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Mountain Grout Ultra is a moderate-viscosity hydrophobic polyurethane formulation for sealing leaking cracks and joints where some movement is possible. When injected into wet cracks, it reacts with water to produce a closed-cell foam.
What it does
Ultra is used in water-related structures to form an inert, non-toxic permanent seal. Its cured elongation of 300% suits leaking cracks or joints where movement may occur, while the hydrophobic foam maintains its physical form through wet and dry cycles.
The system consists of Ultra base resin and MG Accelerator “B”. The accelerator allows an experienced installer to adjust the reaction profile according to job-site temperature and the amount of moisture encountered.
Numbers that matter
- 650 cps viscosity: Moderate-viscosity base resin that pumps as a single component after the accelerator has been added.
- 300% elongation: Supports use in leaking cracks and joints where some movement is possible.
- Expands up to 25 times: The reacting polyurethane foam can expand up to 25 times its initial volume.
- 224 kg/m³ cured density: Measured in accordance with ASTM D-1622.
- 300 psi tensile strength: Measured in accordance with ASTM D-638.
Adjusting the reaction time
At 25°C, adding MG Accelerator “B” at 1.25%—equivalent to 1/2 pint per five gallons—produces an expansion start time of about 50 seconds and completion in about five minutes after contact with water.
At 25°C, adding MG Accelerator “B” at 2.5%—equivalent to one pint per five gallons—produces an expansion start time of about 30 seconds and completion in about three minutes after contact with water.
Job-site conditions
- The reaction profile is affected by temperature and the amount of moisture encountered.
- MG Accelerator “B” is intended to be used by an experienced installer to adjust the reaction profile before pumping.
- The stated reaction times were determined at 25°C.
How is Mountain Grout Ultra reaction time controlled?
Add MG Accelerator “B” before pumping. At 25°C, 1.25% gives about 50 seconds to expansion start and 5 minutes to completion; 2.5% gives about 30 seconds to start and 3 minutes to completion.
- Wet concrete cracks and joints
- Water-bearing concrete structures
- Rock and civil structures with leaking cracks or joints
Mountain Grout Ultra Physical Properties
| Property | Value |
|---|---|
| Product Type | Hydrophobic polyurethane formulation |
| Available Sizes | 4 kg, 20 kg |
| System Components | Ultra base resin with MG Accelerator "B" |
| Base Resin Viscosity | 650 cps |
| Accelerator Viscosity | 25 cps |
| Base Resin Specific Gravity | 1.07 |
| Accelerator Specific Gravity | 0.95 |
| Base Resin Colour | Pale yellow |
| Accelerator Colour | Clear |
| Base Resin Flash Point | >121°C |
| Accelerator Flash Point | 107°C |
| Cured Density | 224 kg/m³ |
| Cured Elongation | 300% |
| Cured Tensile Strength | 300 psi |
| Cured Toxicity | Non-toxic |
| Solids Content | 100% |
| VOC Content | No VOCs |
| Expansion | Up to 25 times initial volume |
| Foam Structure | Closed-cell foam when injected into wet cracks |
| ASTM D-1638 | Viscosity |
| ASTM D-1475 | Specific gravity |
| ASTM D-92 | Flash point |
| ASTM D-1622 | Cured density |
| ASTM D-638 | Elongation and tensile strength |
| Accelerator Ratio 1 | 1.25% (1/2 pint per five gallons) |
| Reaction Time At 1.25% | Expansion starts in about 50 seconds and is complete in about 5 minutes after encountering water at 25°C |
| Accelerator Ratio 2 | 2.5% (1 pint per five gallons) |
| Reaction Time At 2.5% | Expansion starts at 30 seconds and is complete at about 3 minutes after encountering water at 25°C |