Volkswagen Polo Service & Repair Manual: Polyurethane Adhesive Sealant

Volkswagen Polo Service & Repair Manual / General Paint Information / Original Products / Sealing Materials / Polyurethane Adhesive Sealant

Definition:

Polyurethane Adhesive Sealant -AKD 476 KD5 05-

Edition 04/2009

Product Description

Polyurethane Adhesive Sealant -AKD 476 KD5 05- is a paste-like, one-part adhesive sealing material with a polyurethane basis which forms a rubbery/elastic material when it hardens.

The film formation and hardening time depends on the humidity and temperature. The hardening time is also affected by the joint depth.

These times can be shortened by raising the temperature and humidity. Lower temperature and humidity levels delay the hardening.

Properties:

Can be painted over, even “wet-in-wet”

Very fast drying

Levels out slightly on the surface

Excellent elasticity

High resistance to aging

Can be sanded

Can be spread

Application Instructions

Application

Polyurethane Adhesive Sealant -AKD 476 KD5 05- is used for elastic sealing/adhesion, especially for sealing welds and sealing very narrow joints where its lack of stability is of no consequence in the following areas: body and vehicle assembly as well as vehicle add-ons, especially if the sealant is to be painted. To avoid yellowing or cracking, the material should always be painted over when used on the outside seams.

The use of Polyurethane Adhesive Sealant -AKD 476 KD5 05- means that mechanical securing methods such as bolting, welding and clamping can be partially omitted. Until the sealing/adhesive has hardened, the parts should be temporarily fixed in position with adhesive tapes and spacers.

The Polyurethane Adhesive Sealant -AKD 476 KD5 05- has the major advantage of being both an adhesive and a sealant.

The material is suitable only to a limited extent for some adhesive purposes in vehicle construction.

Adhesive Characteristics

The Polyurethane Adhesive Sealant -AKD 476 KD5 05- provides good adhesion without glass-/paint primer on primed and painted bodywork, on wood (untreated, glazed and painted), some plastics such as PBTP, polyurethane hard foam and GF polyester.

Depending on the base surface it may be necessary to use a glass-/paint primer as an adhesion agent to achieve an optimum adhesion.

On account of the large number of primers, paints and differing plastic surfaces etc., it is recommended to conduct an application-specific test beforehand.

Careful cleaning on plastic and metal surfaces with a suitable solvent often results in significantly better adhesion.

Note

Before starting to apply, it is necessary to read the safety measures and advice in the safety data sheet.

Even for products which are not required to be labeled by law, the usual safety measures must be observed for chemical emissions.

Processing

Note

Body areas and adhesion surfaces that are to be sealed must be insulated with a Two-Part Filler before applying the material.

The adhesion surfaces must be dry, free of oil, dust, grease and any other impurities. Cleaners A, D and Plastic Cleaner -D 195 850 A1- are suitable for cleaning.

The application of Polyurethane Adhesive Sealant -AKD 476 KD5 05- from a 310 ml nozzle cartridge is done with a manual or compressed air guns. The 310 mL foil cartridges are used with the Cartridge Gun -VAG1628- or the Pneumatic Cartridge Gun -VAG1761/1-. A pressure of 2 to 5 bar is required for compressed air application.

Low material temperatures of the sealant increase its viscosity. This results in a lower spraying rate. To prevent this the sealant should be brought to the correct temperature in the appropriate manner before processing begins.

If the base surface is too cold, condensation can form if the temperature is lower than the dew point. This should be avoided by heating the base surface beforehand.

After processing, the Polyurethane Adhesive Sealant -AKD 476 KD5 05- can be smoothed with a jointer or a spatula which have been moistened with low surface tension water. If the edges of the joint are masked with tape, simply pull off the tape with a spatula.

It is recommended to use cleaner D to remove any unhardened adhesive sealing material from the tools.

Painting procedure

The Polyurethane Adhesive Sealant -AKD 476 KD5 05- can be painted over using the “wet-in-wet” process with one-part and two-part repair paint with an alkyd resin-acrylic base as well as with all original repair paints.

Nitro repair paints out of a spray can and paints, paint thinners and catalysts with alcohol content are not compatible with the adhesive sealing material (no hardening).

Corrosion protection primers may only be applied to hardened material as they are strongly hindered in most cases by steam diffusion.

If drying is accelerated by the use of a drying oven or an IR dryer radiator, a pre-reaction/waiting time of at least 30 minutes must be adhered to. Only then is the painted over adhesive sealing material to be warmed. The maximum permissible temperature for non-hardened material is +90 °C (194 °F) for one hour.

Incompatibility

Polyurethane Adhesive Sealant -AKD 476 KD5 05- does not adhere to sealants that have a MS polymer and silane-modified polymer base.

On the other hand, if the hardened Polyurethane Adhesive Sealant -AKD 476 KD5 05- is processed on MS-polymerer and silane-modified polymer base, then there is good adhesion.

Technical Data

Color	White, grey, black
Odor	Classified by aroma (odorless in hardened condition)
Consistency	Paste-like, can be applied with brush or spatula
Stability	Levels out slightly on the surface
Film formation type (standard climate conditions DIN 50014)	15 to 45 minutes, at +23 °C (73.4 °F) and a relative humidity of 50 %
Hardening speed (standard climate conditions DIN 50014)	Approximately 5.5 mm/ 24 hours, at +23 °C (73.4 °F) and a relative humidity of 50 %
Volume change	approximately -6 %
Processing temperature	+5 °C to +35 °C (41° to 95 °F)
Application temperature	-40 °C to +70 °C (-40° to 158 °F) (limited: 24 hours at +80 °C (176°), short-term: 1 hour at +120 °C (248 °F))

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