Two component room temperature curing fluid compound which cures with low shrinkage to a strong flexible mould rubber liquid LH-9040 # has good elongation, high tear strength and excellent release characterristics. Mould rubber will reproduce finite details from patterns of wood, glass. metal, and other materials. A highly anti-adherent flexible compound that is extremely suitable for reproduction of fine details, it has high temperature and chemcal resistance making it well suited for ll types of casting resins, polyester, polyurethane and epoxy.
Shelf life: 6 months, stored in their original tightly closed containers at temperatures in the range from +5° C to +28. Cataylsts are moisture sensitive, keep container closed when not in use.
Mixing: Before proportioning mould rubber liquid and hardner which it is always recommended that they be stirred in their original container in case any settling has occurred. Using an appropriate scale. Weight the base at the ratio recommended for base to Hardner. Selecte a mixing container about 3-5 times larger than volume of RTV required. This will allow of expansion of RTV during the degassing process. Hand mix the base and Hardner until a homogeneous mixture is obtained. Be certain to scrape the site and bottom to incorporate all of the base into the mix.
Degrassing: Air entrapment is undesirable for any mold. To ensure air free molds. It is necessary to remove the air introduced while mixing. De-air the RTV under a Vacuum of 25-29 inches of Mercury. Allow the RTV to rise then break vacuum to collapse the bubbles that have formed repeat 1-2 times.
Pouring The RTV: The model should be positioned in a way as to allow air to freely escape. For the best results, slowly pour the RTV off to side of the model allowing the mold box to fill evenly from the bottom up avoid entrapping air.
Curing time: The curing time is effected by the ambient temperature and humidity, the cure time values given in the data sheet are base on a temperature of 23 and 50+5%RH. Higher temperature and humidity will increase the cure rates and, therefore, reduce work time, lower temperature and or humidity will slow the cure time. In standard cured time, the demolding time is 24-36hours. The mold can be used after 48 hours of cure. But for optimum mold life, it is advisable to allow it to cure up to 4 days for full mechanical propertie to develop. It is not advisable to heat the RTV abvoe 70 to accelerte cure.
