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32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING ROOFING WATERSTOPS WATERPROOFING JOINT FILLERS TIMBER FLOORING ALPHABETICAL INDEX 312 Technical Data Emer-Seal® PU25 Sheet High performance, flexible, onecomponent, polyurethane joint sealant Uses Sealing joints in concrete panels, fibrous cement products, external cladding panels, blockwork and brickwork. Also in sealing joints around aluminium and timber door and window frames and between metal. Also suitable for sealing sawn joints up to 10 mm wide in concrete floors and pavements. Advantages „ Excellent primerless adhesion to concrete, timber, masonry, bricks, aluminium, metal and ceramics „ Neutral cure „ Low odour „ Fast skinning and fast curing Description Emer-Seal PU25 is a high performance elastomeric joint sealant based on polyurethane technology. Emer-Seal PU25 uses a neutral cure system reacting on exposure to atmospheric moisture. When cured it forms a waterproof and durable seal, which makes it ideal for exterior applications. Technical Support Parchem also offer a technical support package to specifiers and contractors which includes on-site, technical advice from staff experienced in the construction industry. Design Criteria Emer-Seal PU25 may be applied in joints between 5 mm and 50 mm wide. All moving joints should be designed to an optimum width to depth ratio of 2:1, with a minimum joint size of 5 mm wide by 8 mm deep for porous surfaces or 5 mm wide by 5 mm deep for non-porous surfaces. Sealing joints in concrete and other masonry surfaces Backing Rod Emer-Seal PU25 Properties Data quoted are typical for this product but do not constitute a specification. Form: Smooth, non-slump paste Movement ± 25% (total 50%) accommodation factor: Skinning time: 15 mins at 23°C, 50% RH Cure speed: 3 mm / day 23°C 50% RH Typical hardness Shore 20 ‘A’ (ISO 868): 100% Modulus (ISO 8339): 0.20 MPa Elongation at break: >600% Chemical resistance to occasional spillage: Good resistance to dilute acids and alkalis Continuous service temperature range: - 30°C to + 80°C Maintenance There are no special requirements, however, any damage found during routine inspections should be cut out and replaced. Specification Clauses Where so indicated on the drawings, joints are to be sealed using Emer-Seal PU25, a one part polyurethane joint sealant as supplied by Parchem. The sealant must be capable of ±25% joint movement, have an elongation at break (NFT 85 507) of greater than 600%, Shore A hardness in the range of 15-25 and an elastic modulus at 100% elongation (ISO 8339) of 0.15 - 0.25 MPa. Joints must be prepared and primed where required in accordance with the current technical data sheet. The product manufacturer must be accredited to ISO 9001. The sealant and associated materials must be installed by a contractor nominated by the supplier. Application Instructions Preparation The joint surfaces must be thoroughly dry, clean and frost free. Remove all dirt, laitance, loose materials and foreign matter. Remove all rust, scale and protective lacquers from metal surfaces. Non-porous surfaces should be degreased using Parchem Solvent 10. In all joints a bond breaker must be used to prevent sealant contact with the back of the joint, to allow optimum sealant performance. In shallow joints self-adhesive polyethylene tape can be used. Deep joints should incorporate a backing strip such as Expandafoam or Stiffjoint to support the sealant while also January 2013


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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