GU 1K installation adhesive

Substrates

• The GU-1K installation adhesive cures excellently on a variety of substrates and mostly without primer. These include metals (AlCuMg1, AlMgSi1, brass, zinc, steel ST, 1403 electrogalvanised and hot-dip-galvanised steel and other steels), expanded polystyrene, cork, enamel, concrete, glass, HPL, timber and PMMA as well as GFRP – (but not PE, PP, PTFE and silicone).
• In general, care should be taken with plastics to ensure that release agents used in manufacture or protective films used for transport are removed before gluing, leaving no residue. Otherwise, adhesion to the component deteriorates considerably. Plastics containing plasticisers (e.g. soft PVC, butyl rubber, EPDM and APTK) may exhibit incompatibilities such as discolouration and loss of adhesion. Suitability for use with the system should be tested in such cases.
• Caution: PMMA and polycarbonate must not be glued under tension, or otherwise stress cracks will form. Preliminary testing is strictly recommended for polycarbonate.
• Adhesion surfaces must always be suitable for coating, clean, and free of dust and grease. Dry and clean substrates are particularly suitable and produce the best bond values. GU 1K installation adhesive also sticks to moist substrates, and even underwater. Adhesion achieved in this way may, however, be weaker than adhesion to dry and clean substrates.
• Pretreatment: porous substrates that are subject to relatively high water loads should be pretreated with GU primer if appropriate. For all smooth surfaces we also recommend to improve the adhesion by using a GU primer.

Processing

• Application method
  • GU manual or compressed-air gun
• Processing temperature
  • Ambient temperature: +0 °C (frost-free) to +40 °C
  • Temperature of adhesive surface: +0 °C (frost-free) to +35 °C
• Caution: Curing of the GU-1K installation adhesive occurs from outside to inside as a result of air humidity at room temperature and slows over time. At low temperatures and/or low air humidity curing can be significantly slower!

Joint dimensions

• Minimum width
  • for gluing: 2 mm
  • for sealing: 5 mm
• Maximum width
  • for gluing: 10 mm
  • for sealing: 30 mm
• Minimum depth
  • for gluing: 2 mm
  • for sealing: 5 mm
• Recommended
  • Joint width = 2 x joint depth (> 6 mm width)
  • Joint width = 1 x joint depth (< 6 mm width)

Storage

• Store in the unopened packaging in a cool (+5 °C to +25°C), dry place. Seal opened containers well and use quickly.

Safety instructions

• Observe standard workplace hygiene

Chemical resistance

• Good: water, aliphetic solvents, dilute anorganic acids and alkalis, oils and greases
• Bad: aromatic solvents, concentrated acids and chlorinated hydrocarbons

Note

• The GU-1K installation adhesive is paintable. Due to the variety of coating systems available on the market, we recommend carrying out compatibility and adhesion tests in advance. For example, in accordance with the relevant standards such as DIN 18540, elastic sealing compounds should not be coated completely, because otherwise cracks can form in the non-elastic paint when tensions and movements occur. The drying time of alkyd resin paints may also be delayed. Any soap residue from the smoothing water should be removed prior to coating, as this can impair the adhesion of the coating. An adhesion and compatibility test for the adhesive itself is advisable for the different substrates.

^[1]Measured according to standard atmosphere (EN ISO 291) at 23 °C / 50 % rel. hum. These values can vary due to environmental factors such as temperature, humidity and the nature of the substrate.
^[2]Substrate AlMgSi1, layer thickness 2 mm, feed rate 10 mm/minute.