Cromar AlphaChem Polyurethane 25 600ml
- Suitable For: sealing and bonding in construction
- Area of use: INT & EXT
- Application Method: barrel gun
- Volume: 600ml
- Container Type: foil
- Type: sealant
- Colour: 2 colours
- Brand: AlphaChem
- Manufactuer: Cromar
- Box Size: 1
Data Sheets
Cromar AlphaChem Polyurethane 25 is a high-performance, single-component, fast-curing polyurethane sealant specifically designed for applications requiring a durable, elastic bond with exceptional weather resistance. Ideal for bonding a variety of construction materials and sealing expansion joints, it forms a reliable seal without the need for a primer and can be overpainted for seamless finishes.
Key Points:
- High Elasticity and Strong Bond: Delivers a highly elastic, resilient bond suitable for demanding joint applications.
- Excellent Weather Resistance: Formulated to withstand exposure to harsh weather conditions.
- Versatile Adhesion: Bonds to numerous substrates, including wood, concrete, stone, anodized aluminum, polyester, glass, ceramics, and baked clay.
- Overpaintable: Can be painted over to achieve a finished look that matches surrounding surfaces.
Storage: Store the product unopened in a dry place at a temperature between 5°C and 25°C. In colder weather, keep the product at approximately 20°C before use. Ensure it is kept out of reach of children.
For more in our range of weatherproof sealants, please click here. For application and finishing tools, please click here.
And for more information on Cromar, you can visit their website here.
Ideal for:
- A wide range of sealing and bonding applications in building and construction.
- Sealing expansion joints in concrete flooring.
Priming
- Adheres without primer to most commonly used substrates, including wood, anodized aluminum, polyester, glass, concrete, baked clay, stone, and ceramic tiles.
- For challenging materials, such as plastics (PVC, ABS, PMMA) or uncoated metals like raw aluminum or lacquered surfaces, perform preliminary tests to determine if surface preparation is needed.
Substrate Preparation
- Ensure surfaces are clean, dry, and free from dust, grease, or contaminants that could impact bonding. For cleaning, use methyl ethyl ketone (MEK) or acetone on surfaces compatible with ketones; use ethanol for sensitive surfaces, being careful to avoid contact with the sealant.
- When using solvents, work in a well-ventilated area, remove any ignition sources, and follow supplier guidelines.
- On concrete surfaces, especially if there is cement residue, use a metal brush to rub down and remove dust.
- For metallic surfaces, remove oxidation if present, clean with a suitable solvent, and allow at least 10 minutes to dry.
Application
- Apply with a suitable foil applicator gun. Use a wetted spatula or putty knife for tooling down, applying light pressure.
- For bonding applications, make the bond before a skin forms on the product.
- Excess uncured product can be removed with Cromar Alpha Chem Grafters Wipes, while cured product may require mechanical removal.
- Dispose of packaging responsibly.
Important Note: Use the product within 24 hours of opening, as it may begin to cure if left exposed.
Limitations
- Do not apply if the temperature is below 5°C.
- For challenging materials, such as plastics (PVC, ABS, PMMA) or uncoated metals like raw aluminum or lacquered metal, conduct preliminary tests to confirm if surface preparation is needed.
- Avoid contact with uncured MS, hybrid PU, or silicone sealants, as well as alcohols or ammonia, during the curing process.
- For solvent-based paints, perform compatibility tests prior to application.
- It is the user’s responsibility to verify suitability for their specific use.
- Always read the label for essential health and safety information; additional details are available in the Safety Data Sheet upon request.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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