to use. Never use more than 1% Part X of the total weight of the mix because it will affect the final physical properties. 15-3X and 1512X already have Part X added. Part F may be added to mixed 15-6 and 1510, (up to 3%) to produce foams with densities as low as 6 lbs. per cubic foot. Fiber may be added to thicken the mix to a paste consistency. Microballoons may be added to create a wood-like, lower density material. See LiteCast.

Before mixing, all molds and equipment must be prepared. Parts A and B should be above 60°F. Stir parts A and B thoroughly prior to use. Sediment may develop on the bottom of the container. Normally, moderate mixing to disperse the sediment before use is all that is required. The containers of Parts A and B should be used or resealed tightly after opening because atmospheric moisture contamination may instigate foaming of the plastic. Use metal or plastic mixing vessels and spatulas to avoid introducing moisture as may occur with paper or wood tools. Measure or weigh Parts A and B and place in a mixing container. Polyethylene buckets are superior and can often be reused. Add Part X or Part F after the components are weighed, if desired. Mix immediately and thoroughly scrape the sides and bottom for one minute. Pour mix into cavity as quickly as possible. If desired, Cab-O-Sil or Fiber can be added after Part A and B are mixed.

Cured 15 Series plastics should be painted for outdoor use because they will yellow and chalk when exposed to sunlight. They can be simply drilled, sanded and machined. Adhesion of the coating should be checked carefully over a period of time to determine that it is satisfactory for the intended use after painting or coating. Oil paints work adequately if detergent and/or solvent washing remove the mold release.

Tools should be scraped clean before the plastic hardens. Alcohol (shellac thinner), acetone or MEK are worthy cleaning solvents, but are highly flammable. To easily remove hardened resin, work surfaces should be waxed or coated with Ease 2300 Release Agent.

At least six months in unopened containers stored at room temperature (60-90°F).

See Methods of Use. Plastics are highly flammable. Sanding dust and other easily ignitable forms of these products should be handled with care.

Physical Properties:

Liquid Plastic 60

Mix ratio, by volume

1A to 1B

Hardness, Shore D

65

Pour time, 1 lb. mix (faster with Part 15X)

2 1/2 min.

Demold time (faster with Part 15X)

15-30 min.

Specific gravity, g/cc

1.03

Color, cured

White

Mixed Viscosity

60 cps.

Specific Volume, cu. inches/lb.

26.9 cps.

Packaging:

Containers

Size

Net lbs.

Product

Weight/lbs.

A

B

A

B

Liquid Plastic 60
Mix Ratio
1A to 1B

3.8

1 qt.

1 qt.

2.0

1.8

15.2

1 gal.

1 gal.

8.0

7.2

76.0

5 gal.

5 gal.

40.0

36.0

855.0

55 gal.

55 gal.

450.0

405.0