STP ShaliGrout EP 20
A high-strength, three-component epoxy grout built to bed machinery, pumps and turbine bases from wafer-thin shims to deep pours, holding alignment where vibration and dynamic loads never stop.
What is it?
A three-component (resin, hardener, graded aggregate) high-strength epoxy grout from STP, formulated for machine and equipment base plates across both thin and thick sections.
Where is it used?
Under pumps, motors, compressors, turbines and gearbox base plates in process plants, power stations, cement works and heavy industrial workshops.
Why use it?
It is non-shrink, resists oils and industrial chemicals, and transfers vibration and dynamic loads into the foundation while keeping precision alignment intact.
How is it applied?
Mix the three components on site to a flowable consistency, then pour or pump into the prepared gap between base plate and foundation in a continuous head.
About STP ShaliGrout EP 20
STP ShaliGrout EP 20 is a three-component epoxy grouting system that STP positions for the grouting of machine and equipment bases of every type, engineered so a single product serves both thin shim gaps and deep structural pours. Supplied as a base resin, a liquid hardener and a pack of specially graded inert aggregate, the three parts are blended on site into a self-levelling, flowable grout that is poured or pumped into the void beneath a base plate. Once cured, it forms a dense, high-strength, non-shrink matrix that bonds tightly to both the steel base plate and the concrete foundation, giving the near-100 percent effective bearing area that rotating and reciprocating equipment demands.
The reason engineers reach for an epoxy grout rather than a cementitious one comes down to what happens under load. Machinery bases live with vibration, impact, thermal cycling and the occasional spill of oil, coolant or process chemicals, and a cement grout can micro-crack, creep or debond over time in that environment. ShaliGrout EP 20 carries these dynamic and mobile loads without shrinking away from the plate, resists the industrial fluids that would attack lesser materials, and stays dimensionally stable across its service temperature range. For a distributor-applicator like Space Arc, that makes it a dependable specification for the kind of alignment-critical installations where re-grouting a machine is expensive and downtime is worse.
The technical insight
The performance of an epoxy machine grout is really a story about bearing area and shrinkage. When a base plate sits on a cementitious grout, drying shrinkage and creep gradually reduce the contact between plate and grout, so the load concentrates on a few high spots and the machine loses the uniform support it was aligned on. STP’s three-component epoxy chemistry sidesteps this: the resin and hardener cure by chemical reaction rather than by losing water, so there is effectively no drying shrinkage, and the graded aggregate fraction keeps the mix dense while limiting the heat and movement that a neat resin would generate on a deep pour. The cured system develops far higher compressive, tensile and flexural strength than concrete, together with strong bond and impact resistance, so vibration energy from the running machine is transmitted straight into the foundation instead of loosening the grout. STP’s epoxy-grout range is formulated to the intent of standards such as ASTM C 827 (early volume change), ASTM C 579 (compressive strength of chemical-resistant mortars) and ASTM C 884 (thermal compatibility with concrete), which is exactly the property set that keeps a precisely aligned base plate precisely aligned once the plant is commissioned and running.
Where it is used
- Grouting of pump, motor and compressor base plates in process and utility plants
- Bedding of turbine, generator and large rotating-equipment foundations
- Mounting of gearboxes, blowers and fans subject to continuous vibration
- Fixing of crane rails, rolling-mill stands and other heavy-load track systems
- Anchoring of large holding-down bolts, dowels and keyways in equipment foundations
- Precision alignment grouting where a near-100 percent bearing area is specified
- Re-grouting of machinery after repositioning, overhaul or foundation repair
- Grouting in areas where oil, coolant or chemical spillage is expected around the base
Key advantages
- Non-shrink cure maintains full bearing contact between base plate and foundation
- High compressive, tensile and flexural strength, well above ordinary concrete or cement grout
- Single system pours from thin shim gaps through to thick, deep sections
- Resists oils, coolants and a broad range of industrial chemicals
- Excellent bond to both steel base plates and concrete foundations
- Transmits vibration and dynamic loads into the foundation without loosening
- Dimensionally stable under thermal cycling and sustained bearing pressure
- Flowable, self-levelling consistency reaches fully under congested base plates
Limitations & considerations
- Three-part epoxy chemistry costs more than cementitious grout and suits load-critical bases, not general fills
- Pot life is limited once mixed, so placement must be planned and continuous, especially in hot weather
- Substrate must be a minimum age, clean, sound and mechanically prepared, or bond will suffer
- Deep single pours generate exotherm and need lift-thickness and pour rate managed per the TDS
- Cold conditions slow the cure and may require the material and substrate to be warmed
- Not intended as a decorative floor topping or as a structural crack-injection resin
Selection & best practice
Confirm the substrate first: the concrete foundation should be well cured, clean, sound and roughened by scabbling, bush-hammering or shot-blasting to expose the aggregate, and the steel base plate must be free of oil, rust and scale. Blow or vacuum out all debris and keep the gap dry. Build a leak-tight, well-braced shutter around the plate with a header box on the pouring side high enough to give a positive hydrostatic head, and provide vent and air-relief points at the far edges. Mix the full base and hardener together first, then add the entire aggregate pack in a forced-action mixer until uniform, and never split a unit by eye. Pour or pump from one side only, in a continuous flow, so the grout advances as a single front and pushes air ahead of it rather than trapping it. Respect the pot life, work faster in hot conditions, and for deep sections follow the TDS on maximum lift thickness. Leave the shutter in place until the grout has gained strength, then trim the surplus. Always work to the current STP technical data sheet for mixing ratios, pack yield, pot life and pour limits.
Specifications
| Product Type | Three-component epoxy grout (base resin, liquid hardener, graded aggregate) |
| Primary Use | Grouting of machine and equipment base plates, thin to thick sections |
| Shrinkage | Non-shrink |
| Compressive Strength | High; develops well above concrete (refer STP TDS for values) |
| Chemical Resistance | Resistant to oils and a range of industrial fluids |
| Standards Referenced | STP epoxy-grout range formulated to the intent of ASTM C 827 / C 579 / C 884 |
| Bond | Excellent adhesion to steel base plates and concrete foundations |
| Temperature | Dimensionally stable across service temperature range; heat-resistant matrix |
| Consistency | Flowable, self-levelling; pour or pump placement |
Industry use cases
Power & Utilities
Bedding turbine, generator and boiler-feed-pump bases where continuous vibration and precise alignment cannot be compromised.
Cement & Minerals
Grouting crushers, mills, fans and large motor bases in dusty, high-load plant environments that punish cementitious grouts.
Chemical & Process
Mounting pumps and compressors in areas exposed to oil and chemical spillage, where the grout must resist attack and stay bonded.
Heavy Manufacturing
Fixing presses, forging hammers, rolling-mill stands and machine tools that transmit heavy impact and dynamic loads to their foundations.
Infrastructure & Ports
Grouting crane rails, gantry bases and large anchor-bolt pockets that carry moving and repetitive loads over long service lives.
Frequently asked questions
Is ShaliGrout EP 20 an epoxy or a cement grout?
Can I use the same product for both thin and thick sections?
Why choose an epoxy grout over a cheaper cement grout for a machine base?
How is it placed under a base plate?
What surface preparation does it need?
Does Space Arc supply and apply ShaliGrout EP 20 across India?
How we position STP ShaliGrout EP 20
ShaliGrout EP 20 sits at the machine-base end of STP’s grout range. Where the gap is a fine, low-viscosity injection into cracks or narrow sections rather than a base-plate pour, ShaliGrout EI or ShaliGrout EI LP (two-component epoxy injection grouts) are the correct call, while ShaliGrout EP 10 and EP 10 M cover heavy vibratory equipment bases in the same three-component family; for shrinkage-compensated cementitious grouting of larger, less aggressive foundations, a ShaliGrout cementitious grade is the more economical route. Across our other brands the direct equivalents are Fosroc Conbextra EPR and the Conbextra EP thickness-graded series, and Sika’s SikaGrout epoxy range, any of which we can specify where a client standardises on a particular brand.
Fosroc Conbextra EPR — A specifier standardised on Fosroc, or one needing a documented free-flow epoxy grout for base-plate gaps of roughly 10 to 120 mm under dynamic loads, may prefer Conbextra EPR as the direct counterpart.
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