FIRE PROTECTIVE BARRIER AND METHOD OF APPLYING

摘要

An inventive method of applying an ignition barrier to a mass of foam plastic insulation. The method includes applying at least one layer of protective material to the foam. The protective material includes a silicate material and a liquid and has a wet thickness of at least about 12 mils. The protective material provides an ignition barrier for at least 4 minutes and 18 seconds. The silicate material can be silica sand and a second material such as soda ash or potassium oxide. The silica sand and second material are present in a weight ratio of between about 1:1 and about 20:1 with some embodiments having a weight ratio of about 4: 1 or about 3.22: 1. The protective material may also be applied in a sufficient thickness, e.g., between about 26 to 80 mils and advantageously between about 50 to 52 mils, to form a thermal barrier for the foam plastic insulation.