As the quality of uPVC; ABS and most plastics vary dramatically, always carry out adhesion tests before full-scale use. Do not use in swimming pools or joints in constant water immersion. Sealing and pointing pre-cast concrete panels pointing to masonry joints and wall joints, Light traffic floor joints.

Everbuild Tecnic Puraflex 25 is a one part low modulus building sealant based on polyurethane technology. Conforms ISO11600 25LM and is CE marked to EN15651-1: 2012 Type F EXT-INT CC. My memory of the MSDS data is that OB1 was essentially the same as CT1 apart from an additional component. I can't remember what it was but did write that I thought it likely to enhance cross-linking to either speed up setting time or strength of the material, probably both (by promoting formation of urethane links). All surfaces must be dry and dust free. Any loose or flaking surface coating should be removed before application. LIMITATIONS Browse and shop for the sealant to suit your needs here today. Our range of polysulphide sealants is highly flexible and resistant to chemical reactions. They are insoluble in water, making them ideal for use externally in building and construction projects and offer improved UV resistance. In addition, we have a selection of polyurethane sealants that provide excellent tear resistance and can be used in a wide range of joint sizes. They can be used in a variety of applications, from car bodywork to roofline projects and light traffic floor joints. With the strength and durability to meet commercial and domestic requirements, we're confident you'll find a sealant here that fits your needs.Designed for use on joints that are consistently exposed to immersion in water, our range of polysulfide and polyurethane sealants are available to shop online here. From professional applications through to small-scale repairs, these products provide a water-resistant seal in environments where moisture is consistently high. They are easy to apply and formulated with strength, reassuring you for many years to come. With a variety of options to choose from, you can be assured you'll find the right solution to fit your needs here. Do not use on Polypropylene, Polyethylene or Teflon. As quality of uPVC; ABS and most plastics varies dramatically, always carry out adhesion tests prior to full scale use. Do not use in swimming pools or joints in constant water immersion. There were posts about the "similarity" with CT1 and that it was actually an improved formulation. Also a threat of legal action plus mention in advertising that the OB1 formulation had been in use for over 15 years and made by a private company. I could not find details of the manufacturer and it almost seemed to be a big secret. It appeared reasonable to assume that some sort of legally binding agreement had been signed regarding direct competition or comparison with CT1 by name (could be wrong).

Everbuild Tecnic Puraflex 25 600ml Foil Sausages premium quality Non Staining low modulus Polyurethane Sealant and adhesive.Do not use Everbuild Tecnic Puraflex 25 on surfaces that bleed oils or plasticisers. Do not use in conjunction with bitumen or asphalt – use Weathermate

Puraflex 25 is grey in colour, is free of both solvent and odour, and conforms to stringent SNJF and ISO specifications - ISO 11600 Class 25LM. Additionally, its movement capability is impressive, at +100/-50% (ASTM C719). Features & Benefits: Puraflex 25 Low Modulus PU Adhesive and Sealant - Grey