SMOOTH-CAST 300 White
Ultra-Low Viscosity Liquid Plastic
Smooth Cast 300 is a new ultra-low viscosity casting resin that yields virtually bubble free castings in 7 - 10 minutes (depending on mass and mold configuration). Easy to mix and pour, SC 300 offers the convenience of a one to one mix ratio (one part A to one part B by volume).
SC 300 readily accepts fillers (such as URE-FIL 3) and can be pigmented. (Smooth-Cast 320 accepts pigments better than SC 300). This product is superior for cold cast metal applications. Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for SC 300 include reproducing small to medium size sculptures, cold cast bronze, making prototype models, special effect props, decorative jewelry, etc.
Go "Foam Crazy" with SC 300! By adding additional components, SC 300 can be foamed to achieve a variety of different properties and effects.
Description: SC 300 consists of two liquid components, Part A (Yellow Label) and Part B (Blue Label). When combined in a mixing ratio of one to one by volume, SC 300 quickly cures to a solid and durable plastic.
Preparation . . . All liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal, glass or plastic. Mixing should be done in a well ventilated area. Wearing eye protection, latex gloves and long sleeve garments to minimize skin contact is strongly recommended.
Applying A Release Agent . . . A release agent is necessary to facilitate demolding when casting into or over most surfaces. Use a release agent made specifically for mold making (Universal Mold Release or Manns Ease Release 2251). A liberal coat of release agent should be applied onto all surfaces that will contact the plastic. ~IMPORTANT: To ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes.
Most silicone rubber molds usually do not require a release agent unless casting silicone into the mold. Applying a release agent, however, will prolong the life of the mold.
Mixing . . . After dispensing equal amounts of Parts A and B into mixing container, mix thoroughly. Stir slowly and deliberately making sure that you scrape the sides and bottom of the mixing container several times. Be careful not to splash low viscosity material out of the container.
Remember, SC 300 sets up quickly. Do not delay between mixing and pouring.
Pouring . . .For best results, pour your mixture in a single spot at the lowest point of the containment field and let the mixture seek its level. This will help minimize air entrapment.
Curing . . .SC 300 will cure in 7 - 10 minutes depending on mass and mold configuration. Non-hazardous fumes, which may be visible as this product starts to "gel" and cure, will dissipate with adequate (room size) ventilation. Post curing (heating your casting to 150°F/65°C) for 4 6 hours increases physical properties and performance.
Performance . . .Cured castings of SC-300 are rigid and durable. They resist moisture, moderate heat, solvents, dilute acids and can be machined, primed/painted or bonded to other surfaces (any release agent must be removed). If machining cured SC300, wear dust mask or other apparatus to prevent inhalation of residual particles. Castings can be displayed outdoors after priming and painting. Unpainted castings will yellow over time - more quickly when exposed to ultra-violet light. Because no two applications are quite the same, a small test application to determine suitability is recommended if performance of this material is in question.
Go "Foam Crazy" With SC 300
By adding water, Urefil 3 Filler and SO-Cure Cure Accelerator in specific proportions, SC300 can be consistently foamed to achieve a variety of properties and effects. Different foam densities are possible (10 lb. 23 lb.) .
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