International Cellulose has developed high performance cellulose products such as K-13, SonaSpray “fc”, SonaKrete, Ure-K, Protek-13, and Celbar. Their commitment to quality is reflected in our ISO 9001:2008 certification. K-13, SonaSpray “fc”, Celbar and Ure-K are manufactured under the Underwriter’s Laboratories (UL) Classification and Follow-Up service program. Additionally, K-13 and Ure-K are Factory Mutual (FM) approved.