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Hydroxypropyl Methyl Cellulose for Wall Putty: What the Viscosity Number on the Datasheet Is Not Telling You

Most wall putty manufacturers select HPMC on two criteria: viscosity and price. This is understandable — viscosity is the most visible specification on any HPMC cellulose ether datasheet, and price is always a factor in a cost-sensitive product category. The problem is that viscosity alone predicts wall putty performance only partially — and in the cases where it fails to predict it, the failure shows up on a customer's wall, not in a laboratory. This article is for wall putty producers who want to understand what actually drives field performance, and what to look for in an HPMC specification beyond the viscosity number.

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