Volkswagen Polo Service & Repair Manual: Polyurethane Adhesive Sealant
| Polyurethane Adhesive Sealant -AKD 476 KD5 05- |
| 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. |
| Can be painted over, even “wet-in-wet” |
| Levels out slightly on the surface |
| 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. |
| 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. |
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. |
| 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. |
| 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. |
|
|
|
| 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)) |
Definition:
Sprayable Sealant -D 476 KD1 M2-, gray
Sprayable Sealant -D 476 KD2 M2-, black
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