About MC-Bauchemie MC-Fastpack PU solid

MC-Fastpack PU solid is MC-Bauchemie’s ready-to-use, two-component rigid polyurethane adhesive, supplied pre-dosed in a 400 ml double-chamber cartridge at a fixed 2:1 (A:B) volume ratio. The two components only meet inside a disposable static mixer once the cartridge is loaded into the MC-Fastpack Power-Tool, coming out as a uniform grey, thixotropic paste that holds its shape on vertical crack lines and inside drilled holes up to roughly 10-20 mm without sagging.

On Indian sites it earns its keep as the enabling step of a crack-injection job, not the resin itself: it bonds injection packers to the crack face, bandages the surface so pumped resin doesn’t blow out sideways, and plugs anchor or drill holes once the resin is in. Basement waterproofing retrofits, water-tank repairs, factory floor cracks and structural strengthening jobs across Delhi NCR all lean on this same sequence — bond the packer, seal the line, inject, then remove the packer. Because it bonds to damp concrete and sets fast, crews aren’t stuck waiting for a bone-dry substrate that a monsoon-season basement rarely offers.

The technical insight

The two components run at very different viscosities — component A around 180 Pa·s, component B around 966 Pa·s (DIN EN ISO 3219) — and it’s this deliberate mismatch, paired with the fixed 2:1 volume ratio, that keeps the static mixer delivering a consistent paste rather than a marbled, under-reacted one. Cured hardness sits at Shore A 80-90 (ISO 868) with about 20% maximum expansion (DIN 53455) — rigid enough to resist injection-pump pressure without deforming, elastic enough to absorb the minor movement a crack face makes as resin is pumped through it. The figure that matters most for a bonded packer, though, is adhesive tensile strength: 3.39 MPa on 24-hour concrete (DIN EN ISO 1542), recorded as a substrate (100%) failure — pull-test a bonded packer and the surrounding concrete gives way before the MC-Fastpack PU solid bond does.

Where it is used

• Bonding injection packers/nipples to crack faces before pressure-grouting with epoxy or PU resin
• Surface sealing and bandaging of crack lines to stop resin blow-out during injection
• Filling and plugging drill or anchor holes after resin injection or dowel fixing
• Direct filling of dormant cracks and kerfs up to roughly 10-20 mm wide
• Bonding concrete-to-concrete, concrete-to-steel and some plastic substrates for quick patch repairs
• Reprofiling minor surface defects and spalls around injection zones
• Plugging leak-arrest fittings on water-retaining structures ahead of grouting

Key advantages

• Ready-to-use 2:1 cartridge system — no weighing or bucket-mixing on site
• Static-mixer dispensing gives a consistent, bubble-free paste every time
• Bonds to dry or slightly damp concrete, useful on monsoon-season basements
• Rapid early strength (40-80 minutes) keeps injection crews moving same-shift
• High adhesive tensile bond (3.39 MPa) fails in the substrate, not the joint
• Semi-flexible cured hardness absorbs minor movement instead of cracking off
• Thixotropic paste holds on vertical and overhead crack lines without sagging

Limitations & considerations

• Short ~10-minute workability window demands trained, unhurried applicators
• Only bonds packers and seals surfaces — the crack-filling resin is a separate product
• Application limited to +5°C to +40°C; cold winter mornings slow curing
• Needs the MC-Fastpack Power-Tool for reliable dispensing — improvised mixing isn’t recommended
• Grey, rigid-PU finish needs further treatment on exposed architectural surfaces

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Fastpack PU solid

MC-Fastpack PU solid sits in MC-Bauchemie’s cartridge-dispensed MC-Fastpack range alongside MC-Fastpack PR solid and MC-Fastpack EP solid, both built on the same double-chamber, Power-Tool-dispensed format but formulated for different site conditions — Space Arc stocks the family so packer-bonding paste can be matched to substrate and season. It is a companion to MC-Bauchemie’s own PU and epoxy crack-injection resins, not a substitute — those do the actual gap-filling once packers are bonded. Where a project’s injection scope runs on Fosroc’s Nitofill PU or epoxy resin range instead, specifiers typically pair it with a matching Fosroc surface-sealant system rather than mix brands mid-workflow; Space Arc, as an authorised distributor for both MC-Bauchemie and Fosroc, specs whichever complete system suits the crack width, movement and budget.

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