8 important changes in the 2016 edition of NFPA 11

The 2016 edition of NFPA 11 Standard for Low-, Medium-, and High-Expansion Foam is now available. Here are 8 important changes that are worth noting. #1) Manufacturers are now required to publish acceptable ranges of density (or specific gravity), pH, refractive index, and viscosity for the foam concentrates that they produce. These values are intended to be used by laboratories to establish pass/fail criteria for annual quality testing. Because this information has not been consistently available in the past, laboratories have been required to make assumptions about the appropriate tolerances. To further support the measurement of foam quality, new definitions...