I have used this type of cage for years and years with no problems, infact my chinchillas have continued to thrive. If you want to know ingrediants call the manufacturer, there should be a stamp on your peice of plywood. I get this every time Marshall builds me a new cageand I post it. We are very very careful about how my cages our built. I (knock on wood) have never had any issues arise because of my cages. But when in doubt don't use something. I am not in doubt about how my husband built them so I will continue the same way I always have.