INTERIOR PRIMER CONVERTER

What is ALEXSEAL Interior Primer Converter C1787 and why choose it?

ALEXSEAL Interior Primer Converter C1787 is the dedicated hardener for the ALEXSEAL Interior Primer 178 epoxy system. Based on polyamine/amino adduct technology, it is designed for industrial serial painting and professional marine applications where fast drying, reliable curing and durable corrosion protection are required. Used in the specified mixing ratio with ALEXSEAL Interior Primer 178, it delivers a mechanically resistant, chemically resistant primer film on steel, aluminium and compatible composite substrates.

Main features

• System-specific converter for ALEXSEAL Interior Primer 178, ensuring correct curing and performance.
• Fast drying in combination with the primer, enabling short recoating and overcoating times.
• Epoxy-based hardener using polyamine/amino adduct chemistry for strong mechanical and chemical resistance.
• Optimised for spray, brush and roller application with defined mixing ratios and reducer levels.
• Professional marine approval when used as part of the Interior Primer 178 system, which is certified as low flame-spread marine paint according to IMO Resolution MSC.307 (88) (FTP Code 2010).
• Low odor primer system when combined with ALEXSEAL Interior Primer 178, improving comfort in interior work areas.

Technical characteristics

Chemical nature

• Converter type: Hardener based on polyamine / amino adduct.
• Use: Industrial serial painting; professional use only.

Physical properties (converter as supplied)

• Physical state: Liquid (20 – 25 °C, 1,013 hPa).
• Colour: According to product name.
• Odour: Amine-like.
• Boiling range: Approximately 120 °C.
• Flash point: 27 °C (ISO 13736).
• Auto-ignition temperature: > 400 °C.
• pH: 6 – 9 at 20 °C (10 % solution).
• Viscosity (kinematic): > 21 mm²/s.
• Flow time: > 90 s (DIN 53211, 4 mm); > 60 s (ISO 2431, 6 mm).
• Water solubility: Insoluble; immiscible with water.
• Vapour pressure: Approximately 11 hPa at 20 °C; approx. 100 hPa at 50 °C.
• Density: Approx. 0.95 g/cm³ at 20 °C.
• VOC content (mixture as classified): 59.81 %, 570 g/l (Directive 2010/75/EU).

Classification and hazards (REGULATION (EC) No 1272/2008)

• Flammable liquids, Category 3 (H226: Flammable liquid and vapour).
• Skin irritation, Category 2 (H315: Causes skin irritation).
• Serious eye damage, Category 1 (H318: Causes serious eye damage).
• Specific target organ toxicity – single exposure, Category 3, respiratory system (H335: May cause respiratory irritation).
• Specific target organ toxicity – single exposure, Category 3, central nervous system (H336: May cause drowsiness or dizziness).
• Long-term (chronic) aquatic hazard, Category 3 (H412: Harmful to aquatic life with long lasting effects).

Mixing and application within the ALEXSEAL Interior Primer 178 system

Compatible primer

• Base materials:
  • P1780 ALEXSEAL Interior Primer 178 White (1 Gal).
  • P1783 ALEXSEAL Interior Primer 178 Light Gray (1 Gal).
• Converter: C1787 ALEXSEAL Interior Primer Converter (1 QT).
• Reducer: R1789 ALEXSEAL Interior Primer Reducer Spray & Brush (1 Gal).

Recommended mixing ratios

• Spray application
  • 4 parts by volume ALEXSEAL Interior Primer Base 178 (P178x).
  • 1 part by volume ALEXSEAL Interior Primer Converter C1787.
  • 30 % reduction by volume with ALEXSEAL Interior Primer Reducer R1789.
    • Example ratio: 4 : 1 : 1½ (base : converter : reducer) = 30 % reduction.
• Brush and roller application
  • 4 parts by volume ALEXSEAL Interior Primer Base 178 (P178x).
  • 1 part by volume ALEXSEAL Interior Primer Converter C1787.
  • Minimum 15 % reduction by volume with ALEXSEAL Interior Primer Reducer R1789.
    • Example ratio: 4 : 1 : ¾ (base : converter : reducer) = 15 % reduction.
• The amount of reducer may vary depending on application conditions.
• Mixed material must be filtered before application.

Application equipment data (for the mixed primer system)

• Viscosity for spray: DIN 4 cup 4 mm ≈ 35 s (30 % reduction).
• Viscosity for roll: DIN 4 cup 4 mm ≈ 70 s (15 % reduction).
• Nozzle size gravity gun: 1.4 – 1.7 mm (conventional and HVLP).
• Nozzle size siphon cup: 1.6 mm (conventional and HVLP).
• Fluid nozzle size pressure pot: 1.2 – 1.4 mm (conventional and HVLP).
• Atomizing pressure: 3.0 – 4.0 bar (44 – 58 PSI) conventional and HVLP.
• Pot pressure: 1.0 – 2.0 bar (15 PSI) conventional and HVLP.
• Recommended by spraying: apply 2 coats to a total wet film thickness (WFT) of 400 – 500 µm (8 – 10 mils), achieving a dry film thickness (DFT) of 200 – 250 µm (8 – 10 mils).

Applications and use cases

• Interior marine structures: Use with ALEXSEAL Interior Primer 178 on steel and aluminium components inside vessels where low flame-spread characteristics are required.
• Industrial metal protection: As part of the epoxy primer system on properly prepared steel and aluminium substrates requiring good chemical and mechanical resistance.
• Composite interiors: When the substrate gelcoat (80–100 grit) and fiberglass resin (36–60 grit) have been properly ground and the Interior Primer 178 system is specified.
• Adhesion-promoting primer layers: In combination with Interior Primer 178 to enhance adhesion for subsequent interior topcoats such as ALEXSEAL N-Series Interior Topcoat 578.
• Areas with low aesthetic requirements: The primed surface can be left without topcoat in zones where appearance is not critical, while still providing corrosion protection.

FAQ – ALEXSEAL Interior Primer Converter C1787

1. Is C1787 a standalone coating?

   No. C1787 is a converter (hardener) and must be mixed with ALEXSEAL Interior Primer Base 178 (P178x) and the specified reducer R1789.

2. What is the recommended mixing ratio for spray application?

   Use 4 parts Interior Primer Base 178, 1 part Converter C1787 and approximately 30 % by volume of Reducer R1789 (example 4 : 1 : 1½).

3. Can I brush or roll the primer system with the same converter?

   Yes. Use the same 4 : 1 base to converter ratio with a minimum 15 % reduction with R1789 (example 4 : 1 : ¾).

4. On which substrates can the Interior Primer 178 system be used with C1787?

   On properly cleaned and prepared steel and aluminium, and on ground gelcoat and fiberglass resin before an interior topcoat application.

5. What are the optimal environmental conditions during application and drying?

   The optimal application environment for the mixed system is between 15 °C (60 °F) and 30 °C (85 °F) with relative humidity from 40 % to 70 %. The minimum object temperature during drying is 15 °C (68 °F), and conditions should be at least 3 °C above the dew point.

6. How long is the pot life of the mixed material?

   At 15 °C the pot life is approximately 6 hours, at 20 °C about 4 hours, and at 25 °C about 3 hours.

7. When can I recoat with another layer of Interior Primer 178?

   By spraying: minimum 3 hours at 15 °C, 2 hours at 20 °C, or 1.5 hours at 25 °C (maximum 3 months). By rolling: minimum 6 hours at 15 °C, 4 hours at 20 °C, or 3 hours at 25 °C (maximum 3 months).

8. When can the primed surface be overcoated with ALEXSEAL N-Series Interior Topcoat 578?

   After a minimum of 12 hours at 15 °C, 8 hours at 20 °C, or 6 hours at 25 °C, with a maximum overcoating interval of 14 days.

9. Is C1787 classified as hazardous?

   Yes. It is classified as a flammable liquid, skin irritant, causing serious eye damage and possible respiratory irritation and drowsiness or dizziness, and as harmful to aquatic life with long lasting effects.

10. Is this product suitable for non-professional users?

    No. The product and the associated primer system are designated for professional use only.

Section 14 – Transport information

• UN number or ID number
  • ADR: UN 1263
  • IMDG: UN 1263
  • IATA: UN 1263
• UN proper shipping name
  • ADR: PAINT RELATED MATERIAL
  • IMDG: PAINT RELATED MATERIAL
  • IATA: PAINT RELATED MATERIAL
• Transport hazard class: Class 3 (flammable liquids) for ADR, IMDG and IATA.
• Packing group: III (ADR, IMDG, IATA).
• ADR details
  • Classification code: F1.
  • Hazard identification number: 30.
  • Labels: 3.
  • Tunnel restriction code: (D/E).
• IMDG details
  • Labels: 3.
  • EmS code: F-E, S-E.
• IATA details
  • Cargo aircraft packing instruction: 366 (Packing group III, Flammable Liquids label).
  • Passenger aircraft packing instruction: 355 (Packing group III, Flammable Liquids label).
  • Limited quantity packing instruction: Y344.
• Environmental hazards
  • ADR: Not classified as environmentally hazardous.
  • IMDG: Not classified as a marine pollutant.
• Special precautions for user
  • When transported within the user’s premises, always move the product in closed, upright and secure containers.
  • Ensure that personnel handling transport containers are aware of the procedures in case of incident or spillage.
  • ADR: Receptacles with less than 450 litres capacity are not subject to ADR according to ADR 2.2.3.1.5.
  • IMDG: Receptacles with less than 450 litres capacity are not subject to IMDG chapters 4.1, 5.2 and 6.1 according to IMDG 2.3.2.5.
• Bulk transport: Maritime transport in bulk according to IMO instruments is not applicable for the product as supplied.

Section 8 – Individual protection measures

Engineering controls

• Provide adequate ventilation. Where practicable, use local exhaust ventilation and general extraction.
• If ventilation does not keep concentrations below occupational exposure limits, suitable respiratory protection must be used.

Personal protective equipment

• Eye and face protection
  • Wear safety goggles to protect against solvent splashes.
• Hand protection
  • Use chemical-resistant protective gloves tested according to EN 374.
  • Recommended materials for splash protection: nitrile rubber or neoprene.
  • Minimum material thickness: > 0.4 mm.
  • Minimum breakthrough time: > 480 minutes.
  • Gloves must be checked for workplace suitability and replaced immediately when damaged or worn.
• Skin and body protection
  • Wear suitable protective clothing adapted to the potential for dangerous or explosive atmospheres.
• Respiratory protection
  • If exposure limits may be exceeded, use an appropriate certified respirator.
  • Recommended: half-mask model with cartridge or air-fed equipment.
• General protective measures
  • Do not eat, drink or smoke during use.
  • Avoid contact with skin, eyes and clothing.
  • Avoid inhalation of vapours, dust from sanding, particulates and spray mist arising from application.
  • Wash contaminated skin immediately and use preventive skin protection creams where appropriate.

*Contenido generado por IA