VW Golf manuals

Volkswagen Golf Service & Repair Manual: Polyurethane adhesive sealant (bonding compound)

Designation:
Polyurethane adhesive sealant (bonding compound) -AKD 476 KD5 05-
Issued 04.2009
Product description
Polyurethane adhesive sealant -AKD 476 KD5 05- is a one-pack adhesive sealing paste on polyurethane basis which, when exposed to air humidity, hardens into a rubbery-elastic material.
The time required to form a skin or to cure completely depends on the air humidity and the temperature. The curing time also depends on the depth of joints.
Increasing the temperature and air humidity can reduce these times. Low temperatures and low air humidity, on the other hand, increase them.
Properties:
Can be overpainted, even “wet-on-wet”
Very fast-drying
Levels out slightly on the surface
Excellent elasticity
High resistance to ageing
Can be sanded
Can be spread
Technical data sheet
Application
Polyurethane adhesive sealant -AKD 476 KD5 05- is used for elastic seals and bonds, especially for sealing seams and very narrow gaps where the lack of durability is not a problem, in the field of body and vehicle construction as well as add-on structures, especially when the seam sealant is to be painted over. To avoid yellowing or cracking, the sealant should always be painted over when applied to vehicle exterior.
When polyurethane adhesive sealant -AKD 476 KD5 05- is used, mechanical attachment by means such as bolting, welding and clamping can, in some cases, be omitted. Until the adhesive sealant has cured, parts should be temporarily fixed in position with adhesive tape strips and spacers.
Polyurethane adhesive sealant -AKD 476 KD5 05- has the major advantage of being both an adhesive and a sealant.
The material is not suitable, or only conditionally suitable, for the bonding of load-bearing joints.
Bonding properties
Polyurethane adhesive sealant -AKD 476 KD5 05- offers good adhesion without glass or paint primer on primed or painted metal bodywork, on wood (untreated, varnished or painted), some plastics such as PBTP, polyurethane hard foam or fibreglass-reinforced polyester.
Depending on the substrate, it may be necessary to apply glass or paint primer to achieve the best possible adhesion.
Due to the large number of primers, paints and differing plastic surfaces etc., we recommend conducting an application-specific test beforehand.
Careful cleaning of plastic and metal surfaces with a suitable solvent often results in significantly better adhesion.
  Note
Before using, read the safety measures and recommendations in the safety data sheet.
Even for products which are not required by law to be labelled, the usual safety measures for chemical products must be observed.
Application
  Note
Areas of the body to be sealed and adhesion surfaces must be isolated using 2-pack surfacer before the material is applied.
The adhesion surfaces must be dry, free of oil, dust, grease and any other impurities. Cleanser A, cleanser D and plastic cleaner -D 195 850 A1- are all suitable for cleaning purposes.
Polyurethane adhesive sealant -AKD 476 KD5 05- is applied from 310 mm cartridges using a hand cartridge gun or a pneumatic cartridge gun. The 310 ml soft plastic cartridges can be used with hand-cartridge gun -V.A.G 1628- or with pneumatic cartridge gun -V.A.G 1761/1-. A pressure of 2 to 5 bar is required for application with compressed air.
Low sealant temperatures increase its viscosity, which results in a lower spraying rate. To prevent this, the sealant should be brought to the correct temperature in an appropriate manner before beginning application.
If the substrate is too cold, condensation can form if the temperature is lower than the dew point. This is to be avoided by warming the substrate beforehand.
After application, polyurethane adhesive sealant -AKD 476 KD5 05- can be smoothed with a jointing iron or a filling knife which has been moistened with low surface-tension water. If the edges of the joint have been masked, simply pull off the tape with a filling knife.
Cleanser D is recommended for removing fresh adhesive sealant from equipment.
Overpainting properties
Polyurethane adhesive sealant -AKD 476 KD5 05- can be overpainted “wet-on-wet” with one-pack and two-pack alkyd resin-acrylic-base repair paints as well as with all Genuine repair paints.
Nitrocellulose repair paint in an aerosol can and paint, paint thinner and catalysts containing alcohol are not compatible with the adhesive sealant (no hardening).
Corrosion protection primers may be applied only to fully cured material because they generally severely impede water vapour diffusion.
If drying is accelerated by the use of a drying oven or an IR radiant drier , a pre-reaction and waiting time of at least 30 minutes must be adhered to. Only then may the overpainted adhesive sealant be warmed. The maximum permitted heat exposure for uncured material is 1 hour at +90 °C.
Incompatibility
Polyurethane adhesive bonding compound -AKD 476 KD5 05- will not adhere to sealants on MX polymer or silane-modified polymer basis.
On the other hand, good adhesion will be achieved when applying materials based on MS polymers or silane-modified polymers to fully cured polyurethane adhesive bonding compound -AKD 476 KD5 05-
Technical data
   
Colour white, grey, black
Odour Aromatics (odourless when fully cured)
Consistency Paste, can be applied with brush or filling knife
Stability Levels out slightly on the surface
Skin formation time (standard climate conditions DIN 50014) 15-45 minutes at +23 °C and 50% relative humidity
Curing rate (standard climate conditions DIN 50014) approx. 5.5 mm/24 hours at +23 °C and 50% relative humidity
Volume change Approx. -6%
Working temperature +5 °C to +35 °C
Use temperature -40 °C to +70 °C (at +80 °C, restricted to 24 hours; at +120 °C briefly, up to 1 hour)
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