Factory Mutual is a global insurance and risk management organization. When a hydraulic fluid carries FM Approval, it means the fluid has been rigorously tested and certified to resist ignition when sprayed as a mist or leaked onto a hot surface. An FM-approved fluid drastically reduces the risk of a catastrophic fire. Without this approval, your insurance carrier may deny claims related to hydraulic fires.
When cement is supplied as “FM26 compliant,” the manufacturer must provide a test report showing:
Physical properties
Sulfate resistance type
To earn the FM26 ISO designation, filter media (typically glass fiber or synthetic cellulose) must resist degradation in: fm26 iso
FM26-rated filters must demonstrate a minimum contaminant holding capacity of 26 grams of ISO MTD (Medium Test Dust) before reaching terminal pressure drop, as per ISO 16889.
Most fluids classified as FM26 ISO are water-glycol hydraulic fluids. Their composition is a carefully balanced engineering cocktail: Factory Mutual is a global insurance and risk
Key physical properties of FM26 ISO:
FM26 does not specify additive performance — only the base cement. Physical properties
Always verify the specific product meets "ISO 12922 HFC" and has an active FM Approval certificate.