Cromar Alphachem Polyurethane FC40, formerly known as Polyflex HM, is a single component, fast curing, polyurethane based elastomeric sealant used for joints where a highly elastic strong bond is required, with excellent chemical, mechanical and weather resistance. Suitable for use with PROGRP, Flexiglass and Elastathane Extreme Roofing systems.

Specially developed for bonding various building materials and for sealing of expansion joints. As a sealant it adheres, without a primer, to the substrates such as wood, concrete, stone, anodized aluminium, polyester, glass, ceramics, baked clay. Overpaintable*

*Cromar recommend on solvent based paints that tests are carried out before hand to ascertain compatibility.

Ideal for:

• All sealing and bonding applications in the building and construction industry
• Sealing expansion joints in concrete floors
• Trafficked floor joints

CE Marked to EN15651 F-EXT-INT-CC and EN15651-4 PW-EXT-INT-CC

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• Features & Benefits
• Priming
• Substrate Preparation
• Application
• Storage
• Shelf Life
• Limitations
• Technical Data

Features & Benefits

• Formerly known as Polyflex HM
• Single component
• Fast curing
• Polyurethane based elastomeric sealant
• Used for joints where a highly elastic strong bond is required
• Excellent chemical, mechanical and weather resistance
• Suitable for use with PROGRP, Flexiglass and Elastathane Extreme Roofing systems
• Specially developed for bonding various building materials and for sealing of expansion joints
• All sealing and bonding applications in the building and construction industry
• Sealing expansion joints in concrete floors
• Trafficked floor joints
• Adheres, without a primer, to substrates including:
• Wood
• Concrete
• Stone
• Anodized aluminium
• Polyester
• Glass
• Ceramics
• Baked clay
• Overpaintable
• Compatibility test beforehand for solvent paints recommended
• CE Marked to EN15651 F-EXT-INT-CC and EN15651-4 PW-EXT-INT-CC

Priming

• Adheres without primer on most commonly used substrates such as wood, anodized aluminium, polyester, glass, concrete, baked clay, stone and ceramic tiles.
• For difficult materials such as plastics (PVC, ABS, PMMA) or materials such as raw aluminium or lacquered metal perform preliminary tests to determine whether surface preparation is necessary.

Substrate Preparation

• Ensure surfaces to be bonded are clean, sound, dry and free from dust, grease or other contaminants which could harm the bonding process. If the substrates need to be cleaned use methylethylketone (MEK) or acetone. For surfaces sensitive to ketones use ethanol. Make sure to check their compatibility with the substrates first.
• If necessary, apply a primer.
• It is recommended to rub down concrete, particularly cement film residue, with a metal brush. After scraping remove the dust.
• If necessary, rub down metallic surfaces beforehand (especially in presence of oxidation).
After rubbing down, clean them with a solvent and allow to dry for at least 10 minutes.
• Note: when using solvents, extinguish all sources of ignition and carefully follow the safety and handling instructions given by the manufacturer.

Application

• Cut thread and then the nozzle to the required size.
• Apply with an Alpha Chem professional heavy duty sealant gun.
• For tooling down, apply light pressure, using a wetted spatula or gloved finger.
• When bonding, ensure the bond is made before a skin has formed.
• Excess uncured product may be cleaned with Cromar Alpha Chem Grafters Wipes. Cured product can be removed mechanically.
• It is the user’s responsibility to dispose of all packaging correctly.

Please note: This product should be used within 24 hours which follow the opening of the packaging; otherwise, the sealant could cure.

Storage

The product should be stored unopened in a dry condition at a temperature of 5-25°C. In cold weather store the product at around 20°C before use. Keep out of the reach of children.

Shelf Life

12 months when stored as directed.

Limitations

• Do not apply at a temperature below 5°C.
For difficult materials, including plastics such as PVC, ABS, PMMA, or materials such as raw aluminium or lacquered metal, perform preliminary tests to determine whether a surface preparation is necessary.
• Avoid any contact with non-cured MS, hybrid PU or silicone sealants as well as with alcohols or ammonia during curing.
• Cromar recommend on solvent based paints that tests are carried out before hand to ascertain compatibility.
• It is the user’s responsibility to ensure suitability for use.

Technical Data

** this time depends on the hygrometry and ambient temperature. In order to ensure good adhesive it is mandatory to do the bonding before the skin has formed.