The material properties and technical requirements of putty are essential for ensuring its quality and performance. Here is a detailed breakdown of the key components used in putty formulation:
Carboxymethyl cellulose (CMC) is a white, fibrous substance with strong hygroscopic properties. It dissolves easily in water and plays a crucial role in enhancing the viscosity and workability of the putty. This makes it an important additive for improving the consistency and ease of application.
Big white, also known as calcium carbonate, comes in both block and powder forms. It must be pure white in color and should pass through an 80-mesh sieve to ensure fine particle size. This ensures smooth blending and a uniform finish when applied.
Gypsum is a white powder derived from plaster. It is a gas-hardening cementitious material that must be kept dry and protected from moisture or rain. Using damp or clumped gypsum can significantly reduce the quality and strength of the putty, so it should be strictly avoided.
Talc is a soft, light, and smooth mineral that helps improve the texture and flexibility of the putty. It also contributes to better adhesion and a smoother surface finish.
Polyvinyl acetate emulsion, commonly referred to as "emulsion," acts as a binder that prevents other materials from settling or separating. It enhances the cohesion of the putty, reduces cracking, and improves overall workability. This makes the putty easier to apply and more durable once dried.
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