Sika Sikadur-42 MP IN
A pre-batched, three-part solvent-free epoxy grout engineered for high-strength, non-shrink bedding of machine bases, anchors and bearings under sustained vibration.
What is it?
A three-part, solvent-free epoxy grout (resin, hardener and pre-graded filler) that cures to a dense, high-strength, non-shrink bed under machinery and anchors.
Where is it used?
Under compressor, turbine and pump base plates, beneath bridge bearings, and in anchor pockets for crane rails and heavy foundation bolts.
Why use it?
It delivers over 75 N/mm² compressive strength within a day and resists the dynamic, vibrating loads that crack ordinary cementitious grouts.
How is it applied?
Blend the pre-weighed A:B:C parts, then pour into the prepared gap in a single continuous operation to a placed thickness of 25 to 125 mm.
About Sika Sikadur-42 MP IN
Sika Sikadur-42 MP IN is a factory pre-batched, three-component epoxy grout formulated for situations where a cementitious grout simply will not survive. It arrives as a solvent-free system of epoxy resin (Part A), hardener (Part B) and a specially graded quartz filler (Part C), proportioned 5:1:30 by weight so that a site crew mixes complete units without guesswork. Once combined and poured, it hardens into a dense, dimensionally stable mass that grips both the steel base plate above and the concrete foundation below, transferring load evenly across the full bearing area.
The grade suffix MP marks it as the machine-plinth and anchoring variant of the Sikadur-42 family, and the IN designation confirms a formulation balanced for Indian ambient conditions. That matters on site: an epoxy grout poured at 40°C behaves very differently from the same product in a European winter. Sikadur-42 MP IN is built to place and cure predictably in the warm working temperatures common across refineries, power plants and manufacturing floors in India, giving contractors a reliable one-day strength gain even when the shed is hot.
The technical insight
The performance of an epoxy machine grout comes down to how it manages two competing demands: strength and dimensional stability. Sikadur-42 MP IN uses a high loading of graded quartz filler — the 30 parts of Part C against 5 of resin and 1 of hardener — to build a rigid, closely-packed skeleton within the cured matrix. That heavy filler content does two useful things at once. It pushes compressive strength past 75 N/mm² within 24 hours at +30°C and on toward 90 N/mm² by seven days, and it holds the exotherm and shrinkage of the epoxy reaction in check so the poured bed does not pull away from the plate as it sets. The result is intimate, gap-free contact across the entire base plate, which is precisely what lets the grout carry vibrating and impact loads without fatigue cracking. Unlike cement grouts that rely on water and can bleed, settle or dry-shrink, this solvent-free epoxy carries no water to lose, so the placed volume you pour is effectively the volume that stays in service.
Where it is used
- Bedding base plates of compressors, turbines and pumps subject to continuous vibration
- Non-shrink grouting under heavy machinery foundations in refineries and process plants
- Seating bridge bearings and other structural bearing plates
- Filling anchor and holding-down bolt pockets for high-tension fasteners
- Fixing crane rails, transporter rails and light-rail track baseplates
- Precision alignment grouting where load must transfer across the full contact face
- Repair re-grouting of machine plinths where an earlier cement bed has failed
- Grouting of dynamically loaded equipment in electroplating, forging and chemical shops
Key advantages
- High early strength, exceeding 75 N/mm² compressive within one day at +30°C
- Non-shrink cure gives full, gap-free contact under the base plate
- Withstands sustained vibration and impact loading without fatigue cracking
- Solvent-free and moisture-tolerant, so no water is lost from the placed volume
- Pre-batched 21.6 kg units remove site weighing errors and mix-ratio guesswork
- Good resistance to a range of oils, chemicals, acids and alkalis in service
- Single-pour placement up to 125 mm thickness reduces layering and cold joints
- Formulated for warm Indian ambient conditions, giving predictable set on hot sites
Limitations & considerations
- Not a cementitious economy grout — cost per unit is higher, so reserve it for dynamically loaded or critical duty
- Placed thickness is bounded at 25 to 125 mm; thinner films or deeper single pours need a different grade
- Pot life is short, around 45 minutes for a 100 g mass at +30°C, so the pour must be planned and continuous
- Being a filled epoxy it is rigid and not intended for movement or expansion joints
- Substrate and steel must be clean, sound and correctly primed or the bond is compromised
- Rate of strength gain and workable time both shift with temperature and need allowing for on site
Selection & best practice
Success with Sikadur-42 MP IN is mostly about preparation and pace. Roughen and clean the concrete foundation to a sound, laitance-free, dry surface and grit-blast or de-grease the underside of the base plate so nothing interferes with adhesion. Set adequate side and end forms, leaving a clear pour side and a vent side, and allow head to encourage flow across the full footprint. Because the units are pre-weighed, mix a full 21.6 kg unit at a time — resin into hardener first, then the graded filler — using a slow-speed paddle until uniform, and pour immediately in one continuous operation from a single side so trapped air is pushed ahead of the grout rather than sealed under the plate. Work within the pot life; at warm site temperatures that window closes quickly, so stage materials, labour and access before opening any pack. Keep placed layers within the 25 to 125 mm range, and let the grout reach its early strength undisturbed before re-commissioning the machine.
Specifications
| Product type | Three-part, solvent-free epoxy grout |
| Mixing ratio (A:B:C by weight) | 5 : 1 : 30 |
| Compressive strength (1 day, +30°C) | ≥ 75 N/mm² |
| Compressive strength (7 days) | approx. 90 N/mm² |
| Placed layer thickness | 25 – 125 mm |
| Pot life (100 g at +30°C) | approx. 45 minutes |
| Density of placed grout | approx. 2200 kg/m³ |
| Pack size | 21.6 kg unit (A 3.0 kg / B 0.6 kg / C 18.0 kg) |
Industry use cases
Power & Refineries
Bedding compressor, turbine and pump base plates where continuous vibration would fatigue a cement grout, with re-commissioning possible after one-day strength gain.
Infrastructure & Bridges
Seating structural bearing plates and grouting bearing pockets so load transfers cleanly across the full contact face.
Heavy Manufacturing
Anchoring and grouting foundations of presses, forges and dynamically loaded machinery on hot factory floors.
Ports & Material Handling
Fixing crane rails and transporter rails where alignment must hold under repeated impact and rolling loads.
Process & Chemical Plants
Grouting equipment exposed to oils and aggressive chemicals, using the epoxy matrix for its in-service chemical resistance.
Frequently asked questions
What exactly is Sikadur-42 MP IN?
How much compressive strength does it reach and how fast?
What thickness can I pour in one operation?
How long do I have to work with it once mixed?
Why choose it over a cementitious grout?
Can Space Arc supply it and advise on the right grade?
How we position Sika Sikadur-42 MP IN
Within the Sika range, Sikadur-42 MP IN is the workhorse for standard-thickness machine and anchor grouting; where a job calls for very thin bearing gaps or a specialised deep single pour, look to the other reactivity and grade variants in the Sikadur-42 family, and pair the grout with a Sikadur epoxy bonding or anchoring adhesive where dowels and starter bars are involved. For teams that specify across brands, Fosroc’s Conbextra epoxy grout line is the natural cross-reference — Conbextra EP120 in particular covers reciprocating and rotating machinery with a low-exotherm formulation for deeper pours. Space Arc supplies both the Sika and Fosroc systems, so we can specify strictly to a client’s approved brand list rather than pushing a single line.
Fosroc Conbextra EP120 — Choose the Fosroc option when the base plate needs a deeper single pour up to 120 mm under reciprocating or rotating machinery, where its low-exotherm formulation is designed for large-volume placements.
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