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Econ® 60 is an economical and fast curing Shore 60A urethane rubber. It has no odor, features a convenient 1A:1B by volume mix ratio and a low viscosity for easy mixing and pouring. Working time is about 6 minutes and handling time is 4 hours at room temperature. Translucent clear amber color (light passes through) makes Econ® 60 easy to color with SO Strong®, UVO® or IGNITE® colorants. Econ® 60 is used to make limited run production rubber molds, stamping pads, rubber prototype parts, rubber props and pour-in-place gaskets for industrial equipment. It is also suitable for coating fabrics.
MEASURING & MIXING - Liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal, glass or plastic. Materials should be stored and used in a warm environment (73°F/23°C).
IMPORTANT: Shelf life of product is drastically reduced after opening. Immediately replacing the lids on both containers after dispensing product will 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.
IMPORTANT: Pre Mix the Part B before using. After dispensing the proper amounts of Parts A and B into mixing container, drill mix thoroughly for 2 minutes using a Squirrel Mixer or equivalent. Then, use a straight edged paddle and mix by hand, making sure that you scrape the sides and bottom of the mixing container several times.
Use the ‘Double Mix and Pour Technique’ - Pour mixture into a new, clean mixing container. Drill mix and then hand mix again for another 3 minutes, scraping the sides and bottom of your container.
ADDING COLOR TO ECON® 60: So-Strong® UVO® or IGNITE® colorants are compatible with Econ® 60. Some test castings may have to be made until desired effect is achieved. Pre-mix color with Econ® 60 Part B before adding Part A.
To minimize air bubbles in the cured rubber, vacuum degassing is recommended (29 inches of mercury). A pressure casting technique using a pressure chamber can yield totally bubble-free rubber. Contact Smooth-On or your distributor for further information about vacuum degassing or pressure casting.
Pouring - For best results, pour your mixture in a single spot at the lowest point of the containment field. Let the rubber seek its level up and over the model. A uniform flow will help minimize entrapped air. The liquid rubber should level off at least 1/2” (1.3 cm) over the highest point of the model surface.
Curing - Allow rubber to cure overnight (at least 24 hours) at room temperature (73°F/23°C) before demolding. Cure time can be reduced with mild heat or by adding Smooth-On “Kick-It®” Cure Accelerator. Do not cure rubber where temperature is less than 65°F/18°C.
Post Curing - After rubber has cured at room temperature, heating the rubber to 150°F (65°C) for 4 to 8 hours will increase physical properties and performance.
Using The Mold - If using as a mold material, a release agent should be applied to the mold before each casting. The type of release agent to use depends on the material being cast. The proper release agent for wax, liquid rubber or thermosetting materials (i.e. Smooth-On liquid plastics) is a spray release made specifically for mold making (available from Smooth-On or your distributor). Prior to casting gypsum plaster materials,sponge the mold with a soap solution for better plaster flow and easy release. In & Out® II Water Based Release Concentrate (available from Smooth-On) is recommended for releasing abrasive materials like concrete.