Cementitious waterproofing solutions
Amitek HMC-501
Acrylic emulsion polymer for flexible cementitious mixes.
Discover Amitek HMC-501
Flexibility, adhesion and water resistance in one cementitious system.
Product video coming soonProduct overview
Flexible mixes.
Durable waterproofing.
Amitek HMC-501 is an acrylic emulsion polymer modifier for cementitious mortars. It enhances flexibility, adhesion and water resistance to improve the performance of cement-based waterproofing systems.
Applied over a nanopore-filling primer system based on Amitek HWR-22 and Amitek CMP-78, the modified mortar forms a durable waterproofing layer on concrete and masonry substrates.
From terraces and balconies to wet areas and repair mortars, HMC-501 supports flexible, well-bonded coatings designed for long-term protection.
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*Coverage depends on surface condition and application thickness.
Key features & benefits
More performance from cementitious mixes.
A polymer modifier that supports flexible coatings, strong bonding and durable protection.
Flexible cementitious mixes
Enhances the flexibility and water resistance of cementitious mortars and coatings.
Strong adhesion
Improves bonding to existing concrete and masonry for a durable waterproof layer.
Minor crack bridging
Helps create flexible coatings that bridge minor surface cracks.
Durability under exposure
Offers resistance to ageing, chemicals and light exposure to support long-term performance.
Formulation compatibility
Compatible with fillers and additives such as silica flour, chalk, ground quartz and defoamers.
Versatile mortar modification
Modifies hydraulic binders and granular aggregates, including systems combined with bitumen emulsions.
Recommended applications
For roofs, wet areas and repair systems.
Suitable for polymer-modified cementitious waterproofing and mortar applications on concrete and masonry.
- Polymer-modified cementitious mortars and waterproofing coatings
- Terraces, flat roofs, balconies and horizontal concrete surfaces
- Wet areas including bathrooms, kitchens and utility spaces
- Repair mortars, screeds and plastering
- Crack-bridging applications on concrete and masonry
- Cement-based waterproofing systems over suitably primed surfaces
Mixing & application
Two stages. One waterproofing system.
Prepare the primer and mortar separately, following the ratios specified in the technical data sheet.
Stage 1 · Primer layer
Apply the nanopore-filling primer and allow it to dry thoroughly.
Stage 2 · Waterproofing mortar
Mix to a smooth, lump-free consistency before application.
Prime the substrate
Apply a nanopore-filling primer using Amitek HWR-22 : Amitek CMP-78 : Water in a 2 : 3 : 20 ratio. Allow the primer layer to dry thoroughly.
Prepare the mortar
Mix Amitek HMC-501 : Cement : Water in a 1 : 0.750 : 0.200 ratio to achieve a smooth, lump-free consistency.
Apply uniformly
Apply the prepared mortar over the primed surface using a trowel or spatula. Ensure proper compaction and adhesion.
Finish and cure
Maintain uniform thickness and finish before the mortar’s initial set. Protect against rapid drying and carry out proper curing.
Formulation guidance: The TDS also describes performance at 20–30% polymer solid modification based on cement weight. This is a separate formulation reference, not a replacement for the stated mortar mixing ratio. Confirm customised formulations with Amitek’s technical team.
Technical specifications
The details behind the performance.
| Typical physical property | Value |
|---|---|
| Visual appearance | Milky white emulsion |
| Specific gravity at 30°C | 1.03 |
| Solid content | 56.0 ± 1.0% |
| pH (as such) | 7.0–8.5 |
| Film test | Clear, tacky film, free from bits |
| Viscosity | 500–1500 cps (Brookfield LVF #1/60 at 25°C) |
Typical figures are provided for reference only and should not be used in preparing specifications.
Coverage & packaging
Coverage: Approximately 21 sq ft per kg of HMC-501-based mix, depending on surface condition and application thickness.
Packaging: 20 kg bucket, as specified in the TDS.
Storage & shelf life
Store in a shaded area away from direct sunlight. Keep unopened original containers under cool, dry conditions.
Shelf life: 12 months from the date of manufacture under these conditions.
Product resources
All the technical details.
In one place.
Amitek HMC-501 · Technical Data Sheet
Plan your cementitious waterproofing system.
Speak with Amitek about product selection, mixing and application requirements.
