Product details
| Grade | Loctite MR 2000 |
| Strength | High strength putty |
| Colour | Grey |
| Family | Other Loctite products |
| Brand | Loctite (Henkel) |
| Stock | Held in Dubai — buy one or bulk |
Pack sizes
Prices on request. Tell us the quantity you need.
Check stockWhat Loctite MR 2000 is for
The extreme-temperature putty — it withstands 1,000°C, roughly five times what the EA-series epoxies manage. It is a one-part, water-based silicic acid compound: non-toxic, non-flammable, and containing no solvents or volatile compounds, which matters in an enclosed space. Typical work is boiler doors and casings, exhaust stacks, flanges, refractory brick and ceramic tile, moulds, crucibles and dies.
Key features
- Withstands environments up to 1,000°C (2,000°F)
- Water based — non-toxic, non-flammable, no solvents or volatile compounds
- One part: no mixing, no measuring
- Cures to a metal finish; can be ground, sanded, drilled, tapped and machined
- Excellent adhesion to cast iron, cast aluminium and carbon steels
- 88 Shore D hardness
- Air dries in 5–7 hours at 25°C
- Coverage 620 cm² at 2.5 mm thick per 225 g
Typical applications
- Furnace repair
- Extreme heat sealing
Technical data
Uncured material
| Technology | Water-based adhesive |
| Chemical type | Silicic acid |
| Appearance | Silver-grey putty |
| Components | One component — requires no mixing |
| Cure | Room temperature or heat cure |
| Specific gravity | 1.54 g/cm³ |
| Cure time at 25°C | 5–7 hours |
| Coverage | 620 cm² at 2.5 mm thick per 225 g |
Cured properties
Cured at 25°C. Note the low shear and compressive figures — this is a heat-resistant repair compound, not a structural rebuild material.
| Shore hardness (ISO 868, Shore D) | 88 |
| Compressive strength (ISO 604) | 2.4 N/mm² (350 psi) |
| Compressive modulus (ISO 604) | 295 N/mm² (42,620 psi) |
| Lap shear, grit-blasted mild steel (ISO 4587) | 2.4 N/mm² (350 psi) |
| Glass transition temperature (ASTM E1640) | 85°C |
| Coefficient of thermal expansion, below Tg | 7 × 10⁻⁶ K⁻¹ |
| Abrasion resistance (ASTM D4060, CS-10, 1 kg) | 115 mg lost |
| Heat ageing data published at | 65°C, 120°C and 180°C |
Where it is used
| Industrial | Boiler doors and casings, exhaust stacks, defective moulds, crucibles and dies, flanges, sagger plates, refractory bricks, ceramic tiles |
| Automotive exhaust | Headers, manifolds, catalytic converters, exhaust ports |
| Not for | Sealing engine block or cylinder head coolant leaks |
How to use it
- Success depends on a proper bond to the substrate — abrade, clean and dry the surface first.
- Mix thoroughly before use.
- Apply to a maximum thickness of 9.5 mm. For cracks or holes larger than this, apply product, form expanded mesh or screen over it, then apply a second coat to embed the screen.
- Air dry for 5–7 hours.
- Heat cure is not required if the operating temperature exceeds 205°C; otherwise heat cure at 95°C for 3 hours.
- The product shrinks slightly on cure — allow enough material for it.
- Drill, tap or machine only after it is fully cured.
Handling and storage
- Do not apply to hot surfaces. Rapid evaporation traps bubbles and creates voids that spoil performance. Warm surfaces are preferred.
- Not for sealing engine block or cylinder head coolant leaks.
- Not recommended for pure oxygen or oxygen-rich systems.
- Not a sealant for chlorine or other strong oxidising materials.
- Store unopened and dry, ideally 8°C to 21°C.
- Do not return decanted product to the original container.
MR 2000 or an EA-series epoxy?
Choose by temperature, and accept the trade-off. MR 2000 survives 1,000°C but is weak in shear at 2.4 N/mm². The epoxies are far stronger — EA 3478 reaches 134 N/mm² compressive and EA 3471 61.7 — but top out near 105–120°C. For a boiler casing or exhaust stack, only MR 2000 will survive. For a load-bearing rebuild at normal temperatures, use the epoxies. For the highest-temperature flange sealing rather than patching, see Loctite SI 5927 at 315°C.
Always read the current technical and safety data before use —
ask us and we'll send it with your quotation.
