Materials should be stored and used in a warm environment (73° F / 23° C). This product has a limited shelf life and should be used as soon as possible. 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. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk.
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 Mann’s Ease Release™ 200 available from SmoothOn or your Smooth-On distributor). A liberal coat of release agent should be applied onto all surfaces that will contact the plastic.
IMPORTANT: To ensure thorough coverage, apply release and brush with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes.
Smooth-On silicone rubber molds usually do not require a release agent unless casting silicone into the mold. Applying a release agent will prolong the life of the mold.
Measuring – The proper mixing ratio is 100 Parts A to 100 Parts B by weight. Dispense the required amount of Part A into a mixing container. Dispense the appropriate amount of Part B and combine with Part A.
Mixing – Materials should be stored and used in a warm environment (73° F / 23° C). Shake or stir Part A & Part B before using. Add Part A to Part B and 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 container.
If tinting or pigmenting TASK™ 11, add the tint or pigment dispersion to Part B and mix thoroughly before adding Part. A.
Pouring – If casting TASK™ 11 into a rubber mold, pour mixture in a single spot at the lowest point of the mold. If encapsulating an object, do not pour the mixture directly over the object. Let the mixture seek its level. A uniform flow will help minimize entrapped air.
For Best Results . . . Best results are obtained using a pressure casting technique. After pouring the mixed compound, the entire casting assembly (mold, dam structure, etc.) is placed in a pressure chamber and subjected to 60 PSI (4.2 kg/cm2) air pressure for 16 hours.
IMPORTANT: Shelf life of product is reduced after opening. Remaining product should be used as soon as possible. Immediately replacing the lids on both containers after dispensing product will help prolong the shelf life of the unused product. XTEND-IT™ Dry Gas Blanket (available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products.
Curing – Important: Use this product with at least room size ventilation or in proximity to a forced outlet air vent and do not inhale/breath fumes. Fumes, which may be visible with a significant mass concentration, will quickly dissipate with adequate ventilation. Castings with significant mass may be hot to the touch and irritate skin immediately following cure. Let casting cool to room temperature before handling.
Demold time of the finished casting depends on mass and mold configuration. Low mass or thin-walled castings will take longer to cure than castings with higher mass concentration.
If making rotational or hollow castings, backfilling with a rigid foam (Foam-iT! 5 or other) will provide lightweight reinforcement. Foam backfilling is recommended if castings will be subjected to temperatures above 85°F / 30°C.
Post Curing Option – Castings will reach “full cure” faster and achieve maximum physical properties / heat resistance if TASK™ 11 is heat post cured in a dedicated shop oven. Post curing is recommended if castings are thin or of low mass concentration. Castings should be post cured in a mold or support structure. Allow the material to cure fully at room temperature followed by 4 hours at 150°F (65°C). Casting should be allowed to cool to room temperature before handling.
If you are pouring less than 1/4 in. (0.64 cm) of material, the casting should be heat post cured. If desired thickness is greater than 3 in. (7.62 cm), it is recommended that consecutive casts be made (one pour on top of another) with 30 minutes in between each casting to allow for heat dissipation.
FOOD CONTACT APPLICATIONS…
Properly cured parts cast from TASK™ 11 Rigid Polyurethane, comply with the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended, and all applicable food additive regulations as articles or components of articles intended for use in the contact with foods as stated in the Code of Federal Regulations 21 CFR, Section 177.1680 governing the use of Polyurethane resins. This certification shall continue in effect until revoked by written notice and shall apply to all TASK™ 11 Rigid Polyurethane System material shipped prior to receipt of such written notice.
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.