![]() The US Environmental Protection Agency has set regulatory requirements for the maximum amount of PCBs allowed in indoor air and has provided guidelines for school administrators and building owners for how to best manage and limit sources of PCBs. There is growing public awareness and concern that caulking compounds and other construction materials in older buildings such as schools could still be important sources of PCB exposure. Even though PCBs have been banned here, they are still prevalent throughout the world. PCBs were banned in the US in 1979 due to scientific evidence of their adverse effects on humans, animals, and the environment. Once in the environment, PCBs do not break down easily and can remain for very long periods of time. ![]() PCBs are a group of man-made chemicals with no known natural sources. ![]() Historically, exposure to caulk was associated with potential poisoning because caulking compounds as well as many other construction materials such as adhesives, paints, and sealants, used to contain chemicals called polychlorinated biphenyls (PCBs). Most caulks are made up of acrylic, latex, silicone, or a combination of all three. Some are more resistant to moisture or temperature extremes than others. For example, one kind of caulk is appropriate for concrete, brick, or metal surfaces while another kind is better on glass or ceramic tile. There are various kinds of caulking compounds on the market, and each is geared to the specific kind of project. Caulk is indispensable in preventing water damage to these structures and lowering your home’s energy costs by keeping cold or hot air out. It is essential for closing off and sealing gaps and cracks around bathtubs, sinks, windows, doors, plumbing, and electrical wiring. Today, it is the chalky or rubbery sealant you see around your home. Caulk was first used in wooden shipbuilding to fill the space between planks of wood in order to make the vessel watertight. ![]() "Caulk" or "caulking" can refer to the product itself or the process of using it. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |