b'Unique Formulation HZ10 SubstrateHardieTrim Not all fiber cement is the same. James Hardie HZ10 products containBoardsthe highest quality raw materials. Our unique formulation, combinedArctic Whitewith innovative product design and manufacturing processes, create a substrate that is specifically engineered to resist moisture, cracking, shrinking and swelling for increased durability and workability.PROPRIETARY ENHANCEMENTS CREATEDURABLE JAMES HARDIE SIDINGPerfect balance of strengthand workabilityOur balance of high-quality Portlandcement, sand and cellulose fiber deliversthe best combination of strengthand workability.Enhanced moisture resistancefor unmatched durabilityPatented and proprietary additivesare chemically bonded within theHZ5 substrate matrix to providedurable moisture resistance. Increased dimensional stabilityOur siding is engineered at the microscopiclevel to create a fiber cement compositewith superior dimensional stability thathelps protect against shrinkingand splitting. 6'