Rockhard / IP985 stoving and cold-cure epoxy systems for protection of magnesium and aluminum

Country: United Kingdom · Model: Rockhard, IP985

Stoving and cold-cure epoxy systems for protection of magnesium and aluminum parts. The set includes casting pore sealants, primers and finishes that also work on steel and titanium. The range dates back to the 1950s.

System composition: pore sealants (985-111-800, IP985-547), primers (chromate 700-155-003; chromate-free IP985-6500), finishes IP985 and 985-000-693…696, 614-150-002-R1, 615-155-001, 690-152-004 (DTD56D, ABP 4-2)
Cold-cure: 750-450-004 (clear 2K), 750-152-009, 700-155-005 (2K epoxy)
Substrates: magnesium, aluminum, steel, titanium
Application: helicopter gearbox housings, turbine blades, heat exchangers, radiators, drives, engine parts

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Technical specifications

Customs codes (for reference)
System composition	pore sealants (985-111-800, IP985-547), primers (chromate 700-155-003; chromate-free IP985-6500), finishes IP985 and 985-000-693…696, 614-150-002-R1, 615-155-001, 690-152-004 (DTD56D, ABP 4-2)
Cold-cure	750-450-004 (clear 2K), 750-152-009, 700-155-005 (2K epoxy)
Substrates	magnesium, aluminum, steel, titanium
Application	helicopter gearbox housings, turbine blades, heat exchangers, radiators, drives, engine parts
Recommendation	Magnesium Elektron (stoving enamels and varnish 985-547)
Magnesium, other	IPRC21 / LR3279 (EPS11430), DOW 19, chromating solution for touch-up of magnesium
Thinners	665-550-025, IP985-REDUCER
REACH	700-155-003 contains CAS 49663-84-5 (SVHC)
NSN (NATO Stock Number)	8010-99-225-3338; 8010-99-225-3339; 8010-99-608-3363; 8010-99-756-0842; 8010-99-794-0121 (per the manufacturer's document, to be confirmed by packaging)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/10/2026. Customs codes are for reference only; the final code is determined at customs declaration for the specific model.

Description

The basis is stoving epoxy systems on a resin of the 961 family, as well as two-component cold-cure materials for touch-up. The microporous casting sealant 985-111-800 and the varnish 985-547 are needed for maximum protection of magnesium in a marine environment. Primers are the chromate 700-155-003, which contains an SVHC under REACH, and the chromate-free IP985-6500. The finishes IP985, 985-000-693…696, 614-150-002-R1, 615-155-001 and 690-152-004 per DTD56D and ABP 4-2 coat engines, heat exchangers and helicopter gearboxes. For cold cure there is the clear 2K epoxy 750-450-004 and the black 750-152-009 and 700-155-005. For magnesium the resin IPRC21/LR3279 per EPS11430 and the DOW 19 solution for touch-up by chromating are made. Thinners are 665-550-025 and IP985-REDUCER. The series began in the 1950s with coatings for the SRN1 craft and the Westland Widgeon helicopter, and now has more than 50 years of experience. Typical products are helicopter gearbox housings of magnesium, turbine blades, air intakes, heat exchangers and radiators where aluminum replaced copper.

How to choose

If the part can be baked, take the stoving systems on the 961 resin, and when an oven is unavailable, the cold-cure systems 750-450-004, 750-152-009 or 700-155-005. The chromate-free primer IP985-6500 is chosen when chromate is undesirable, while the chromate 700-155-003 contains an SVHC under REACH. It can be applied over the varnish 985-547 as a standalone layer or in a system with IP985 finishes. For touch-up of magnesium by chromating there is the DOW 19 solution.