What it is and why choose it
INTERZINC 42 PART A INDIVISIBLE KIT by International Marina is the Part A (base) component of Interzinc 42, a two-component metallic zinc epoxy primer. Designed as the first coat in high-performance coating systems, it provides zinc-rich corrosion protection for steel structures exposed to aggressive industrial and marine environments. Typical applications include offshore facilities, petrochemical plants, pulp and paper mills, bridges and power plants, both in new construction and maintenance projects.
With 55% volume solids, excellent anti-corrosive performance from zinc dust, and compatibility with a wide range of approved topcoats, this primer is suited for professional applicators who require reliable protection and controlled drying times across a broad temperature range.
Main features
- Two-component epoxy-zinc system: metallic zinc primer supplied as Part A (base) and Part B (curing agent) for on-site mixing.
- High zinc content: formulated with zinc powder / zinc dust (stabilized) for strong anti-corrosive performance on correctly prepared steel.
- For aggressive environments: intended for use as part of coating systems on structures in offshore, petrochemical, power generation and other heavy-duty industrial locations.
- Newbuild and maintenance: suitable both as a primer for new construction and for maintenance over properly prepared existing steel or approved prefabrication (shop) primers.
- Versatile application methods: can be applied by airless spray, air spray, and by brush for small areas; roller is not recommended.
- Controlled film build: typical dry film thickness 50–75 microns (2–3 mils); minimum recommended 50 microns (2 mils) and not more than 150 microns (6 mils) to maintain performance and adhesion.
- Multiple colour options: available in red, grey and green with a matt finish; PART A Grey is the grey base component.
- Rapid handling and overcoating: touch dry from 30 to 90 minutes and hard dry from 90 to 300 minutes (depending on temperature), with short minimum overcoating intervals with recommended topcoats.
- Professional-grade formulation: for use only by professional applicators in industrial situations, in compliance with relevant Health, Safety and Environmental regulations.
Technical specifications
- Product type: Epoxy-zinc metallic zinc primer (Part A base component)
- Brand: International Marina (International Protective Coatings / AkzoNobel)
- Colour range: Red, Grey, Green (Interzinc 42); this item: Grey Part A
- Gloss level: Matt
- Volume solids: 55%
- Typical dry film thickness (DFT): 50–75 microns (2–3 mils)
- Typical wet film thickness: 91–136 microns (3.6–5.4 mils)
- Theoretical coverage: 7.33 m²/litre at 75 microns DFT (294 sq.ft/US gallon at 3 mils DFT); practical coverage depends on losses
- Recommended surface profile: 40–75 microns (1.5–3.0 mils) after abrasive blast cleaning
- Minimum DFT for anti-corrosion performance: 50 microns (2 mils)
- Maximum recommended DFT: 150 microns (6 mils)
- Mix ratio (Part A : Part B): 4 parts : 1 part by volume (complete units must be mixed)
- Working pot life (mixed product):
- 10°C (50°F): 24 hours
- 15°C (59°F): 16 hours
- 25°C (77°F): 10 hours
- 40°C (104°F): 5 hours
- Drying and overcoating times (typical, with recommended topcoats):
- At 10°C (50°F): touch dry 90 min; hard dry 5 h; minimum overcoat 4 h; maximum overcoat extended
- At 15°C (59°F): touch dry 60 min; hard dry 4 h; minimum overcoat 3 h; maximum overcoat extended
- At 25°C (77°F): touch dry 45 min; hard dry 150 min; minimum overcoat 2 h; maximum overcoat extended
- At 40°C (104°F): touch dry 30 min; hard dry 90 min; minimum overcoat 90 min; maximum overcoat extended
- Specific gravity (mixed product): 1.94 kg/l (16.2 lb/gal)
- Flash point (typical): Part A 31°C (88°F); Part B 32°C (90°F); mixed 32°C (90°F)
- VOC (typical): 3.43 lb/gal (412 g/l) EPA Method 24; 226 g/kg under EU Solvent Emissions Directive; 389 g/l Chinese National Standard GB23985
- Appearance (Part A Grey): grey liquid, solvent odour; density 2.176 g/cm³ (DIN EN ISO 2811-1)
- Viscosity (Part A Grey): kinematic 73 mm²/s at room temperature; 159 mm²/s at 40°C (DIN EN ISO 3219)
- Shelf life: minimum 12 months at 25°C (77°F); store in dry, shaded conditions away from heat and ignition, subject to re-inspection thereafter
- Recommended thinner: International GTA220 (thinning normally not required; do not exceed local environmental limits)
- Recommended cleaner: International GTA822
- Recommended airless spray tip range: 0.43–0.53 mm (17–21 thou); minimum fluid pressure 162 kg/cm² (2304 psi) at tip
- Recommended conventional spray equipment: DeVilbiss MBC or JGA, air cap 704 or 765, fluid tip E
- Application by brush: suitable for small areas only; typically 50 microns (2.0 mils) DFT achievable
- Application by roller: not recommended
- Pack sizes (typical kit): 10 litre kit (Part A 8 L in 10 L pack; Part B 2 L in 2.5 L pack) and 5 US gal kit (Part A 4 US gal in 5 US gal pack; Part B 1 US gal in 1 US gal pack)
- Typical shipping weight: 10 litre: Part A 19.6 kg; Part B 2.1 kg. 5 US gal: Part A 78.7 lb; Part B 8.4 lb
Applications and use cases
Intended uses
- Primer in multi-coat systems for steel structures operating in aggressive and highly corrosive environments.
- Maintenance coating for previously coated structures where steel can be correctly prepared.
- Primer for new construction steelwork, including large fabricated items and complex structures.
- Application over freshly coated zinc silicate shop primers on structural steel, subject to correct surface preparation.
Typical environments
- Offshore platforms and associated facilities.
- Petrochemical and chemical processing plants.
- Pulp and paper mills.
- Bridges and civil engineering steel structures.
- Power generation plants and related infrastructure.
Surface preparation
- All surfaces must be clean, dry and free from contamination.
- Assess and treat surfaces in accordance with ISO 8504:2000.
- Remove oil and grease by solvent cleaning to SSPC-SP1.
- For bare steel: abrasive blast clean to Sa2½ (ISO 8501-1:2007) or SSPC-SP6. Reblast if oxidation occurs before application.
- Repair surface defects revealed by blasting (grinding, filling or other appropriate treatment).
- For shop primed steel: suitable over zinc silicate shop primers. If breakdown or excessive zinc corrosion products are present, carry out overall sweep blasting. Other shop primer types must be completely removed by abrasive blasting.
- Weld seams and damaged areas: blast clean to Sa2½ (ISO 8501-1:2007) or SSPC-SP6.
- Recommended surface profile: 40–75 microns (1.5–3.0 mils).
Application guidance
- Material is supplied in two containers forming a complete unit. Always mix full units in the supplied proportions.
- Mixing procedure:
- Agitate Base (Part A) with a power agitator.
- Add entire contents of Curing Agent (Part B) to Part A.
- Mix thoroughly with a power agitator until homogeneous.
- Do not reseal mixed units; use within the stated pot life for the ambient temperature.
- Avoid over-application; maintain DFT between 50 and 150 microns, compatible with the blast profile. Low thickness should not be applied over coarse profiles.
- Over-application extends minimum overcoating and handling times and may reduce long-term performance.
- If Interzinc 42 is allowed to weather before topcoating, remove all zinc salts before applying subsequent coats and use only recommended topcoats.
- Surface temperature must be at least 3°C (5°F) above the dew point during application.
- Product will not cure adequately below 5°C (41°F); for maximum performance, ambient curing temperatures should be above 10°C (50°F).
- Not normally recommended for immersed or underwater service.
Compatible systems and topcoats
Interzinc 42 is designed for application to correctly prepared steel and may also be used over approved prefabrication primers. Recommended topcoats include (but are not limited to):
- Intercryl 530
- Intercure 200, Intercure 420
- Interfine 629HS
- Intergard 251, Intergard 269, Intergard 475HS, Intergard 740
- Interseal 670HS
- Interthane 990, Interthane 990E
- Interzone 505, Interzone 954, Interzone 1000
For other suitable topcoats and system designs: Consultar ficha técnica del fabricante.
FAQ
-
What is INTERZINC 42 PART A INDIVISIBLE KIT used for?
It is the Part A base of Interzinc 42, a two-component metallic zinc epoxy primer used as the first coat in protective coating systems for steel structures exposed to aggressive industrial and marine environments.
-
Can it be used on previously shop-primed steel?
Yes, it is suitable for application over steelwork freshly coated with zinc silicate shop primers, provided any extensive breakdown or heavy zinc corrosion is treated by sweep blasting. Other shop primer types must be completely removed by abrasive blasting.
-
What surface preparation is required before application?
Bare steel should be abrasive blast cleaned to Sa2½ (ISO 8501-1:2007) or SSPC-SP6 with a 40–75 micron profile. All surfaces must be clean, dry and free of contamination.
-
Which application methods are recommended?
Airless spray and conventional air spray are recommended for most work. Brush application is suitable for small areas only, while roller application is not recommended.
-
What is the recommended film thickness?
The typical dry film thickness is 50–75 microns (2–3 mils). A minimum of 50 microns is required for anti-corrosive performance, and the dry film thickness should not exceed 150 microns.
-
How long can I use the mixed product (pot life)?
Pot life depends on temperature: approximately 24 h at 10°C, 16 h at 15°C, 10 h at 25°C and 5 h at 40°C. Mixed units should not be resealed.
-
What are the drying and overcoating times?
At 25°C (77°F) Interzinc 42 is typically touch dry in 45 minutes, hard dry in 150 minutes and can be overcoated after 2 hours with recommended topcoats. Lower temperatures increase these times.
-
Is Interzinc 42 suitable for submerged service?
No, it is not normally recommended for underwater conditions. For such applications, Consultar ficha técnica del fabricante.
-
How should equipment be cleaned after use?
Do not allow the material to remain in hoses, guns or spray equipment. Thoroughly flush all equipment with International GTA822 immediately after use and periodically during the working day.
-
Who should apply this product?
The product is intended only for professional applicators in industrial environments, working in accordance with the Safety Data Sheet and applicable regulations.
Section 14 – Transport information
Based on the Safety Data Sheet for Interzinc 42 Grey Part A, typical transport classification is as follows (actual transport classification for the supplied kit must be verified on the product label and current documentation):
- UN number / ID number: UN1263
- UN proper shipping name: PAINT
- Transport hazard class: 3 (flammable liquid)
- Packing group: III
- ADR/RID: Class 3, Packing Group III; environmentally hazardous; tunnel restriction code (D/E). The environmentally hazardous substance mark is not required when transported in packages ≤5 L or ≤5 kg.
- IMDG: Class 3, Packing Group III; marine pollutant (Zinc powder – zinc dust (stabilized), solvent naphtha (petroleum), light arom.); emergency schedules F-E, S-E; segregation group not applicable. The marine pollutant mark is not required for packages ≤5 L or ≤5 kg.
- IATA: Class 3, Packing Group III; environmentally hazardous substance mark may appear if required by specific transport regulations.
- Special precautions for user: transport within user’s premises only in closed, upright and secure containers. Ensure transport personnel know what to do in case of accident or spillage.
Section 8 – Individual protection measures
The following personal protective equipment (PPE) and exposure control measures are derived from the Safety Data Sheet for Interzinc 42 Grey Part A and apply to professional and industrial use:
Engineering controls
- Use only with adequate ventilation.
- Employ process enclosures, local exhaust ventilation or other engineering controls to keep airborne concentrations below occupational exposure limits and below lower explosive limits.
- Use explosion-proof ventilation and electrical equipment.
Hygiene measures
- Wash hands, forearms and face thoroughly after handling and before eating, drinking or smoking.
- Remove contaminated clothing and protective equipment before entering eating areas.
- Contaminated work clothing should not leave the workplace and should be washed before reuse.
- Ensure eyewash stations and safety showers are close to the work area.
Eye and face protection
- Wear chemical splash goggles complying with an approved standard when there is risk of eye contact.
- Eye protection must be selected based on risk assessment to prevent exposure to splashes, mists, gases or dusts.
Hand protection
- Use chemical-resistant, impervious gloves complying with EN374 or equivalent when handling the product.
- For prolonged or frequently repeated contact: gloves with protection class 6 (breakthrough time > 480 min) are recommended; glove materials such as Viton or Nitrile with thickness ≥ 0.38 mm.
- For brief contact: gloves with protection class 2 or higher (breakthrough time > 30 min); recommended Nitrile gloves with thickness ≥ 0.12 mm.
- Replace gloves regularly and immediately if damaged. Performance can be reduced by physical or chemical damage or poor maintenance.
Skin and body protection
- Select protective clothing based on the specific task and associated risks, approved by a safety specialist.
- When there is a risk of ignition from static electricity, wear anti-static protective clothing in accordance with EN 1149. For maximum protection, clothing should include anti-static overalls, boots and gloves.
- Use additional footwear and other skin protection as required by the work being performed.
Respiratory protection
- Select an appropriate respirator based on hazard level and potential exposure, in line with relevant standards or certifications.
- Respirators must be used under a formal respiratory protection program that covers fit testing, training, maintenance and correct use.
Environmental exposure controls
- Check emissions from ventilation and process equipment to ensure compliance with environmental protection legislation.
- Where necessary, use fume scrubbers, filters or engineering modifications to keep emissions at acceptable levels.
Contenido generado por IA
