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Dempul Dinding / Lapisan Skim HPMC and HEMC / MHEC solutions engineered for smooth scraping, superior water retention, consistent workability, fine surface finish, and reliable wall finishing performance in cement-based and gypsum-based systems.

HPMC (hydroxypropyl methylcellulose) and HEMC / MHEC (hydroxyethyl methylcellulose) are the two main types of cellulose ether used in wall putty and skim coat formulations. Both improve water retention, smooth scraping behavior, workability, leveling performance, consistency, and surface finish quality.

HPMC improves water retention, smooth scraping feel, workability, leveling behavior, mortar consistency, and surface finishing quality in wall putty and skim coat formulations. It is widely used in both cement-based and gypsum-based wall finishing systems.

HEMC / MHEC improves water retention, smooth application feel, open working time, anti-sag behavior, mortar consistency, and surface finish quality in skim coat and wall putty systems. It is especially effective in exterior wall putty and thick-layer finishing applications.

Water retention prevents wall putty from losing moisture too quickly after mixing and during application. This maintains workability throughout the scraping and leveling window, supports stable setting or drying behavior, reduces cracking risk from rapid moisture loss, and helps achieve a smoother, more uniform surface finish — especially important on absorbent substrates or in hot, dry conditions.

A common reference dosage range is 0.2%–0.5% by weight of the dry formulation, depending on binder system, application type, target smoothness, viscosity grade, and raw material system. Gypsum-based systems typically use lower dosages (0.1%–0.3%), while cement-based and exterior systems may require higher dosages. Final dosage must always be confirmed through laboratory and application testing.

Yes. Suitable HPMC or HEMC / MHEC improves water retention, viscosity balance, workability, and scraping feel — all of which directly contribute to smoother application behavior and better surface finish quality. Filler fineness and binder system also play important roles in overall surface smoothness.

Stickiness in wall putty is typically caused by excessive cellulose ether dosage, unsuitable high-viscosity grade, high polymer powder dosage, excessive water addition, or an unbalanced filler system. Reviewing the cellulose ether grade and dosage is usually the first step in diagnosing stickiness problems.

Cellulose ether can help reduce cracking related to rapid water loss by improving water retention and internal cohesion. However, cracking performance depends on the complete formulation, application thickness, substrate condition, drying rate, and environmental conditions. Cellulose ether is one contributing factor, not the sole solution.

Both are effective, and the best choice depends on your specific formulation and application requirements. HPMC is versatile and widely used across interior wall putty, cement-based skim coat, and gypsum-based systems. HEMC / MHEC is preferred where extended open working time, anti-sag performance, and smooth application feel are primary requirements — particularly in exterior wall putty and thick-layer applications.

Start by defining your binder system, filler fineness, target smoothness, application thickness, water retention requirement, anti-sag need, and desired surface finish. Share these details with LANDERCOLL and our technical team can recommend suitable HPMC or HEMC / MHEC options for laboratory evaluation.