According to MAAREC(mid-atlantic apicultural research extension consortium) says all "commercial wax' fouindation has shown to contain chemicals such as apistan and coumophous(checkmite) I am unsure how any provider can promise no chems in there wax unless they produce all of it themselves. How can one beekeeper make enough wax for saleable quantities of wax. They must buy it from other beekeepers. Do they use chems? How about chems the bees bring back from foraging in the fields. I personally decided to use plastic foundation and will scrape every two years to prevent accumulation of environmental contamination and spread of viruses. I say this info because I dont know the answer, not to suggest any one provider isn't chem free, but I am unsure as to how they can "promise" this result. Thinking out loud.....