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Molydag 709

IP Code Nos -

Description Molydag 709 is a single pack, solvent based lubricant system that operates under high load conditions on metal surfaces. The coatings may be air dried, however, they should be heat cured to develop the full properties which include lubrication, a wide temperature range, excellent wear life and resistance to corrosion.

This product is approved by the Ministry of Defence under specification number DTD 90/4647.

Benefits

Typical Applications

Typical application of dry film lubrication to achieve long lasting, high load lubrication on metal surfaces, such as:

Typical Properties (of wet product)

Pigment

molybdenum disulphide

Binder :

thermosetting resin

Solids content :

39.0 - 40.5%

Viscosity (BS cup 18-22°C) :

18 - 40 sec.

Flashpoint:

4°C

Density :

ca. 1300 kg/m³

Theoretical coverage :

20 m²/kg at 10 mm um

Diluents

xylene, toluene, white spirit

Shelf life :

18 months from date of qualification in original container

Typical Properties: - (as cured)

Colour:

dark greenish grey

Coefficient of friction

0.07 approx. lower figures were obtained under very high loads. Low friction values are maintained in a vacuum.

Min. service temperature:

-50°C

Max. service temperature (as a lubricant):

200°C

Max service temperature: (to prevent seizure of threaded joints and similar assemblies):

400°C

Method of Use: -

The performance obtained with a Molydag® coating depends on the substrate preparation, product dilution and application. Lack of attention to any one of these processes can seriously impair the final coating quality.

Surface preparation

All surfaces should be dry and free of contaminants such as dirt, grease and powder. Smooth surfaces should be roughened with grade 'O' emery cloth. Although a solvent wipe is suitable for many applications, for maximum performance the following pretreatments are recommended:

Steel :

degrease, sandblast and phosphate

Stainless steel :

degrease, sandblast and oxalate

Aluminium :

degrease, sandblast and anodise

Copper alloys :

degrease, sandblast and acid etch or chromate

Zinc alloys :

degrease, sandblast and chromate

Mixing and dilution

Molydag 709 should be well stirred before use, to redisperse the sediment that forms on standing.

Molydag 709 is a concentrate and should normally be diluted for use with a compatible solvent. Suitable dilution ratios for the different methods of application are suggested below.

However, the correct dilution ratio and solvent for each individual application must be determined by small scale testing, and specific recommendations will be provided on request. (After dilution, the ready for use material requires occasional agitation to keep the dispersed molybdenum disulphide in complete suspension).

Brushing

Dilute with up to one volume of diluent, tolene, xylene or trichloroethylene are recommended for brush application at room temperature. A small soft-haired brush should be used to give a thin smooth coating.

Dipping

Dilute with one volume of diluent. For fast drying of components at room temperature use tolene, trichloroethylene (TCE) or Genklene. It is often convenient to coat components by dipping them while still hot from a TCE vapour degreaser. For this purpose white spirit is the most suitable diluent.

Spraying

The addition of between one and three volumes of diluent is recommended. Toluene, xylene or trichloroethylene are suitable for spray coating surfaces up to 50°C. Use an external atomising spraygun with air pressure between 2 - 3 bars. Build up the coating in several spray passes. Three or four coats are needed to give optimum lubrication and wear resistance.

Coating thickness

Each spray pass should provide a dry coating thickness of approx. 4 - 5 mm. The total thickness of the coating should lie between 12 and 20 mm. For maximum wear life and adhesion, coatings should not exceed 15 mm.

Air drying

Coatings must be allowed to air dry and harden before use. At room temperature, hardening will require at least an hour after the coatings have become touch dry. This hardening process can be accelerated by warming e.g. by infra-red lamps or hot air blowing.

Heat curing

For maximum adhesion, wear life and chemical resistance, the coatings must be cured: 60 minutes at 200°C gives a good cure.

Cleaning

Clean spray guns and equipment immediately after use with xylene.

Handling Precautions & Health & Safety: -

Before use please request, our latest Health and Safety Data Sheet