What it is and why choose it
INTERTHANE 990 SG PART A INDIVISIBLE KIT is the base component of Interthane 990SG, a two-component aliphatic acrylic polyurethane finish designed to deliver excellent durability and long term recoatability. This semi-gloss industrial topcoat is suitable for both new construction and maintenance projects, especially where a high-gloss appearance is not desired. Its high volume solids and versatile application methods make it a reliable choice for demanding protective coating systems.
Main features
- Two-component aliphatic acrylic polyurethane finish for robust protective systems.
- Excellent durability, engineered for long service in industrial environments.
- Long term recoatability, with extended overcoating intervals with itself at a wide range of temperatures.
- Semi-gloss finish, ideal where a non–high-gloss appearance is preferred.
- High volume solids of 72% ± 3% (depending on colour) for efficient film build.
- Wide colour availability via the Chromascan tinting system.
- Flexible application by air spray, airless spray, brush or roller.
- Compatible with approved primers and intermediates including Intercure, Intergard, Interseal, Interzinc and Interzone systems.
- Not recommended for immersion conditions, helping specifiers correctly position the product in coating schemes.
Technical specifications
General product data
- Product type: Two-component aliphatic acrylic polyurethane finish (Part A base component).
- Brand: International (AkzoNobel).
- Finish: Semi-gloss.
- Colour range: Wide range via the Chromascan system.
- Volume solids: 72% ± 3% (depends on colour).
- Typical dry film thickness (DFT): 50–75 microns (2–3 mils).
- Typical wet film thickness (WFT): 69–104 microns (2.8–4.2 mils).
- Theoretical coverage: 14.40 m²/litre at 50 microns DFT (stated volume solids) / 577 sq.ft/US gallon at 2 mils DFT.
- Practical coverage: Allow appropriate loss factors.
- Recommended application methods: Air spray, airless spray, brush, roller.
Drying and overcoating (self-overcoating)
- 5°C (41°F): Touch dry 5 h; hard dry 24 h; minimum overcoat 24 h; maximum Extended.
- 15°C (59°F): Touch dry 2.5 h; hard dry 10 h; minimum overcoat 10 h; maximum Extended.
- 25°C (77°F): Touch dry 1.5 h; hard dry 6 h; minimum overcoat 6 h; maximum Extended.
- 40°C (104°F): Touch dry 1 h; hard dry 3 h; minimum overcoat 3 h; maximum Extended.
Mixing and pot life
- Components: Part A (Base) + Part B (Curing Agent).
- Mix ratio: 6 parts : 1 part by volume (Part A : Part B).
- Working pot life after mixing:
- 5°C (41°F): 7 hours
- 15°C (59°F): 3.5 hours
- 25°C (77°F): 2 hours
- 40°C (104°F): 45 minutes
- Mixing method:
- Agitate Base (Part A) with a power agitator.
- Add entire contents of Curing Agent (Part B) and mix thoroughly with power agitator.
- Always mix and use a complete unit in the supplied proportions; use within the stated pot life.
Application parameters
- Airless spray:
- Tip range: 0.33–0.45 mm (13–18 thou).
- Total fluid pressure at tip: not less than 155 kg/cm² (2204 p.s.i.).
- Air spray (pressure pot):
- Recommended gun: DeVilbiss MBC or JGA.
- Air cap: 704 or 765.
- Fluid tip: E.
- Brush: Suitable; typically 50–75 microns (2.0–3.0 mils) can be achieved.
- Roller: Suitable; typically 50–75 microns (2.0–3.0 mils) can be achieved.
- Thinner: International GTA713 (or International GTA733 or International GTA056). Do not thin more than allowed by local environmental legislation.
- Cleaner: International GTA713 or (International GTA733 or International GTA056).
- Surface temperature during application: Must always be at least 3°C (5°F) above the dew point.
Surface preparation
- All surfaces must be clean, dry and free from contamination prior to coating.
- Assess and prepare surfaces in accordance with ISO 8504:2000 or ISO 8504:2019 (depending on data sheet version).
- Remove oil and grease in accordance with SSPC-SP1 solvent cleaning.
- Apply Interthane 990SG only over a recommended anti-corrosive coating scheme.
- The primer surface must be dry and free from contamination, and Interthane 990SG applied within the specified overcoating intervals.
- Areas of breakdown or damage should be prepared to the specified standard (e.g. Sa2½ to ISO 8501-1:2007, or SSPC-SP6 Abrasive Blasting, or SSPC-SP11 Power Tool Cleaning) and patch primed before application.
Regulatory and physical data
- Product weight: 1.47 kg/l (12.3 lb/gal).
- Flash point (typical):
- Part A: 34°C (93°F).
- Part B: 49°C (120°F).
- Mixed product: 35°C (95°F).
- VOC: 236 g/kg (EU Solvent Emissions Directive, Council Directive 2010/75/EU). Note: VOC values are typical and provided for guidance only and may vary with colour and manufacturing tolerances.
Systems compatibility
Interthane 990SG is designed to be used over approved primers and intermediates and to be overcoated only with itself.
- Recommended primers/intermediates:
- Intercure 200, Intercure 200HS, Intercure 420
- Intergard 251, Intergard 2511, Intergard 251HS, Intergard 269, Intergard 475HS
- Interseal 1052, Interseal 670HS
- Interzinc 315, Interzinc 52, Interzinc 52HS
- Interzone 954
- Topcoats: Interthane 990SG should only be overcoated with itself.
Pack sizes and shipping weight (Part A indivisible kit)
- Pack sizes (units):
- 20 litre unit: Part A 17.14 litre (in 20 litre pack); Part B 2.86 litre (in 3.7 litre pack).
- 5 litre unit: Part A 4.29 litre (in 5 litre pack); Part B 0.71 litre (in 1 litre pack).
- Typical shipping weight:
- 20 litre unit: Part A 26.9 kg; Part B 3.5 kg.
- 5 litre unit: Part A 7 kg; Part B 0.9 kg.
Storage
- Shelf life (example data sheet 2021): 24 months (Part A) and 12 months (Part B) minimum at 25°C (77°F), subject to re-inspection thereafter.
- Shelf life (example data sheet 2025): 24 months (Part A) and 18 months (Part B) minimum at 25°C (77°F), subject to re-inspection thereafter.
- Storage conditions: Store in dry, shaded conditions away from sources of heat and ignition.
Applications and use cases
- New construction: Used as a semi-gloss polyurethane finish over appropriate anti-corrosive systems on structural steel and other suitable substrates.
- Industrial maintenance: Applied as a maintenance topcoat over existing compatible systems where long term recoatability is required.
- Offshore structures: Suitable for use in offshore environments when used within a recommended coating scheme.
- Petrochemical and chemical facilities: Suitable for facilities including petrochemical plants.
- Bridges: Used as a finishing coat on bridge structures as part of an approved system.
- Pulp and paper mills: Suitable for use in pulp and paper industry environments.
- Power industry: Can be used on structures within the power industry.
- Non-immersion service: The product is not recommended for immersion conditions. Where severe chemical or solvent splashing is expected, suitability should be confirmed with International Protective Coatings.
- Appearance control: Particularly designed for areas where a high gloss is not desired and a semi-gloss finish is preferred.
FAQ
1. What type of coating is INTERTHANE 990 SG PART A INDIVISIBLE KIT?
It is the base component (Part A) of Interthane 990SG, a two-component aliphatic acrylic polyurethane finish supplied as part of an indivisible kit with Part B (curing agent).
2. In which environments can Interthane 990SG be used?
It can be used in new construction and industrial maintenance across various environments including offshore structures, petrochemical facilities, bridges, pulp and paper mills, and the power industry, within a suitable coating scheme.
3. What finish does this product provide?
It provides a semi-gloss finish and is intended for areas where high gloss is not desired or where semi-gloss is preferred.
4. What is the recommended dry film thickness?
The typical dry film thickness per coat is 50–75 microns (2–3 mils), equivalent to 69–104 microns (2.8–4.2 mils) wet.
5. Can Interthane 990SG be applied by brush and roller?
Yes. Brush and roller application are suitable, and typically 50–75 microns (2.0–3.0 mils) can be achieved. In some colours, two or more coats may be required for uniform coverage.
6. Over which primers can Interthane 990SG be applied?
Recommended primers and intermediates include Intercure 200/200HS/420, Intergard 251/2511/251HS/269/475HS, Interseal 1052/670HS, Interzinc 315/52/52HS and Interzone 954.
7. What is the mixing ratio between Part A and Part B?
The mixing ratio is 6 parts of Part A to 1 part of Part B by volume.
8. Is Interthane 990SG suitable for immersion service?
No. The product is not recommended for use in immersion conditions.
9. How should equipment be cleaned after application?
All equipment should be thoroughly cleaned with International GTA713, or alternatively with International GTA733 or International GTA056, immediately after use.
10. What happens if condensation occurs during drying?
Condensation during or immediately after application may result in a matt finish and an inferior film.
Section 14 – Transport information
Consultar ficha técnica del fabricante.
Section 8 – Personal protection measures
- This product is intended for use only by professional applicators in industrial situations, following the advice in the Technical Data Sheet, Safety Data Sheet and on the container(s).
- All work involving application and use of this product should comply with relevant national Health, Safety and Environmental standards and regulations.
- When applying Interthane 990SG in confined spaces, ensure adequate ventilation and, where necessary, local exhaust ventilation.
- During welding or flame cutting on metal coated with this product, dust and fumes will be emitted; appropriate personal protective equipment and adequate local exhaust ventilation are required.
- Warning: Contains isocyanate. For spray application, an air-fed hood should be worn.
*Contenido generado por IA
