CA Pub Res Code Section 19515.5

Chemical Composition Tolerance (+ or - Oxides Percentage Weight Percentage Range) Silicon Dioxide 66-75 1.00 Aluminum Oxide 0-7 0.50 Calcium Oxide 5-15 0.50 Magnesium Oxide 0-5 0.50 Sodium Oxide 8-18 0.50 Potassium Oxide 0-4 0.50 Iron Oxide less than 0.5 0.05 Chromium Oxide less than 0.1 0.02 Sulfur Trioxide less than 0.2 0.02 All other oxides less than 0.1 0.02 Organic Carbon less than 0.1 0.02 Moisture Content less than 0.5 0.05 (No caking with free-flowing fiberglass) Loss on Ignition less than 1.0 0.10