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Sikagard®-6682

Water-based sound-deadening underbody coating

Sikagard®-6682 is a water-based sprayable sound-deadening and anti-chip coating, based on an acrylic dispersion. It is used in commercial vehicle manufacturing to dampen structure-borne noise. The Product provides as well stone chip protection to vulnerable parts, enhancing therefore the primary corrosion-protection performance of pre-applied coatings.

High resistance to abrasion
Very good sound-deadening performance
Low water take-up
Thick-layer spray application without dripping or sagging
Solvent- and halogen-free

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PRODUCT BENEFITS

High resistance to abrasion
Very good sound-deadening performance
Low water take-up
Thick-layer spray application without dripping or sagging
Solvent- and halogen-free

Areas of Application

Sikagard®-6682 is used for the reduction of structure-borne noise in commercial vehicles. It also provides stone-chip protection for vulnerable parts of the vehicle such as sills, wings, wheel arches and other parts. It exhibits good adhesion on many coatings and primers used in the transportation industry. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.

Product Details

Typical Product Data

Chemical base		Water-based acrylic dispersion
Color (CQP001-1)		Dark grey
Cure mechanism		Water evaporation
Solid content (CQP002-1)		75 %
Viscosity	Rheolab QC CC 27 rotational at 1 s^-1	175 Pa·s ^A
Application temperature		5 – 35 °C
Film thickness	for stone-chip protection for sound deadening	500 ─ 1000 μm see diagram 1
Drying time	1 mm wet layer 2 mm wet layer	8 hours ^A 24 hours ^A
Loss factor (ISO 6721-3)		see diagram 1
Stone-chip resistance (ISO 20567-1, Method B)	1 mm dry film	80 cycles
Service temperature		-45 – 120 °C
Shelf life		9 months

CQP = Corporate Quality Procedure

^A) 23 °C / 50 % r. h.

Technical Information

CURE MECHANISM

Sikagard®-6682 hardens by evaporation of water and physical film formation.

CHEMICAL RESISTANCE

Sikagard®-6682 is generally resistant to fresh water, seawater, oils, diluted acids and bases.

The above information is offered for general guidance only. Advice on specific applications will be given on request.

Application

Application Information

Surface preparation

Sikagard®-6682 is not to be used as corrosion protection, therefore it is mandatory that metal substrates carry an adequate corrosion protection, such as coating, galvanization, etc.

Surfaces must be clean, dry and free of rust, dust and grease.

Application

Sikagard®-6682 can be applied to small areas with a spatula. For larger areas airless spraying equipment is recommended. Usually double-action stainless steel pump systems are used.

For airless spraying application, different nozzle types are available on the market. The choice of the nozzle depends from the desired coverage and finishing and must be determined by application tests.

A coverage of 500 μm to 1000 μm dry thickness is in general sufficient for underbody stone-chip protection applications. In case of critical areas higher thicknesses may be applied.

For sound-deadening applications the thickness of the coating depends from the desired damping result. The dependence of the composite loss factor from the thickness of Sikagard®-6682 is visible in the following graph (on 1 mm steel bar).

en_PNG_01-diagram-sikagard-6682

Diagram 1: Composite loss factor (ISO 6721-3)

Applied coating must be sufficiently dried before exposure to freezing or wet conditions. The exact waiting time must be determined by project related tests. The dry time can be decreased significantly with a proper ventilation.

For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.

Removal

Fresh Sikagard®-6682 can be removed from tools and equipment with water. Once dried, the material can only be removed mechanically.

Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water.

Do not use solvents on skin.