Byggnadsklass
Cellulosa Ether HPMC and HEMC / MHEC Solutions for Tile Adhesive, Wall Putty, Plaster, Mortar, EIFS, Waterproof Mortar, and Drymix Building Materials

Construction grade cellulose ether is a functional polymer additive designed for cement-based and gypsum-based building materials. It helps improve water retention, workability, open time, anti-sag behavior, and mortar consistency in drymix construction systems. The most common types used in construction are HPMC and HEMC / MHEC.

HPMC (Hydroxypropyl Methylcellulose) and HEMC / MHEC (Hydroxyethyl Methylcellulose) are the most commonly used cellulose ethers in drymix construction materials. They are used in tile adhesive, wall putty, plaster, mortar, EIFS / ETICS, waterproof mortar, and repair mortar, among other applications.

In tile adhesive, cellulose ether improves water retention, extends open time, enhances troweling performance, reduces tile slip (anti-slip behavior), and supports stable mortar consistency. These functions help applicators work more efficiently and achieve better bonding results.

In wall putty, cellulose ether improves water retention, scraping smoothness, workability, surface finish quality, and application stability. It helps the product spread more evenly and reduces rapid drying on porous substrates.

Neither is universally better — the right choice depends on the specific application and performance requirements. HPMC is versatile and widely used across many drymix materials. HEMC / MHEC is especially strong in construction systems that require longer open time, better anti-sag performance, and stable mortar handling. Both can be considered for many applications.

For most drymix construction materials, cellulose ether dosage typically ranges from 0.1% to 0.5% by weight of the dry blend, depending on the application type and performance target. Self-leveling compounds may use lower dosages, while tile adhesive and EIFS mortar may require higher dosages. Final dosage should always be confirmed through formulation testing.

Yes. HPMC and HEMC / MHEC help retain water within the mortar matrix and maintain workable consistency for a longer period. This can significantly improve open time in tile adhesive, plaster, wall putty, and EIFS systems — giving applicators more time to work with the material.

Yes. Suitable HPMC and HEMC / MHEC grades can help improve mortar rheology and structural integrity, reducing sagging or slipping on vertical surfaces. This is particularly important for tile adhesive, EIFS mortar, and repair mortar applications on walls.

Start by identifying your application type, formulation system (cement-based or gypsum-based), viscosity target, water retention requirement, open time need, anti-sag requirement, and local job-site conditions. LANDERCOLL can help recommend suitable HPMC or HEMC / MHEC grades based on your specific requirements.

HPMC provides versatile water retention, thickening, film forming, and workability improvement across a wide range of drymix systems. HEMC / MHEC is particularly valued in construction applications for its strong open time performance, anti-sag behavior, and stable mortar handling. Both are non-ionic, water-soluble cellulose ethers suitable for drymix formulations.