Starch was added to a 23% aqueous soufa solution to prepare a coating type flame retardant. It is applied to the following cardboard and the degree of combustion is considered.
The photograph after coating and drying is shown.
A 45 ° C combustion test was performed.
The test machine is as follows.
The flame did not penetrate and was able to withstand the 5-minute burn test. It is believed that the foam and carbonized layers of soufa prevented the combustion.