RectorShield is a heat absorbing paste that prevents damage to sensitive controls, valves, plastic faucet parts/equipment and soldered connections. Easy to apply; does not splatter, drip, crack, dry out or separate, and stays in place during heating. Safe to use, non-staining, easy to clean up and Odorless - no offensive fumes. Biodegradable and safe for the environment. RectorShield; in comparison tests, RectorShield kept the protected side an average 22% cooler than other brands. It lowers heat transfer by absorbing thermal energy from heat/flames while soldering, brazing and welding. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.