What INTERTHERM 50 is and why choose it
INTERTHERM 50 by International Marina is a single component, high temperature silicone coating designed to protect steel against corrosion in demanding hot service conditions. Based on a moisture curing silicone binder, it allows multiple coats to be applied without heat curing and is suitable for continuous dry temperatures up to 540°C (1004°F), when correctly specified. Available in aluminium and black versions, it is engineered specifically for flare stacks, chimneys, exhausts, vents and pipework.
Main features
- High temperature resistance: suitable for steel operating at continuous dry temperatures up to 540°C (1004°F) for the aluminium version, and up to 400°C (752°F) for the black version, depending on surface preparation.
- Moisture curing silicone binder: crosslinks with ambient moisture, allowing application of multiple coats without the need for heat curing.
- Corrosion protection for hot steel: protects steel in areas such as flare stacks, chimneys, exhaust systems, vents and hot pipework.
- Optimised film build: typical dry film thickness of 25 microns (1 mil); up to 3 coats at 25 microns per coat can be applied without heating between coats.
- Application flexibility: can be applied by air spray, brush or roller, using suitable equipment.
- Available colours: aluminium and black. The aluminium version is recommended where possible due to its superior performance.
- Compatibility with zinc silicate primers: designed to be used over inorganic zinc primers such as Interzinc 22 or Interzinc 2280 where maximum corrosion protection is required.
- Slow colour change control: use of an aluminium sealing coat under black can minimise colour change in corrosive environments when applied over zinc silicate primers.
- Specification approvals (aluminium version): BS5493 (1977) CP7 and Shell Specification DEP 40.48.00.30 Gen. Chapter VI (h).
Technical specifications
General product data
- Type: single component high temperature coating based on a moisture curing silicone binder.
- Colour: aluminium, black.
- Gloss level: not applicable.
- Volume solids: 45%.
- Typical dry film thickness (DFT): 25 microns (1 mil) per coat.
- Typical wet film thickness (WFT): 56 microns (2.2 mils) per coat.
- Maximum single coat thickness without blistering on heating: 40 microns (1.6 mils).
- Maximum number of coats without heating between coats: up to 3 coats at 25 microns (1 mil) per coat.
Covers and spreading rates
- Theoretical coverage: 18 m²/litre at 25 microns DFT and stated volume solids (722 sq.ft/US gallon at 1 mil DFT).
- Practical coverage: subject to appropriate loss factors.
Drying and overcoating times (at 25°C / 77°F)
- Touch dry: 30 minutes.
- Hard dry: 2 hours.
- Minimum overcoating interval: 12 hours with recommended topcoats.
- Maximum overcoating interval: extended.
Drying and overcoating times vary with temperature:
- At 5°C (41°F): touch dry 90 minutes; hard dry 5 hours; minimum overcoat 24 hours; maximum extended.
- At 15°C (59°F): touch dry 60 minutes; hard dry 3 hours; minimum overcoat 16 hours; maximum extended.
- At 40°C (104°F): touch dry 15 minutes; hard dry 1 hour; minimum overcoat 6 hours; maximum extended.
Application data
- Method of application: air spray, brush, roller.
- Airless spray: not recommended.
- Air spray (pressure pot): recommended using DeVilbiss MBC or JGA gun, air cap 704 or 765, fluid tip E.
- Air spray (conventional): recommended with suitable proprietary equipment.
- Brush: suitable for small areas only; typically 15–20 microns (0.6–0.8 mils) DFT can be achieved.
- Roller: suitable for small areas only; typically 15–20 microns (0.6–0.8 mils) DFT can be achieved.
- Mixing: single component; must be mixed thoroughly with a power agitator before application.
- Thinner: International GTA007 (do not thin more than permitted by local environmental legislation).
- Cleaner: International GTA007.
Physical and regulatory properties
- Flash point (typical): 25°C (77°F).
- Product weight: 1.13 kg/litre (9.4 lb/gal).
- VOC (EPA Method 24): 4.13 lb/gal (495 g/litre) as supplied.
- VOC (EU Solvent Emissions Directive 2010/75/EU): 509 g/kg of product as supplied.
Temperature resistance and limitations
- Intertherm 50 Aluminium:
- For abrasive blast cleaned steel: continuous dry temperatures up to 540°C (1004°F).
- For hand-prepared substrates: maximum service temperature 400°C (752°F).
- Intertherm 50 Black:
- For abrasive blast cleaned steel: continuous dry temperatures up to 400°C (752°F).
- For hand-prepared substrates: maximum service temperature 300°C (572°F).
- Environments: not suitable for exposure in acid or alkaline environments.
System compatibility
- Suitable primers: Interzinc 22, Interzinc 2280.
- Suitable topcoat: Intertherm 50.
- This specialist coating is compatible with a very limited number of products.
Applications and use cases
Typical areas of use
- Flare stacks.
- Chimneys.
- Exhaust systems.
- Vents.
- Steel pipework operating at elevated temperatures up to 540°C (1004°F), depending on colour version and surface preparation.
Surface preparation
- All substrates must be clean, dry and free from contamination, assessed and treated in accordance with ISO 8504:2000.
- Oil and grease should be removed in accordance with SSPC-SP1 solvent cleaning.
- Abrasive blast cleaning: Sa2½ (ISO 8501-1:2007) or SSPC-SP6, with recommended surface profile 25–50 microns (1–2 mils).
- Hand or power tool preparation: minimum St3 (ISO 8501-1:2007) or SSPC-SP3; all scale must be removed and difficult areas spot-blasted to Sa2½ / SSPC-SP6.
- Primed steel: suitable over unweathered zinc silicate shop primers; degraded or heavily corroded primers require sweep blasting or complete abrasive blast cleaning.
- Aluminium metal spray: metal sprayed surfaces must be fresh, clean and free from moisture or contamination.
Use over zinc silicate primers
- When used in high heat service over inorganic zinc primer, film thickness specifications must be followed strictly; excessive film build may cause blistering.
- The zinc silicate primer must be thoroughly cured before applying the high heat coating.
- For maximum corrosion resistance, recommended zinc silicate DFT is 50 microns (2 mils) to ensure adequate surface strength and avoid topcoat flaking during temperature cycling.
- Overcoating of zinc silicate is preferable before weathering; if this is not possible, ensure the surface is clean and free of zinc corrosion products.
- In corrosive environments, direct application of Intertherm 50 Black over zinc silicate can lead to a colour change from black to grey due to salting of the primer; this can be reduced by first sealing with a single coat of Intertherm 50 Aluminium before applying Intertherm 50 Black.
FAQ
1. What is the maximum service temperature of INTERTHERM 50?
The aluminium version protects abrasive blast cleaned steel at continuous dry temperatures up to 540°C (1004°F), and hand-prepared substrates up to 400°C (752°F). The black version protects abrasive blast cleaned steel up to 400°C (752°F) and hand-prepared substrates up to 300°C (572°F).
2. Do I need a primer before applying INTERTHERM 50?
For maximum corrosion protection, application should be over a zinc silicate primer such as Interzinc 22 or Interzinc 2280. INTERTHERM 50 is suitable for application to unweathered steelwork freshly coated with zinc silicate shop primers.
3. How many coats can I apply without heat curing?
Up to 3 coats can be applied at 25 microns (1 mil) DFT per coat without the requirement for heating between coats, provided recommended application conditions are followed.
4. Which application methods are recommended?
INTERTHERM 50 can be applied by air spray (pressure pot or conventional), brush or roller. Airless spray is not recommended. Brush and roller are suitable for small areas only.
5. Can INTERTHERM 50 be used in acidic or alkaline environments?
No. The product is not suitable for exposure in acid or alkaline environments.
6. Why is the aluminium version preferred over the black version?
The aluminium version is recommended wherever possible due to its superior performance and higher maximum service temperature.
7. What is the typical drying time at 25°C?
At 25°C (77°F), the coating is typically touch dry in 30 minutes, hard dry in 2 hours, and can be overcoated after a minimum of 12 hours (maximum overcoating interval is extended).
8. What solvent and cleaner should be used?
International GTA007 is specified as both thinner (where allowed by local environmental legislation) and cleaner for all application equipment.
9. Can INTERTHERM 50 be applied over existing coatings?
Any coatings present on the surface must be removed before applying INTERTHERM 50. The surface should then be prepared in accordance with the specified standards.
10. How should surfaces be prepared before application?
Surfaces must be clean, dry and free from contamination, with oil and grease removed to SSPC-SP1. Steel should be prepared by abrasive blasting to Sa2½ / SSPC-SP6 or, where this is not possible, by hand or power tools to at least St3 / SSPC-SP3 with spot blasting as required.
Section 14 – Transport information
Pack and shipping details provided for INTERTHERM 50 are as follows:
- Pack sizes: 10 litre and 5 US gallon units.
- Pack volume (10 litre unit): 6 litres in a 10 litre pack.
- Pack volume (5 US gal unit): 5 US gal in a 5 US gal pack.
- Typical shipping weight: 8.2 kg for a 10 litre unit; 50.5 lb for a 5 US gallon unit.
- Storage during transport and warehousing: keep in dry, shaded conditions away from sources of heat and ignition.
Section 8 – Individual protection measures
INTERTHERM 50 is intended for use only by professional applicators in industrial situations. The following personal and workplace protection measures are indicated:
- Application and use must comply with all relevant national Health, Safety and Environmental standards and regulations.
- The product should not be used without reference to the Safety Data Sheet (SDS).
- When 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.
- All work areas should be ventilated sufficiently to control exposure to solvent vapours and fumes in accordance with applicable regulations.
*Contenido generado por IA
