MasterFlow 648
Three-component, solvent-free epoxy precision grout for aligning and supporting critical machinery under static and dynamic loads.
MasterFlow 648 at a glance
The essentials specifiers and contractors ask first — answered straight from the product data, with links to go deeper.
What is it?
MasterFlow 648 is a three-component epoxy resin-based precision grout from Master Builders Solutions (formerly BASF Construction Chemicals; the product was earlier sold as MasterFlow 648 CP Plus). It pairs a resin and hardener with a graded aggregate to secure critical equipment and transmit both static and dynamic loads into the foundation.
Where is it used?
It is used under industrial turbines, generators, compressors, large reciprocating compressors, rolling/stamping/grinding/finishing mills, forging hammers, crane and rail tracks and paper-machine sole plates, typically in oil and gas, petrochemical, power, steel, pulp-and-paper and mining plants.
Why use it?
High early and ultimate compressive strength, low creep, very low shrinkage and a high effective bearing area keep precision machinery in alignment, while strong chemical resistance and retention of properties at elevated temperature suit it to aggressive, vibration-heavy industrial duty.
How is it applied?
The hardener is blended into the resin, then the pre-bagged aggregate is added and mixed to a uniform consistency; the grout is poured or pumped from one side into a formed, head-boxed cavity in lifts of 10 to 150 mm. Full cure is reached in about 7 days at 23 degC, and uncured material cleans up with soap and water or a citrus degreaser.
Key advantages
- High early and 7-day compressive strength allows rapid load transfer and fast equipment commissioning
- Low creep under sustained load keeps precision machinery in alignment over its service life
- Very low shrinkage and high effective bearing area give full baseplate contact and even load distribution
- Retains mechanical properties at elevated service temperatures, widening the operating range
- Excellent adhesion to steel and concrete with effective vibration and torque dampening
- Good resistance to a wide range of industrial chemicals, water and chloride intrusion
- Variable fill ratio lets one product be tuned for thin pours or deeper, longer-travel placements
- Low-dusting, solvent-free, pourable or pumpable, with simple soap-and-water cleanup of uncured grout
Specifications
- Chemical base: Epoxy resin (three-component: resin + hardener + graded aggregate), solvent-free, grey (Master Builders Solutions TDS, Aug 2022)
- Compressive strength (ASTM C579, 50x50 mm cubes): 1 day >=72 N/mm2; 7 days >=97 N/mm2 (Master Builders Solutions global/UK TDS)
- Compressive strength (EN 12190 prisms, 1:6.7 at 23 degC): 1 day >=75 N/mm2; 3 days >=85 N/mm2; 7 days >=95 N/mm2 (high-flow 1:5 at 23 degC: 7 days >=70 N/mm2)
- Flexural strength (EN 12190, 7 days, 1:6.7 at 23 degC): >=30 N/mm2 (high-flow 1:5: >=25 N/mm2); ANZ TDS quotes 31 MPa standard / 28 MPa high-flow (ASTM C880)
- Elasticity (flexural) modulus, 7 days: Standard 1:6.7 >=15,000 N/mm2 (15.0 GPa); high-flow 1:5 >=12,000 N/mm2 (12.0 GPa) (EN 13412)
- Effective bearing area (ASTM C1339): >=85% (Master Builders Solutions global/UK and ANZ TDS)
- Flow time (ASTM C1339): Full plate contact <20 min; to back of box <30 min
- Creep (EN 1544, tensile load 50 kN, 3 months): <=0.6 mm; low creep maintains alignment under sustained load
- Coefficient of thermal expansion (EN 1770, 7 days): 3.7 x 10-5 /K (ANZ TDS: ~34 x 10-6 cm/cm/degC standard, ~41 x 10-6 high-flow)
- Glass transition temperature (EN 12614): +80 degC
- Chloride ion content: <=0.05% (per CE / EN 1504-6 declaration)
- Fresh mortar density: approx. 2.0 g/cm3 at 1:6.7 fill ratio; approx. 1.75 g/cm3 at 1:5 (high-flow)
- Fill ratio (resin+hardener : aggregate): Standard ~1:6.7 (4 aggregate bags/set) down to high-flow ~1:5 (3 bags/set)
- Layer / pour thickness: 10 mm minimum to 150 mm maximum per lift (use head box below ~25 mm; deeper sections need reinforcement or MasterFlow 678)
- Application temperature: +10 degC to +30 degC (ambient and substrate)
- Working time: ~50-60 min at 30 degC; ~90-120 min at 23 degC; ~120-150 min at 10 degC
- Full cure: ~7 days at a constant 23 degC
- Coverage / yield: Standard 1:6.7 unit (1xA + 1xB + 4xC, ~114.9 kg) yields ~57.5 litres; high-flow 1:5 (3 bags) yields ~51.5 litres
- Packaging (set): Part A ~11.35 kg + Part B ~3.55 kg + Part C 4 x 25 kg bags; components also sold separately
- Storage / shelf life: Store out of direct sunlight in cool, dry conditions, protected from frost; 24 months for Parts A, B and C
- Cleanup: Uncured grout: soap and water or a citrus degreaser; cured grout: mechanical removal only
- Standards / certification: Meets EN 1504-6 (concrete anchoring product, Principle 4.2); CE marked. Test methods per ASTM C579/C1339 and EN 12190/13412/1770/1544/12614
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About MasterFlow 648
A plain-language overview of what MasterFlow 648 is, the problem it solves and how Space Arc Engineering positions it in a specification.
MasterFlow 648 is a precision epoxy grout engineered for the demanding job of locking heavy rotating and reciprocating machinery to its foundation. Unlike cementitious grouts, it is a three-part system supplied as a resin (Part A), a hardener (Part B) and a graded aggregate (Part C). On site the resin and hardener are combined first, then the aggregate is folded in; the amount of aggregate can be varied to tune flow, which lets the same product run thin under a tight baseplate or fill a deeper, larger cavity without segregating.
The grout is designed for full, continuous baseplate contact. Master Builders Solutions specifies a high effective bearing area and very low shrinkage so that the load path from machine to foundation is uninterrupted, which is what keeps a compressor or turbine in alignment over years of vibration, torque and thermal cycling. It pours or pumps in thicknesses from roughly 10 mm up to 150 mm in a single lift, and the European version carries CE marking to EN 1504-6 as a concrete anchoring product.
As a distributor, Space Arc supplies MasterFlow 648 in its factory-proportioned units and supports specifiers and contractors with the current technical data sheet, fill-ratio guidance and on-site application advice. Because this is a high-value, engineered grout used under critical assets, we recommend confirming the exact grade, fill ratio and certified data against the latest TDS for the project before ordering.
The technical insight
Why MasterFlow 648 behaves the way it does — the mechanism behind the performance, in specifier-friendly terms.
MasterFlow 648 develops strength through an epoxy crosslinking reaction between the resin and hardener; the graded aggregate is the structural filler that carries compressive load and controls the coefficient of thermal expansion and exotherm. Because the binder is a thermoset epoxy rather than a hydraulic cement, the grout is effectively non-shrink on cure, bonds tenaciously to both steel and concrete, and resists water, chlorides and a wide range of industrial chemicals. Its low creep under sustained load is the property that matters most for precision alignment: a baseplate set on this grout stays where it was shimmed instead of slowly deflecting.
The variable fill ratio is the product's defining feature. At the standard ratio of about 1:6.7 (resin-and-hardener to aggregate, four aggregate bags per set) the mix is stiffer and most economical; dropping to a high-flow ratio of about 1:5 (three bags per set) increases flowability for thin pours or long travel distances, at a modest reduction in compressive strength and modulus. Master Builders Solutions notes that, unlike many epoxy grouts, MasterFlow 648 holds a high bearing area even as the fill ratio is reduced, so flow can be improved without sacrificing the load-bearing contact that the application depends on.
Where MasterFlow 648 is used
Typical applications MasterFlow 648 is specified for, supplied by Space Arc Engineering across Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
- Precision alignment and grouting of industrial turbines, generators and compressors
- Foundations and sole plates under large reciprocating compressors and prime movers
- Grouting of rolling, stamping, grinding, drawing and finishing mills subject to high torque and impact
- Grouting under forging hammers and other shock- and vibration-loaded equipment
- Crane-rail and rail-track grouting in heavy industry
- Paper-machine sole-plate grouting in pulp and paper plants
- Setting and bedding of machinery requiring high strength and maximum bearing area
Key advantages
The properties that make MasterFlow 648 the right choice — drawn from the manufacturer's product literature.
- High early and 7-day compressive strength allows rapid load transfer and fast equipment commissioning
- Low creep under sustained load keeps precision machinery in alignment over its service life
- Very low shrinkage and high effective bearing area give full baseplate contact and even load distribution
- Retains mechanical properties at elevated service temperatures, widening the operating range
- Excellent adhesion to steel and concrete with effective vibration and torque dampening
- Good resistance to a wide range of industrial chemicals, water and chloride intrusion
- Variable fill ratio lets one product be tuned for thin pours or deeper, longer-travel placements
- Low-dusting, solvent-free, pourable or pumpable, with simple soap-and-water cleanup of uncured grout
Limitations & considerations
Where MasterFlow 648 is not the right answer. Check these constraints from the manufacturer before specifying — using it outside its scope is the most common cause of failure.
- Apply only within the ambient and substrate temperature window of about +10 degC to +30 degC; cold material flows poorly and gains strength slowly, and pours below the minimum thickness need a head box
- Single-lift thickness is limited to roughly 150 mm; deeper sections call for steel reinforcement or an alternative such as MasterFlow 678, and thick or complex geometries should be referred to the manufacturer
- As a thermoset epoxy it is sensitive to thermal cracking at exposed shoulders and edges; chamfer edges, anchor any shoulders and avoid them where possible
- Substrate must be sound, dry and clean (steel to about SA 2.5); it will not bond reliably over oil, laitance, curing membranes, frost or standing water
- Do not vibrate the grout, do not add solvent or water, and do not alter the resin-to-hardener proportions; severe chemical exposure can discolour the surface (without loss of strength). For wind-turbine bases, Master Builders Solutions now directs users to its MasterFlow 9000-series grouts
Selection & best practice
How to decide whether MasterFlow 648 fits your job — and how to apply it so the repair lasts.
Specify MasterFlow 648 when machinery must hold precise alignment under dynamic load, vibration, torque, elevated temperature or chemical attack, and where a cementitious grout would creep or lack chemical resistance. Choose the standard fill ratio for the strongest, most economical mix and step down toward the high-flow ratio only when thin sections or long flow distances demand it. For single-lift sections deeper than about 150 mm, or for wind-turbine tower bases, move to a deep-pour or 9000-series grout instead. For non-critical levelling and bedding where these performance demands are absent, a quality cementitious non-shrink grout is usually the more cost-effective choice.
Application best practice
- Prepare the concrete to a sound, clean, dry, chipped surface free of laitance, oil and curing compounds, and clean steel baseplates to about SA 2.5; ensure bolt holes are dry
- Condition components and substrate within +10 degC to +30 degC; shade baseplates and foundations in hot weather and warm them above 10 degC in cold weather
- Use formwork that is secure and watertight with a head box, keeping about 100 mm clearance on the pour side and 50 to 100 mm on the far side, and maintain a hydrostatic head of at least 150 mm
- Mix hardener fully into the resin first (about 3 minutes), then add the aggregate to a uniform consistency; select the fill ratio from the TDS table using foundation and plate temperature as the governing input
- Pour continuously from one side only to avoid trapping air, make the leading batch slightly more fluid to lubricate the path, and never use a vibrator to place the grout
- Chamfer exposed concrete edges and follow the working-time limits for the placement temperature to reduce the risk of thermal cracking
Specifications
Indicative properties from the manufacturer's literature. Always confirm batch-specific values against the current TDS before specification.
| Chemical base | Epoxy resin (three-component: resin + hardener + graded aggregate), solvent-free, grey (Master Builders Solutions TDS, Aug 2022) |
|---|---|
| Compressive strength (ASTM C579, 50x50 mm cubes) | 1 day >=72 N/mm2; 7 days >=97 N/mm2 (Master Builders Solutions global/UK TDS) |
| Compressive strength (EN 12190 prisms, 1:6.7 at 23 degC) | 1 day >=75 N/mm2; 3 days >=85 N/mm2; 7 days >=95 N/mm2 (high-flow 1:5 at 23 degC: 7 days >=70 N/mm2) |
| Flexural strength (EN 12190, 7 days, 1:6.7 at 23 degC) | >=30 N/mm2 (high-flow 1:5: >=25 N/mm2); ANZ TDS quotes 31 MPa standard / 28 MPa high-flow (ASTM C880) |
| Elasticity (flexural) modulus, 7 days | Standard 1:6.7 >=15,000 N/mm2 (15.0 GPa); high-flow 1:5 >=12,000 N/mm2 (12.0 GPa) (EN 13412) |
| Effective bearing area (ASTM C1339) | >=85% (Master Builders Solutions global/UK and ANZ TDS) |
| Flow time (ASTM C1339) | Full plate contact <20 min; to back of box <30 min |
| Creep (EN 1544, tensile load 50 kN, 3 months) | <=0.6 mm; low creep maintains alignment under sustained load |
| Coefficient of thermal expansion (EN 1770, 7 days) | 3.7 x 10-5 /K (ANZ TDS: ~34 x 10-6 cm/cm/degC standard, ~41 x 10-6 high-flow) |
| Glass transition temperature (EN 12614) | +80 degC |
| Chloride ion content | <=0.05% (per CE / EN 1504-6 declaration) |
| Fresh mortar density | approx. 2.0 g/cm3 at 1:6.7 fill ratio; approx. 1.75 g/cm3 at 1:5 (high-flow) |
| Fill ratio (resin+hardener : aggregate) | Standard ~1:6.7 (4 aggregate bags/set) down to high-flow ~1:5 (3 bags/set) |
| Layer / pour thickness | 10 mm minimum to 150 mm maximum per lift (use head box below ~25 mm; deeper sections need reinforcement or MasterFlow 678) |
| Application temperature | +10 degC to +30 degC (ambient and substrate) |
| Working time | ~50-60 min at 30 degC; ~90-120 min at 23 degC; ~120-150 min at 10 degC |
| Full cure | ~7 days at a constant 23 degC |
| Coverage / yield | Standard 1:6.7 unit (1xA + 1xB + 4xC, ~114.9 kg) yields ~57.5 litres; high-flow 1:5 (3 bags) yields ~51.5 litres |
| Packaging (set) | Part A ~11.35 kg + Part B ~3.55 kg + Part C 4 x 25 kg bags; components also sold separately |
| Storage / shelf life | Store out of direct sunlight in cool, dry conditions, protected from frost; 24 months for Parts A, B and C |
| Cleanup | Uncured grout: soap and water or a citrus degreaser; cured grout: mechanical removal only |
| Standards / certification | Meets EN 1504-6 (concrete anchoring product, Principle 4.2); CE marked. Test methods per ASTM C579/C1339 and EN 12190/13412/1770/1544/12614 |
Coverage, dosage, pack sizes and cure times vary with substrate and conditions — request the full TDS for certified technical data.
Industry use cases
Real-world scenarios where MasterFlow 648 is the practical choice — the teams who reach for it and the jobs it does for them.
- Oil, gas and petrochemical plants: aligning reciprocating and centrifugal compressors and pumps under continuous vibration
- Power generation: bedding turbines, generators and large rotating equipment for sustained precise alignment
- Steel and metals: supporting rolling, stamping and grinding mills and forging hammers under high impact and torque
- Pulp and paper: grouting paper-machine sole plates where chemical exposure and dynamic load coincide
- Materials handling and infrastructure: crane-rail and rail-track grouting and heavy machinery anchoring
Frequently asked questions
Common questions about specifying and sourcing MasterFlow 648.
What is MasterFlow 648 and what makes it different from a cement grout?
It is a three-component epoxy precision grout (resin, hardener and graded aggregate) from Master Builders Solutions. Unlike cementitious grouts, the epoxy binder is effectively non-shrink, bonds strongly to steel and concrete, resists chemicals and creep, and is built to hold precision machinery in alignment under dynamic load.
What compressive strength does it reach?
Per the current Master Builders Solutions TDS, ASTM C579 compressive strength is at least 72 N/mm2 at 1 day and at least 97 N/mm2 at 7 days; EN 12190 prism testing at the standard 1:6.7 fill ratio gives roughly 75 N/mm2 at 1 day rising to about 95 N/mm2 at 7 days. High-flow mixes are slightly lower. Request the project-specific TDS for the certified figures.
What is the effective bearing area?
The Master Builders Solutions TDS specifies an effective bearing area of at least 85% to ASTM C1339, and the product is designed to hold a high bearing area even when the fill ratio is reduced for better flow. High bearing area is what gives even load transfer from machine to foundation.
What thickness can be poured, and what about deep sections?
It pours or pumps in lifts from about 10 mm up to 150 mm. Below roughly 25 mm a head box is used to drive flow. For single sections deeper than about 150 mm, Master Builders Solutions recommends steel reinforcement or an alternative such as MasterFlow 678; refer thick or complex geometries to the manufacturer.
What is the fill ratio and why does it matter?
Fill ratio is the weight of aggregate relative to the combined resin and hardener. The standard ratio is about 1:6.7 (four aggregate bags per set) for the strongest, most economical mix; reducing to about 1:5 (three bags) gives a high-flow mix for thin pours or long flow distances, with a modest drop in strength and modulus. Foundation and plate temperature should govern the ratio chosen.
What are the temperature and working-time limits?
Apply within an ambient and substrate range of +10 degC to +30 degC. Working time is about 50-60 minutes at 30 degC, 90-120 minutes at 23 degC and 120-150 minutes at 10 degC, with full cure in roughly 7 days at 23 degC. Cold material flows poorly and gains strength slowly.
How is it stored, and how is equipment cleaned?
Store the components out of direct sunlight in cool, dry conditions and protect the resin from frost; shelf life is 24 months. Remove uncured grout from tools with soap and water or a citrus degreaser; once cured it can only be removed mechanically.
References
Manufacturer and technical sources this page draws on. Always confirm current data against the live TDS before specification.
- https://assets.ctfassets.net/ctspkgm1yw3s/DMSY-1685695220-128848/14a07467ed717122765ebc49102ab1fb/masterflow-648-tds.pdf
- https://chockfast.si/uploads/masterflow-648-tds.pdf
- http://www.mullerconstructionsupply.com/wp-content/uploads/2016/01/basf-masterflow-648-tds.pdf
- https://catalog.formtechinc.com/products/grouts/groutsepoxy/masterflow-648/
- https://www.master-builders-solutions.com/en-au
Source MasterFlow 648 for your project
Space Arc Engineering is an authorised distributor for Master Builders Solutions, serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh. Talk to us for pricing, the technical data sheet and on-site support.
Or email info@space-arc.com · www.space-arc.com