Surface and edge repair
Potholes, cracks and local damage in concrete floors, plus repair of broken joint edges and corners.
Boydur M12 specifications: the essential performance, application and handling information for specifying this rapid-curing, two-component MMA repair, anchoring and heavy-duty mortar.
Technical data overview
Boydur M12 is a solvent-free, two-component reactive MMA mortar system for rapid repair, anchoring, filling and heavy-duty applications on concrete and mineral substrates. Component A is a reactive MMA resin; component B is a dry blend of mineral fillers and hardener.
Important: Values are typical/nominal and may vary with site conditions, surface condition, temperature, mixing method and application thickness. The current approved Technical Data Sheet, Safety Data Sheet and package instructions take precedence over this webpage. Site trials and, where required, laboratory verification are recommended for critical projects.
Temperature capability
Boydur M12 may be applied from −10°C to +40°C. At around 20°C the area can return to service in approximately 60 minutes; at lower temperatures this time is extended.
System suitability
Suitability depends on substrate strength, preparation, geometry, exposure and required reopening time. Technical review is recommended for critical work.
Potholes, cracks and local damage in concrete floors, plus repair of broken joint edges and corners.
Machine foundations and equipment anchoring, subject to geometry and engineering requirements.
Filling around manhole covers, gratings, profiles and other embedded metal elements.
For dry, sound, clean and load-bearing concrete and mineral substrates, prepared and primed as specified.
High early mechanical strength and a water- and weather-resistant system for heavily used areas.
Airport aprons and service areas, ports, shipyards, logistics sites, factories, warehouses, car parks, ramps, service roads and bridges.
Application protocol
The surface must be dry, sound, clean and load-bearing. Remove oil, dust, loose particles, laitance and contaminants. Cut back damaged concrete to a sound base and clean or roughen mechanically as required.
On absorbent mineral substrates, apply Boydur® A10 or a suitable MMA primer. Do not apply Boydur M12 until the primer has fully cured.
Place the 3 kg A component in a clean, dry container and briefly homogenise. Add the 15 kg B component gradually and mix with a low-speed mixer until a homogeneous, lump-free mortar is obtained.
Use the mixed material within the approximately 25-minute working time at 20°C. Do not continue using material whose pot life has expired.
Place the mortar into the repair or anchoring cavity, compact with a trowel and level to the surrounding surface. Apply at a minimum thickness of 5 mm.
At around 20°C the area can return to service after approximately 60 minutes. At lower temperatures this time is extended.
Common application errors
Application onto wet or damp substrates is one of the most common causes of failure. The surface must be completely dry.
Applying without cleaning, or leaving weak concrete zones in place instead of cutting back to a sound surface, compromises adhesion.
Incomplete or insufficient mixing of components A and B, or using material after its pot life has expired, affects curing and performance.
Do not apply below 5 mm. For deeper repairs, aggregate grading or a layered application system may be used.
Controlled documents
Technical FAQ
The complete Boydur M12 specifications are in the current Technical Data Sheet (PDF). You can also request the TDS, SDS and brochure by e-mail using the form on this page.
At around 20°C, the area can typically return to service in approximately 60 minutes. At lower temperatures this time is extended.
The stated application range is −10°C to +40°C, and the service temperature range is −40°C to +60°C.
Typical Boydur M12 specifications include compressive strength of approximately 34 N/mm², flexural strength of approximately 24 N/mm², E-modulus of approximately 4,350 N/mm², Shore D hardness of 75–80 and pull-off adhesion of approximately 3.9 N/mm².
No. The substrate must be dry, sound, clean and load-bearing. Application onto wet or damp surfaces is listed among the most common application errors.
On absorbent mineral substrates, Boydur® A10 or a suitable MMA primer should be applied, and Boydur M12 should only be placed once the primer has fully cured.
The minimum application thickness is 5 mm. For deeper repairs, aggregate grading or a layered application system may be used; a fixed maximum single-layer thickness is not published because it depends on aggregate distribution and site temperature.
It is supplied as an 18 kg set: 3 kg A component (reactive MMA resin) and 15 kg B component (mineral filler and hardener). Store in original unopened packaging in a dry, cool and well-ventilated place. The recommended shelf life is 12 months.
Project-specific support
For a meaningful review, include substrate, repair dimensions, temperature, traffic, exposure and required reopening time.
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