Description
Cold weather and tight schedules are where most stone adhesives fall apart. Bonstone Ultimate MPH is a two-component, UV-stable structural adhesive built for anchoring, mitering, and laminating when the shop or jobsite is cold and the joint needs to hold. Knife-grade viscosity stays where you put it on vertical and overhead work. Sets in 15 minutes, full cure in 2 hours, and it will adhere in areas between 40°F and 50°F (4 to 5°C).
Key Features
- Cold-weather adhesion: adheres in areas between 40°F and 50°F (4 to 5°C). Bonstone notes the product cures even at below-freezing temperatures.
- Fast cure: 15-minute set time, 2-hour cure time.
- UV stable: will not yellow on exterior exposure to sunlight. Non-staining and non-bleeding.
- Knife-grade: holds position on vertical and horizontal joints.
- Adheres to porous stone, concrete, and metal.
- Low odor for shop and interior work.
Color Options
Ultimate MPH is available in Buff and Gray. Both cure to a light, low-contrast joint line on natural stone.
Common Applications
- Anchoring stone and architectural components
- Bonding stone to stone, concrete, and metal
- Mitering countertops, panels, and trim
- Laminating limestone
- Interior and exterior work, vertical and horizontal
Technical Specifications
| Property | Value | Test Method |
|---|---|---|
| Product Type | Urethane | |
| Viscosity | Knife-grade | |
| Mix Ratio | 2:1 by volume (two parts A to one part B) | |
| Pot Life | 6 minutes | |
| Set Time | 15 minutes | |
| Cure Time | 2 hours | |
| Application Conditions | Interior, exterior, vertical, horizontal | |
| Recommended Application Temp | 75°F (24°C) | |
| Minimum Component Temp Before Mixing | 45°F (7°C) | |
| Coverage | 50 mils (1/16 in) at 30 sq ft, or 231 cu in | |
| Tensile Strength | 4,310 psi | ASTM D-638 |
| Compressive Strength | 7,137 psi | ASTM D-695 |
| Tensile Modulus | 368,333 psi | ASTM D-638 |
| Compressive Modulus | 125,313 psi | ASTM D-638 |
| Flexural Modulus | 474,401 psi | ASTM D-790 |
| Elongation at Break | 0.93% | ASTM D-638 |
| Shore D Hardness | 82 | ASTM D-1706 |
| Available Colors | Buff, Gray | |
| Shelf Life | Approximately one year unopened, stored dry at 75°F (24°C) |
Working Notes
- Pot life is 6 minutes. Bonstone recommends mixing only what can be used in 5 minutes.
- If the mixed material gets very warm in the container, do not use it. It is too close to gel stage and adhesion will suffer.
- Substrate must be completely dry, dust free, and free of oil, grease, and coatings.
- Mix thoroughly. Components must be blended homogeneously for proper cure.
- Avoid stressing the joint before full cure.
- Clean uncured material from tools with toluene or xylene. Both are flammable, so ventilate. Cured epoxy has to come off mechanically.
- Mask any surface that needs to stay clean. Wear gloves and eye protection, and a dust mask when grinding cured joints.
Packaging and Dispensing
| Size | Kit Contents | Dispensing |
|---|---|---|
| 180ml Cartridge | Cartridge | Manual Single Cartridge Gun, Large Pro-Tip Nozzle |
| Pint (473ml) | 1 pint A plus (8) 1 oz tubes B | Hand mix |
| Quart (946ml) | 1 quart A plus (3) 5 oz tubes B | Hand mix |
| Gallon (3,785ml) | 1 gallon A plus 2 quarts B | Hand mix |
Frequently Asked Questions
What temperature can Bonstone Ultimate MPH be applied at?
Ultimate MPH will adhere in areas between 40°F and 50°F (4 to 5°C), and Bonstone notes it cures even at below-freezing temperatures. The recommended application temperature is 75°F (24°C), and unmixed components should be at or above 45°F (7°C) before mixing.
What is the mix ratio for Bonstone Ultimate MPH?
2:1 by volume, two parts A to one part B. Mix thoroughly until the material is a uniform color with no streaking.
How much working time does Ultimate MPH give you?
Pot life is 6 minutes, so mix only what you can use in about 5 minutes. Set time is 15 minutes and cure time is 2 hours.
What colors does Bonstone Ultimate MPH come in?
Buff and Gray. Both cure to a light, low-contrast color that blends with most natural stone.
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