Intershield 300

Intershield 300 is an aluminium-pigmented, two-component pure epoxy primer for prepared steel in marine newbuilding, maintenance and repair. It combines abrasion resistance with anticorrosive barrier protection and low-temperature application capability.

It can be applied over an approved, mechanically prepared shop primer or suitably prepared bare steel and is compatible with controlled cathodic protection. International lists it for specified hull, cargo-hold, ballast-tank and tanker-deck systems. The complete primer and overcoat scheme must suit the vessel area, substrate, exposure and required approvals.

The coating has 60% ± 2% volume solids and mixes at 2.5 parts Part A to 1 part ENA303 Part B by volume. The typical specified thickness is 125 microns dry, with a 100–200 micron dry-film range depending on use. Airless spray is recommended; brush and roller are for small areas and may require multiple coats.

Application, drying and recoating depend on substrate temperature and the chosen system. Consult International before application below −5°C and follow the detailed technical and safety documents for preparation, mixing, pot life, dew-point control and overcoating. Confirm the supplied formulation, package sizes and local availability before ordering.

Recommended uses

Prepared bare steel and approved mechanically prepared shop primers in specified marine newbuilding, maintenance and repair systems. Consult International for hull, cargo-hold, ballast-tank and tanker-deck schemes and the required topcoat.

Features

• Abrasion-resistant aluminium-pigmented pure epoxy.
• Two-component universal primer for specified marine systems.
• Compatible with controlled cathodic protection.

Product type

Abrasion-resistant aluminium pure epoxy universal primer

Chemistry

Aluminium-pigmented pure epoxy

Components

Two-component; Part B curing agent ENA303

Colour options

Bronze (ENA300) and Aluminium (ENA301). ENA350 and ENA351 are China-only codes and are not included in this listing.

Finish / sheen

Not applicable

Volume solids

60% ± 2% (ISO 3233:1998)

Mixing ratio

2.50 parts Part A to 1 part Part B by volume. Mix complete supplied units with a power agitator; use within the stated pot life.

Induction period

Not required

Typical dry / wet film thickness

125 microns dry / 208 microns wet. A range of 100–200 microns dry / 167–333 microns wet may be specified according to end use. US TDS: 5 mils dry / 8.3 mils wet; range 4–8 mils dry / 6.7–13.3 mils wet.

Theoretical coverage

4.8 m²/litre at 125 microns dry film thickness. US TDS: 192 sq. ft./US gallon at 5 mils dry film thickness. Allow appropriate loss factors; practical coverage depends on the surface and application.

Application methods

Airless spray. Brush and roller are recommended for small areas only; multiple coats may be required by brush and will be required by roller to achieve the specified film thickness.

Airless spray equipment

Tip range 0.66–0.79 mm (26–31 thou); output fluid pressure at the spray tip at least 211 kg/cm² (3000 psi).

Thinner

International GTA220. Thinning is not normally required. Consult the local representative for extreme conditions and do not exceed local environmental limits.

Cleaner

International GTA822 / GTA220, subject to local legislation. Flush and clean equipment immediately after use. Do not leave mixed material in hoses, guns or equipment, reseal mixed units, or exceed the pot life.

Substrate temperature

May be applied at substrate temperatures down to −15°C (5°F). Consult International before applying below −5°C (23°F). This is a substrate limit; no ambient minimum or maximum is inferred.

Dew point / weather

Apply in good weather. Keep the surface temperature at least 3°C above the dew point. Bring the material to 21–27°C before mixing and application for optimum application properties, unless specifically instructed otherwise.

Touch dry

At substrate temperatures −5°C / 5°C / 25°C / 35°C: 7 hours / 5 hours / 3 hours / 2 hours (ISO 9117/3:2010).

Hard dry

At substrate temperatures −5°C / 5°C / 25°C / 35°C: 10 hours / 8 hours / 6 hours / 3 hours (ISO 9117-1:2009). Hard dry is not a stated full-cure time.

Pot life

At substrate temperatures −5°C / 5°C / 25°C / 35°C: 6 hours / 6 hours / 150 minutes / 60 minutes. Use the shorter special pot lives below when an Intersleek system requires them.

Recoat with Intershield 300, immersed areas

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 14 hours / 9 hours / 7 hours / 4 hours; maximum 14 days at all four temperatures. Follow the intended coating system and regional recommendations.

Recoat with Intershield 300, non-immersed areas

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 14 hours / 9 hours / 7 hours / 4 hours; maximum 6 months / 6 months / 6 months / 3 months. Overcoat only a clean, uncontaminated surface; freshwater and/or solvent wash where needed.

Recoat with Intergard 263 or Intergard 740

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 14 hours / 9 hours / 7 hours / 4 hours; maximum 14 days at all four temperatures. Use the Intergard 740 data for Interbond 201 or Interbond 501.

Recoat with Intergard 269

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 14 hours / 9 hours / 7 hours / 4 hours; maximum 6 months / 6 months / 6 months / 3 months.

Recoat with Interthane 990 or 990E

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 14 hours / 9 hours / 7 hours / 4 hours; maximum 5 days / 5 days / 3 days / 2 days. Reduced intervals for boottop areas require International’s advice.

Recoat with Interfine 691

At substrate temperatures −5°C / 5°C / 25°C / 35°C: minimum 10 hours / 8 hours / 6 hours / 3 hours; maximum 3 days at all four temperatures. Interfine 691 is currently only available in Europe.

Recoat with Interfine 979

Not listed at −5°C. At substrate temperatures 5°C / 25°C / 35°C: minimum 8 hours / 6 hours / 3 hours; maximum 7 days at all three temperatures. Use this data for Interfine 878.

Recoat with Intersleek 717

Not listed at −5°C. At substrate temperatures 5°C / 25°C / 35°C: minimum 9 hours / 7 hours / 4 hours; maximum 14 days at all three temperatures.

Recoat with Intersleek 731

Not listed at −5°C or 5°C. At substrate temperatures 25°C / 35°C: minimum 4 hours / 3 hours; maximum 2 days at both temperatures. At 15°C the separate note requires 5–13 hours; consult International below 15°C.

Recoat with Intersleek 737

Not listed at −5°C. At substrate temperatures 5°C / 25°C / 35°C: minimum 6 hours / 5 hours / 3 hours; maximum 2 days at all three temperatures. Consult the Intersleek guidelines for application down to 0°C. Use this data for Intersleek 386.

Other overcoats

Interfine 691, Interfine 979, Intersleek 717, Intersleek 731 and Intersleek 737 have distinct temperature-dependent intervals. Refer to the current TDS matrix; the Intershield self-recoat interval must not be used for a different overcoat. Interfine 691 is only available in Europe; use Interfine 979 data for Interfine 878, and Intersleek 737 data for Intersleek 386.

Special Intersleek pot life

The global-English TDS requires maximum mixed pot lives of 160 minutes at 0°C; 105 minutes at 15°C; 75 minutes at 25°C; 45 minutes at 35°C when followed by Intersleek 737, 386 or 731. The US-English limitation names 737 and 386. Confirm the regional scheme with International and use the applicable stricter limit.

Special Intersleek overcoating

Intershield 300 may be overcoated with Intersleek 731 above 15°C; at 15°C the stated minimum is 5 hours and maximum 13 hours. Consult International for application below 15°C. Consult the Intersleek application guidelines for Intersleek 737 down to 0°C.

VOC

386 g/litre as supplied, EPA Method 24 (3.22 lb/US gallon); 318 g/kg liquid paint under the EU Solvent Emissions Directive; 329 g/litre under Chinese standard GB23985. Values are typical and may vary with colour and manufacturing tolerances.

Flash point

Part A 28°C; Part B 26°C; mixed 28°C (typical).

Manufacturer unit size

17.5 L mixed unit: 12.5 L Part A in a 20 L container plus 5 L Part B in a 5 L container. Other sizes and local supply must be confirmed with International. This does not confirm store stock.

Unit shipping weight

17.5 L unit: 23.4 kg (typical).

Shelf life / storage

12 months at 25°C, subject to reinspection thereafter. Store unmixed material in closed containers in dry, shaded conditions away from heat and ignition.

Surface preparation

Use the specified marine coating system. Surfaces must be clean, dry and free of oil, grease, soluble contaminants and other foreign matter; use SSPC-SP1 solvent cleaning as needed. Smooth weld seams and sharp edges and remove weld spatter. See the TDS for the preparation standard required by the job.

Newbuilding preparation

Damaged shop-primer areas and welds: Sa2½ blast cleaning or Pt3 power tooling. Intact approved shop primers must be clean, dry and free of soluble salts and contamination. Remove unapproved shop primers by Sa2½ blast cleaning unless International approves a defined sweep-blast procedure.

Major refurbishment preparation

Minimum Sa2 abrasive blast cleaning or International HB2M hydroblasting. Reblast oxidized surfaces to the required visual standard. Slurry blasting to SB2 is allowed with flash rust no worse than SB2M. Hydroblasting and slurry blasting are only recommended for underwater hull, above-water and topside areas. Grind, fill or treat exposed defects as appropriate.

North American preparation equivalents

For marine use in North America: SSPC-SP10 can replace Sa2½; SSPC-SP6 can replace Sa2; SSPC-SP11 can replace Pt3. Repair, tank coatings and Intersleek schemes require International’s specific procedures.

Systems / approvals

Suitable with controlled cathodic protection. Tanker-deck use is subject to Classification Society Regulations. Any grain, ballast-tank, NORSOK or fire-resistance certification applies only as part of an approved scheme. Territorial approvals and potable-water certification depend on formulation and manufacturing site; confirm the exact supplied product and system with International.

Safety / professional use

For professional / industrial use. Read the relevant Canadian safety sheet for both components and follow the container labels. Provide ventilation and suitable protective equipment during application and drying; avoid skin and eye contact. Welding or flame cutting coated metal requires suitable fume extraction and protection; follow ANSI/ASC Z49.1 in North America.