The reason for so much attention being paid to the formaldehyde levels of engineered flooring is that it has become known that formaldehyde is a carcinogen. Some countries such as the United States and Japan have very strict regulations governing building products that use wood glue. The presence of formaldehyde in wood glue is something that CRAFT takes very seriously, and we have therefore committed to using the highest quality formaldehyde-free wood glue available.