If you're unsure whether or not your acrylics have MMA, there are a few things you can look for. MMA is a volatile compound, so if your acrylics have an strong odor, that's a good indicator that they contain MMA. You can also check the ingredients list on the product label - if it lists methyl methacrylate monomer (MMA) as an ingredient, then your product contains MMA.
Another way to tell if your acrylics have MMA is to look at the consistency of the product. Acrylics that contain MMA will be much thinner and more liquid-like than those that don't contain this compound. This is because MMA evaporates quickly, which leaves behind a thinner product.
If you're still not sure whether or not your acrylics contain MMA, you can always contact the manufacturer and ask them directly. They should be able to give you an accurate answer.