MHP HB (primer) and MHP / MHP SP-3000 (trowel-applied repair mortar) form a cement-based system for rehabilitating and protecting manhole benches, walls and soffits. The primer delivers high adhesion performance, while the mortar is one-component, highly sulphate-resistant, compliant with recognised standards, and applied from a minimum 12 mm for durable service in below-ground conditions.

MHP HB is a cement-based bonding agent for concrete or masonry substrates. It’s designed to maximise adhesion and create a strong interface for subsequent repair layers.

MHP / MHP SP-3000 is a trowel-applied, one-component cement-based repair and protection mortar engineered for aggressive sewer environments, including high sulphate exposure.

Use MHP HB whenever you need a robust primer between the existing substrate and the MHP repair mortar. It can be applied to dry or damp surfaces (no ponding water), helping the system develop strong, reliable adhesion on benches, walls and soffits.

• One-component, cement-based repair mortar designed for manhole structures

• High sulphate resistance suitable for sewer conditions

• Open vapour transmission to reduce osmosis-related delamination risks

• Conforms to recognised industry standards for repair mortars and manufacturing quality

• Suitable for building up thickness by trowel in one or more layers

Sewer and wastewater environments often contain sulphates that attack conventional mortars. The MHP formulation resists sulphate-driven deterioration, helping maintain dimensional stability and long-term performance of benches and adjacent surfaces.

The MHP system is produced under controlled, ISO-aligned manufacturing and is tested against recognised repair-mortar standards for chemical, abrasion, flexural, compressive, shrinkage and adhesive properties.

Open vapour transmission allows moisture to diffuse through the repair layer, reducing the risk of trapped moisture, blistering and osmosis-driven delamination — a common failure mode in buried or constantly damp structures.