We tested the formaldehyde of Kastar Ceramic Tile Sealer and other brands.

As you see. This is our Kastar Ceramic Tile Sealer sample, and here is a standard formaldehyde tester. After 5 minutes, we can see that the Kastar sample is in the safe range.

But when using the same method to test other products in the same environment at the same time, the result indicates that formaldehyde is moderately exceeded the standard which is.