What is Interprime 539 and why choose it?
INTERPRIME 539 from International Marina is a single-pack, chromate free etch primer based on modified polyvinyl butyral and phosphoric acid. It is designed as an above-water pretreatment coating that chemically etches and seals non‑ferrous metal surfaces, providing excellent adhesion for subsequent paint systems. It is particularly suitable for priming galvanised steel and aluminium surfaces in marine environments, both in newbuilding and maintenance projects.
By combining fast drying, good adhesion promotion and zinc chromate–free technology, Interprime 539 is a practical solution wherever non‑ferrous substrates need reliable pretreatment before application of high performance marine coatings.
Main features
- Chromate free etch primer: modified polyvinyl butyral/phosphoric acid formulation, free from zinc chromate.
- Designed for non‑ferrous metals: promotes adhesion and seals aluminium, galvanised steel and other non‑ferrous substrates above the waterline.
- Marine-focused: suitable for Newbuilding, Maintenance & Repair and On Board Maintenance in marine environments.
- Single-pack product: no mixing ratio or separate curing agent required; simply stir thoroughly before use.
- Fast drying: touch dry from 10 minutes at 40°C to 30 minutes at 5°C; hard dry from 20 to 60 minutes depending on temperature.
- Multiple application methods: compatible with airless spray, conventional spray, brush and roller.
- Matt finish: provides a low-sheen base (matt to ISO 2813:1978) for subsequent coats.
- Compatible overcoat: can be overcoated with Interprime 198 after short minimum intervals (from 60 minutes at 25–40°C, 2 hours at 5°C).
- Solvent-borne system: formulated as a solvent-borne coating for interior and exterior use.
Technical specifications
- Product type: chromate free etch primer, modified polyvinyl butyral/phosphoric acid
- Colour: VTA538 Yellow
- Finish/Sheen: Matt (ISO 2813:1978)
- Components: single pack (Part B not applicable; no mix ratio)
- Volume solids: 24% ±2% (ISO 3233:1998)
- Typical dry film thickness (DFT): 15 microns (63 microns wet)
- Theoretical coverage: 16.00 m²/litre at 15 microns DFT (allow appropriate loss factors)
- Flash point: 28°C (single pack; closed cup)
- VOC (as supplied): 744 g/L (EPA Method 24); 701 g/kg of liquid paint (EU Solvent Emissions Directive 1999/13/EC)
- Density: approximately 1.055–1.058 g/cm³ (DIN EN ISO 2811-1)
- Typical viscosity (kinematic): ~130–138 mm²/s (DIN EN ISO 3219)
- Solubility in water: not soluble in cold water (OECD TG 105)
- Recommended thinner/cleaner: International GTA220 (thinning only in exceptional cases and within local environmental limits)
- Airless spray settings: tip range 0.25–0.38 mm (10–15 thou); minimum fluid pressure at tip 112 kg/cm² (1590 psi)
- Available unit sizes: 5 L and 1 US gal packs (Part A)
- Typical shipping weight: approx. 5.8 kg (5 L); 9.6 lb (1 US gal)
- Shelf life: minimum 12 months at 25°C; store in dry, shaded conditions away from heat and ignition sources
Drying and overcoating (at recommended DFT)
- Touch dry (ISO 9117/3:2010):
- 5°C: 30 minutes
- 15°C: 20 minutes
- 25°C: 15 minutes
- 40°C: 10 minutes
- Hard dry (ISO 9117-1:2009):
- 5°C: 60 minutes
- 15°C: 45 minutes
- 25°C: 30 minutes
- 40°C: 20 minutes
- Overcoating with Interprime 198 (minimum intervals):
- 5°C: 2 hours (maximum: extended)
- 15°C: 60 minutes (maximum: extended)
- 25°C: 60 minutes (maximum: extended)
- 40°C: 60 minutes (maximum: extended)
Applications and use cases
Intended uses
- Above-water pretreatment primer for non‑ferrous metals, designed to promote adhesion and seal the surface prior to topcoat systems.
- Particularly suitable for galvanised steel surfaces where blast cleaning is not possible.
- Aluminium and light alloys: used as a chemical etch after solvent cleaning, followed by a compatible aluminium paint system.
- Marine sectors: Newbuilding, Maintenance & Repair and On Board Maintenance.
Surface preparation (summary)
- General: all surfaces must be clean, dry and free from contamination. Use high-pressure fresh water or fresh water wash and solvent cleaning to SSPC‑SP1 to remove oil, grease, salts and other contaminants.
- Preferred preparation for most non‑ferrous and galvanised steel: brush blasting or mechanical abrasion using fine abrasive (0.2–0.5 mm) at low air pressure with nozzle held about 1 m from surface. Interprime 539 is specified where such treatment is not possible.
- Non‑ferrous metals: ensure surface is free of corrosion products. For aluminium or light alloys, solvent clean then chemically etch with Interprime 539, followed by an appropriate aluminium paint system.
- Galvanised steel: degrease to SSPC‑SP1 and remove white zinc corrosion products by hand or power-tool cleaning.
Application guidance (summary)
- Stir thoroughly with a power agitator before application (single-pack coating).
- Application methods: airless spray, conventional spray, brush or roller (all recommended).
- Thinning: not recommended; in exceptional cases up to 10% International GTA220 may be added for airless spray to aid penetration, subject to local legislation.
- Apply in good weather with substrate temperature at least 3°C above the dew point.
- Do not apply or cure below 5°C; for maximum performance, curing temperature should be above 10°C.
- Avoid excessive film thickness, which may cause splitting when overcoated with high-build systems.
- Avoid over-application of strong-solvent topcoats, which can soften Interprime 539 and lead to adhesion loss.
- Not suitable for underwater or boottop areas.
FAQ
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Is Interprime 539 suitable for submerged areas or boottops?
No. The product is not suitable for use on underwater or boottop areas.
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On which substrates can I use Interprime 539?
It is intended for non‑ferrous metals above the waterline, particularly galvanised steel and aluminium/light alloys, where it promotes adhesion and seals the surface before overcoating.
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Do I need to mix two components before application?
No. Interprime 539 is a single-pack coating with no curing agent or mix ratio. It must, however, be stirred thoroughly with a power agitator before use.
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What is the recommended dry film thickness and coverage?
The typical dry film thickness is 15 microns (63 microns wet), giving a theoretical coverage of about 16.00 m² per litre at that thickness, before allowing for losses.
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How soon can I overcoat Interprime 539?
When overcoating with Interprime 198, minimum intervals range from 2 hours at 5°C to 60 minutes at 15–40°C, with extended maximum overcoating periods.
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Can I thin Interprime 539?
Thinning is generally not recommended. In exceptional cases, up to 10% of International GTA220 may be used with airless spray, within the limits of local environmental legislation.
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What happens if I apply too thick a film?
Excessive film thickness can lead to splitting or separation of the film when overcoated with high-build systems and should be avoided.
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Is the product flammable?
Yes. Interprime 539 is classified as a flammable liquid, Category 3, with a flash point of 28°C. It should be kept away from heat, hot surfaces, sparks, open flames and other ignition sources.
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What are the main health hazards?
The product can cause skin and eye irritation, may cause an allergic skin reaction, and may cause respiratory irritation, drowsiness or dizziness. Prolonged or repeated exposure may damage organs. It also contains hazardous solvents; vapour concentrations above occupational limits must be avoided.
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How should I clean equipment after application?
Flush and clean all equipment immediately with International GTA220. Partially filled containers may skin or increase in viscosity during storage and material should be filtered before reuse.
Section 14 – Transport information
The following transport data are taken from the safety documentation for Interprime 539 Yellow:
- UN number / ID number: UN1263
- Proper shipping name: PAINT
- Transport hazard class: Class 3 (flammable liquid)
- Packing group: III
- Modes and classifications:
- ADR/RID: UN1263, PAINT, Class 3, PG III, Tunnel code (D/E)
- IMDG: UN1263, PAINT, Class 3, PG III, Emergency schedules F‑E, S‑E
- IATA: UN1263, PAINT, Class 3, PG III
- Environmental hazards (IMDG/IATA/ADR): No (not classified as marine pollutant in these entries).
- On-site transport precautions: always move containers in closed, upright and secure condition, and ensure personnel know procedures in case of spill or accident.
Section 8 – Personal protective measures
The following individual protection measures are extracted from the safety data information for Interprime 539 Yellow. They apply during handling, mixing, application and cleaning.
Engineering controls and hygiene
- Use only with adequate ventilation; employ process enclosures or local exhaust to keep airborne concentrations below occupational limits and below lower explosive limits.
- Use explosion-proof ventilation and electrical equipment.
- Wash hands, forearms and face thoroughly after handling and before eating, drinking, smoking or using the lavatory.
- Remove contaminated clothing and protective equipment before entering eating areas; wash contaminated clothing before reuse.
- Ensure eyewash stations and safety showers are located close to the work area.
Eye and face protection
- Use safety eyewear compliant with an approved standard.
- Where liquid splashes or mist may occur, use chemical splash goggles.
Hand protection
- Wear chemical‑resistant, impervious gloves complying with an approved standard.
- For prolonged or frequently repeated contact, gloves with protection class 6 (breakthrough time >480 minutes, EN374) are recommended; for example Viton or nitrile gloves with thickness ≥0.38 mm.
- For brief contact, gloves with protection class ≥2 (breakthrough time >30 minutes, EN374) such as nitrile gloves with thickness ≥0.12 mm are recommended.
- Replace gloves regularly and whenever damaged; verify with the glove manufacturer that breakthrough times are adequate for the specific conditions.
Skin and body protection
- Select protective clothing based on the task and risks; approval by a safety specialist is recommended.
- Where there is a risk of ignition from static electricity, wear anti‑static protective clothing such as anti‑static overalls, boots and gloves (see EN 1149 guidance).
- Use appropriate footwear and any additional skin protection as required by the risk assessment.
Respiratory protection
- When ventilation is insufficient or exposure limits may be exceeded, wear a respirator conforming to EN140 with type A/P2 filter or better.
- Respiratory protection must be used within a formal respiratory protection programme to ensure correct selection, fitting and training.
- Dry sanding, welding or flame cutting of the dry paint film can generate hazardous dust and fumes; whenever possible use wet sanding/flatting and provide local exhaust ventilation and/or suitable respiratory protection.
*Contenido generado por IA
