Focus on Cellulose ethers

Mortar additive HPMC

Mortar additive HPMC

Hydroxypropylmethylcellulose (HPMC) is a commonly used mortar additive in the construction industry. It is a modified cellulose ether derived from natural polymers, mainly cellulose. Available in powder form, HPMC is easily dispersed in water to form a colloidal solution.

When added to mortar or cement-based mixes, HPMC has several beneficial properties:

Water retention: HPMC acts as a water retaining agent, allowing the mortar to retain its workability for a longer period of time. This is especially useful in hot and dry environments where rapid evaporation of moisture can cause the mortar to dry prematurely.

Improved Workability: By increasing the consistency and plasticity of the mortar, HPMC enhances its workability, making it easier to mix, spread and apply. This improves the overall handling characteristics of the mortar.

Enhanced Adhesion: HPMC improves the adhesion between mortar and various substrates such as concrete, brick and tile. This promotes better bonding and reduces the risk of delamination or separation.

Reduced Sag: HPMC helps prevent the mortar from sagging or collapsing when applied on vertical surfaces, ensuring better coverage and reducing the need for rework.

Extended Open Time: The addition of HPMC increases the open time of the mortar, thus extending the window of time in which the mortar remains workable and cohesive. This is especially beneficial for large or complex projects that require more time to apply.

Improved Durability: HPMC increases the overall durability of the mortar by reducing shrinkage, cracking and water permeability. It enhances the cohesion and integrity of the mortar, making the final product stronger and more durable.

The exact amount of HPMC required in a mortar formulation may vary depending on factors such as desired properties, environmental conditions and the type of mortar used. It is recommended to follow the manufacturer’s guidelines and technical data sheets for proper dosage and application instructions.


Overall, HPMC is a multifunctional additive that enhances the performance of mortar and cement-based mixtures, improving workability, adhesion and durability.

Post time: Jun-06-2023
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