Datasheet

UHU plus sofortfest
UHU GmbH & Co. KG - P.O. Box 1552, D-77813 Bühl , Tel. [phone] – Fax. [phone] Internet: www.uhu.de
Technical Data Sheet
Merkblatt
Note:
Rapid hardening systems generally show a certain degree of loss after the increase in the bond strength and vary
around a lasting average value.
High temperatures are not necessary for the hardening process, as hardening is exothermic (i.e. it generates its own
heat).
If a bond is to be subject to long-term exposure to heat, this should not exceed 100°C, although the substance can
withstand short-term temperatures of up to 180°C.
It is extremely difficult to remove parts subsequently from glass surfaces as resin solvent can only reach the adhesive
near the edges.
UHU plus sofortfest should therefore not be used for sticking signs, letters and similar items to large glass surfaces
such as shop windows, since the bond is so strong that the dimensional changes in the metal could result in the glass
breaking under unfavourable conditions.
Resistances:
UHU plus sofortfest joins are substantially resistant to moisture and a range of solvents. Dilute acids, dilute alkalis
and mineral oil have little effect on bond strength, even in the event of lengthy exposure. No universally valid data can
be given as there are always many factors, such as the possibility of corrosion, duration of exposure and
temperature, that affect the assembly.
Some solvents, such as methylene chloride, trichloroethylene and chloroform (Warning! Precautions must be taken!),
soften the adhesive over a period of time. This effect can be made use of for dissolving adhesive joins.
UHU plus sofortfest is resistant to ageing and weathering. The adhesive is not affected by even extremely low
temperatures.
Application:
Preliminary treatment of surfaces to be stuck together.
The surfaces to be stuck together must be cleaned very thoroughly before the adhesive is applied. It is worth first
using abrasive cloth (abrasive rating 150-200) then degreasing using cellulose moistened with a grease solvent such
as acetone. Special preliminary treatments to achieve the best possible bond strengths are described in DIN
Regulation 53281 (Sheet 1). (This may be obtained from Beuth-Verlag GmbH in Berlin.)
Preliminary treatment of various materials:
Metals: It is worth roughening the surface with abrasive cloth; the part must always be thoroughly degreased using
solvent.
Glass, porcelain and similar materials should be degreased using solvent.
Wood only needs to be free of dust, grease and oil on the surface.
Hardened plastics (duroplasts) such as Bakelite® and melamine, resorcin, polyester and epoxy resins should be
roughened with an abrasive cloth (abrasive rating 100) and degreased as above.
UHU plus sofortfest is not suitable for use with thermoplastic plastics such as polyethylene, polypropylene,
polystyrene and soft PVC as they provide a poor basis for bonding.
Possibility of modifying the product:
It is possible to modify UHU plus sofortfest by adding fillers.
Adding ground wood or sawdust produces a wood-like mass for application using a spatula or for modelling, on which
woodworking tools can be used.
Adding ground aluminium produces a filler material with the appearance of metal. If the adhesive needs to be
coloured, colour pigments or colorants may be added to the mixture. Almost any grease- and oil-free colour powder is
suitable for this.
A hard material similar to stone can be produced by mixing ground quartz, fine sand, talc, chalk or kaolin to the
mixture.