Loctite MR 2000 Extreme Temperature Repair Putty 2000F Metal Reapir (#235579) 8oz (237ml)

Product Name: Loctite MR 2000 Extreme Temperature Repair Putty (2000°F Metal Repair)

Loctite MR 2000 is a unique, single-component, water-based repair putty designed for high-temperature environments where standard epoxies would fail. It withstands temperatures up to 2000°F (1093°C), making it a critical repair material for exhaust systems, furnaces, and engine components. Unlike epoxies, this is a "ceramic-like" putty that cures by water evaporation and heat, eventually forming a bond that is chemically resistant and machineable.

Popular Applications & Uses
- Repairing cracks and voids in cast iron and steel parts that operate at high heat.
- Sealing exhaust manifolds, headers, and catalytic converters.
- Patching furnace liners, boilers, and fire bricks.
- Filling defects in castings before powder coating (since it can withstand the oven cure).
- Emergency repairs on steam lines or high-heat ductwork.

Industries that Commonly Use It
- Automotive (Exhaust and engine repair)
- Power Generation (Steam pipes, boilers)
- Metal Casting and Foundry
- HVAC (Furnace repair)
- Industrial Maintenance

Special and Unique Features
- Extreme Temperature Resistance: Survives up to 2000°F (1093°C), far beyond the 500°F limit of high-temp epoxies.
- Water-Based: Safer to use, easy cleanup with water before it cures.
- No Mixing: Single-component putty, ready to use out of the can.
- Machinable: Can be drilled, sanded, and machined once fully cured.
- Environmentally Safe: Contains no solvents or volatile organic compounds (VOCs).

Key Properties
- Base: Silicic Acid (Ceramic/Sodium Silicate based)
- Color: Dark Grey
- Viscosity: Putty / Paste
- Shear Strength: ~675 psi
- Temperature Range: Up to 2000°F (1093°C)
- Cure Type: Air dry + Heat Cure (Requires heat to reach full strength)

Materials Bonded
- Cast Iron
- Carbon Steel
- Stainless Steel
- Aluminum
- Ceramics and Brick

Cure Information
- Work Life: ~30 minutes (skin over time).
- Functional Cure: 7 hours (air dry).
- Full Strength: Requires heat curing (e.g., running the engine or heating with a torch/oven) to fully vitrify and reach maximum strength.

Known backups / known substitutes for this product
- Aremco Pyro-Putty 2400 (Similar high-temp ceramic metallic putty).
- J-B Weld ExtremeHeat (Consumer grade equivalent).
- ThermoSteel (Another common exhaust repair putty).
- Lab-metal (Standard or Hi-Temp versions).

Comparison Note
- Loctite MR 2000 is **NOT an epoxy**. It behaves more like a ceramic clay or cement. It is brittle compared to epoxy and has lower shear strength (675 psi vs 3000+ psi for epoxy), so it should not be used for structural bonds that bear weight. However, for filling a crack in a glowing red-hot exhaust manifold, no epoxy in the world will survive—but MR 2000 will.