The Rockhard Range of Coatings
Jet stream steel under carriage leg coated with Rockhard
THE ROCKHARD RANGE OF COATINGS
576-450-002 ROCKHARD CLEAR STOVING ENAMEL & MICROPOROUS CASTING SEALER
615-155-001 ROCKHARD STOVING MATT BLACK EPOXY COATING
690-115-010 SPRAYING, MULTI-COAT ATTRITION COATING
700-155-003 ROCKHARD STOVING ZINC CHROMATE PRIMER
700-155-005 ROCKHARD TWO PACK EPOXY MATT BLACK
750-450-004 ROCKHARD TWO PACK CLEAR EPOXY GLOSS
750-152-009 ROCKHARD TWO PACK EPOXY GLOSS BLACK
985-000-693 to 696 ROCKHARD GREY, GREEN, WHITE & BLACK STOVING ENAMEL
PROTECTION OF MAGNESIUM USING INDESTRUCTIBLE PAINTS ORGANIC COATINGS RANGE
Rockhard is the name of a range of coatings that is still being developed after 40 years.New uses and markets are still being found for these incredibly versatile chemical and erosion resistant products.
(to DTD 5562. 444/176 and IP9040 CPMC 79964)
Epoxy Phenolic 961
This product was designed for the original painting of aircraft 40 years ago, such as the Comet and Westland Wessex. It is so good that it and its variants are still specified today on aircraft such as the Tornado, VC10, Airbus and BAC-111. As a protective coating it is particularly effective on magnesium and aluminium alloys and as such is recommended by Magnesium Electron. It is also used on steel, titanium and other metals. It is highly resistant to weathering and a very wide range of chemicals up to 200ºC (see chart). The original MOD spec required the coating to resist 3 months exposure to distilled water at 60-70ºF, 3 months exposure to humidity (Def 1053 No.25) and 6 months exposure to salt spray (Def 1053 No.36). Rockhard is also very effective at curing microporosity in magnesium and is recommended for surface sealing particularly as protection against chloride ions. It can be centrifuged, sprayed, roller coated or dipped, on magnesium, aluminium, steel or titanium. Approved for use by British Leyland for use on Radiators etc and recently by Toyota. It is also used to coat computer chassis for insulation purposes.
(to DTD 5562), Allied Signal FP5109, BMW Rolls Royce.
Similar to the 576-450-002, this product is sometime preferred. It is slightly more acid resistant when magnesium is rechromated after machining. Rockhard 985 is high flash, low toxicity and low odour. It also has slightly better colour retention properties, slightly thicker film thickness, but is less tolerant to adverse conditions and application and does not have quite such good intercoat adhesion. 985-111-800 is a good dipping product having been formulated with high flash, low odour solvents, it is also easily sprayed. Both 985-111-800 and 576-450-002 are fully compatible and will not cause problems if mixed. Used by both Allied Signal and Textron, it has most recently been approved by BMW Rolls Royce for use on the BRR 710 gearbox.
(to DTD 5562. 444-1081 and IP9044)
A gloss black epoxy Stoving enamel proven for many years as a protective coating, particularly magnesium and aluminium alloys. With similar properties to the Rockhard clear, it is also resistant to weathering and a very wide range of chemicals at up to 200ºC. Its uses include heat exchangers and aircraft components, including the Rolls Royce Trent control apparatus, boxes and covers.
(to DTD 56D & Rolls Royce MSRR 9226. 444-80 and IP9045)
Aircraft under carriages, control gear, brake temperature cases and optical equipment have all been coated in this matt black. With similar properties to the Rockhard clear and gloss black it has also been used for many years.
(to DTD 5562, Rolls Royce RPS 534, AQD & RTO Approvals RP123)
Used for more than three decades on compressor blades by the UKI's turbine manufacturers both in jet engine units and electricity generators. Like the other Rockhard stoving products it is highly resistant to acids, alkali's, organic solvents and temperatures up to 200ºC.
(to Lycoming MS M4735)
A glossy grey epoxy stoving coating to Fed. Stan 595-16099 developed for engine and other use including process specs. P6426 and P6445. This product has similar properties to the Rockhard Clear 576-450-002. A 2 part air drying colour matched touch up is available - IP9158 A & B, which is approved for P6426-P6 and P6445-P4.
(to DTD 56D & British Aerospace S26.3506)
A glossy, grey, epoxy stoving coating to the colour grey. Proven over many years as a protectant, it is highly resistant to weathering and a wide range of chemicals. It is currently used, for example, on the BAe 146 wing sections, Sidewinder air to air missiles and the Airbus.
(to MOD AFS538, Rolls Royce MSRR 9226 & BAe S26.3506, 444-3097)
(588/006/2, DTD 300/4825, AFS 881)
Although environmentally unpopular, chromate based primers are wonderful anti-corrosion products. Formulated originally for the aerospace industry, it is suitable for use on magnesium alloys, steel and aluminium. These particular products have been used in aerospace and other industries for more than thirty years as part of a system for superior metal protection. Currently specified on the Airbus, its users include Westland and others.
An established, decorative maintenance product, used for over three decades. With the acknowledged properties of the Rockhard stoving products, it is used on magnesium alloys, steel and titanium.
Rockhard two pack coatings are for use where stoving is not possible and good corrosion, weathering, or chemical resistance is required. Rockhard two pack products can be used not only on metals, but a variety of their substrates including wood, asbestos and many synthetic rubbers and plastics.
(750-452-002, 444-709 & IP9041, AFS 641c)
Rockhard clear, two pack coating, is for use where stoving is not desirable or possible. Used on a variety of substrates including metals, wood, asbestos and many synthetics rubbers and plastics. Also as a touch up materials for Rockhard Clear Stoving.
Rockhard gloss black two pack coating is used as a decorative protectant. Normally dust free in 15-30 minutes, it achieves its full cure in approximately 7 days.
Two pack matt black coating is used on a wide variety of substrates. Resistant to corrosion, weathering and chemical attack, it can also be used to touch up Rockhard Matt black stoving 615-155-001, used by MOD in such diverse applications as Harrier fuel pump diaphragms, general engine touch-up, flexible fuel tanks, composites, and coating glass, prisms, etc.
The second part of the Rockhard Two Pack Coating used in a 1:1 mixing Rockhard Two Pack Clear (750-450-004) and Rockhard Two Pack Gloss Black (750-152-009) and 1:4 mixing ratio with Rockhard Matt Black Two Pack (700-155-005). (5 litres catalyst: 20 litres 700-155-005).
The normal thinners for both Rockhard stoving and two pack products.
For use with both Rockhard stoving and two pack products. Often used with two pack products to reduce drying time.
Occasionally, due to circumstances such as bad de-greasing, or problem applications, Rockhard can 'pinhole'. A small addition of anti-cyssing can overcome these problems.
Rockhard is the name of a range of coatings that is still being developed after 40 years. New uses and markets are still being found for these incredibly versatile chemical and erosion resistant products.
Please contact one of our technical team for a range of solutions.
