RomoCoat HB Coal Tar Epoxy 7260
RomoCoat HB Coal Tar Epoxy 7260 is a two‑component, polyamide‑cured, high‑build coal tar epoxy for long‑term protection of steel and concrete in immersed and very wet, chemically aggressive environments.
Product description
- Two‑pack coal tar–epoxy coating combining epoxy resin with coal tar to give excellent adhesion, abrasion resistance, water impermeability and resistance to dilute acids, alkalis and many industrial chemicals.
- Designed as a high‑build barrier coat for submerged, underground and splash‑zone exposure on steel (and suitably prepared concrete) where long‑term service is required.
Typical applications
1) Hydropower & water infrastructure
- Hydro‑electric units: penstocks, draft tubes, spiral casings, water passages and gates carrying raw water to turbines.
- Dam and canal structures: steel liners, sluice gates, guide vanes and steel parts permanently or intermittently immersed in fresh water.
2) Marine & harbour installations
- Harbour and jetty steel: piles, dolphins, fenders, sheet piles, quay structures and submerged/ splash‑zone steel exposed to sea water, tidal action and abrasion.
- Underwater hull exterior (in conjunction with cathodic protection): outer hull below waterline, bilge areas and other immersed steel, where coal tar epoxy provides an excellent acid/alkali and water barrier under CP systems.
3) Cooling towers & water treatment
- Cooling‑tower basins, channels, inside/outside of riser pipes and structural members exposed to continuous wetting and mildly aggressive circulating water.
- Water and effluent treatment facilities: clarifier bridges, tanks, contact chambers, sewage and effluent lines where resistance to sewage, salt, dilute acids/alkalis and microorganisms is required.
4) Underground & buried structures
- Underground pipelines, external surfaces of buried steel, foundations, piles and other below‑ground steel/concrete exposed to moist, acidic or alkaline soils.
- Crude‑oil and fuel storage tanks (external below‑grade portions or internal where coal tar is allowed by spec) and bund walls subject to chemical and water attack.
Product Data Sheet
| Property | Details |
|---|---|
| Colour | Black |
| Finish | Egg‑shell to semi‑glossy. |
| Mixing ratio | 3 : 1 by volume (Base : Hardener). |
| Pot life | 1–2 hours at 30 °C |
| Volume solids | approx. 58 ± 2%. |
| Recommended DFT/coat | 75–100 µm |
| Theoretical spreading rate | 7.73–5.80 m²/L at 75–100 µm DFT |
| Theoretical spreading rate | Surface dry: ~1–2 hours. Touch dry: ~6 hours. Hard/handle dry: ~16 hours. |
| Fully cured | Hard/handle dry: ~16 hours. |
| Minimum | 16 hours at 30 °C. |
| Maximum | 4 weeks |
| Flash point | Above 25 °C. |
| Thinner | Epoxy thinner. |
Surface Preparation
Substrate:
- Steel surfaces must be properly cleaned and pre‑primed with a suitable epoxy primer/intercoat as specified (e.g. epoxy zinc phosphate or epoxy mastic primer) before applying RomoCoat HB Coal Tar Epoxy 7260.
- Surface should be dry and free from oil, grease, dust, salts and other contamination.
Preparation level:
- For new steel in immersion/soil contact: abrasive blast cleaning to Sa 2½ with suitable profile is strongly recommended.
- For maintenance: remove rust, scale and loose/unsound coatings by blast or power‑tool cleaning; feather edges of sound coatings and ensure firm adhesion before overcoating.
Old primed/inter‑coated surfaces:
- Clean thoroughly; any gloss or chalk must be removed and surface roughened (sweep blast or coarse sanding) prior to coal tar epoxy application.
Typical systems:
- Immersion / hydro & cooling water:
- Epoxy primer → 2 × RomoCoat HB Coal Tar Epoxy 7260 (total 150–200 µm) as per project spec.
- Underground pipelines / buried steel:
- Epoxy primer → 2–3 × HB Coal Tar Epoxy (total 200–300 µm) depending on soil aggressiveness and standard (IS/ISO/owner spec).
- Harbour/marine steel:
- Epoxy or zinc‑rich primer → 1–2 × Coal Tar Epoxy → (optional) antifouling or tie‑coat where required by marine system design.
Application guidance
- Mix base and hardener at 3:1 by volume with mechanical stirring until uniform; due to short pot life, prepare small batches that can be applied within 1–2 hours at 30 °C.
- Adjust viscosity with epoxy thinner only if necessary for spray; excessive thinning reduces film build and barrier performance.
- Apply by air spray or brush; for large areas and immersion service, airless spray is usually preferred to achieve specified DFT in fewer coats (you can align your internal nozzle/pressure recommendations with typical coal tar epoxy practice).
- Avoid applying in strong direct sunlight on hot steel or in very high humidity/condensation conditions, which can cause defects or amine blush.
Health & Safety
- Avoid inhalation of solvent vapour and paint mist and avoid skin and eye contact; use appropriate PPE (organic vapour respirator, gloves, goggles, protective clothing) as per local regulations.
- Provide forced ventilation when working in confined or poorly ventilated spaces (tanks, penstocks, pits, below‑ground structures).
Storage
Store in a cool, dry, well‑ventilated place; keep containers tightly closed and away from direct sunlight and heat/ignition sources.