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PPG SigmaTherm 540 is a one-component, heat-resistant, moisture-curing silicone aluminum coating for protecting steel surfaces in internal and external applications. Complies with NACE SP0198 for austenitic stainless steels and carbon steels under thermal insulation.
- Dry heat resistance up to 600°C (1112°F)
- No heat cure necessary between coats
- Excellent resistance against weathering
PPG SigmaTherm 540 is a one-component, heat-resistant, moisture-curing silicone aluminum coating for protecting steel surfaces in internal and external applications. Complies with NACE SP0198 for austenitic stainless steels and carbon steels under thermal insulation.
Principal Characteristics
- Dry heat resistance up to 600°C (1112°F)
- No heat cure necessary between coats
- Excellent resistance against weathering
- Also suitable on top of zinc silicate primer
- A minimum drying time of 3 days at 20°C (68°F) should be allowed before exposure to heat
Product Data
Two-component, high-build, heat-resistant epoxy phenol novolac coating.
Epoxy coatings will chalk and fade upon exposure to sunlight, elevated temperatures, or chemical exposure. Discolouration and normal chalking does not impact performance. Light colours will darken over time. Some batch-to-batch variation in colour is to be expected. Colour matches are approximate.
Data for mixed product at 20°C (68°F) | |
---|---|
Number of components | One |
Mass density | 1.1 kg/l (9.2 lb/US gal) |
Volume solids | 45 ± 2% |
VOC (Supplied) | Directive 1999/13/EC, SED: max. 412.0 g/kg |
UK PG 6/23(92) Appendix 3: max. 498.0 g/l (approx. 4.2 lb/US gal) | |
Temperature resistance (Continuous) | To 600°C (1110°F) |
Recommended dry film thickness | 25 µm (1.0 mils) |
Theoretical spreading rate | 18.0 m²/l for 25 µm (722 ft²/US gal for 1.0 mils) |
Dry to touch | 45 minutes |
Overcoating Interval | Minimum: 16 hours |
Shelf life | At least 9 months when stored cool and dry |
Notes:
- Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times
Surface Preparation
Recommended Substrate Conditions and Temperatures
- Steel; blast cleaned to ISO Sa 2½ or SSPC-SP-10, blasting profile 25 – 50 µm (1.0 – 2.0 mils)
- Suitable coating (zinc silicate primer) must be dry, free from any contamination and zinc salts
- Stainless steel; degreased and sweep blast (SSPC SP-16) cleaned to roughness of 40 – 70 µm (1.5 – 2.8 mils) with nonferrous abrasive
Note:
- The maximum continuous dry heat temperature when power tool treated surface (ISO-St3) is 400°C
Substrate Temperature & Application Conditions
- Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
System Specification
Suitable Primers :
- PPG Ethyl Silicate Zinc Primers
Do not use HI-TEMP 1027 or 222G as primer.
Direct to stainless steel with suitable surface treatment.
Application
Instructions for Use
- Power agitate to uniform consistency
- Application with airless equipment is possible, but be careful not to apply more than specified thickness
- When applying more than one coat, it is recommended that the total dry film thickness of SigmaTherm 540 does not exceed 80 µm (3.1 mils)
Air Spray
Recommended thinner
- No thinner should be added
Nozzle orifice
- 1.5 – 2.0 mm (approx. 0.060 – 0.079 in)
Nozzle pressure
- 0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)
Brush/roller
- For Roller application the best results will be obtained by using fine foam type rollers
Cleaning Solvent
Spreading Rate and Film Thickness
Overcoating interval for DFT up to 25 µm (1.0 mils)
Overcoating with... | Interval | 10°C (50°F) | 20°C (68°F) | 30°C (86°F) | 40°C (104°F) |
---|---|---|---|---|---|
Itself | Minimum | 24 hours | 16 hours | 12 hours | 6 hours |
Maximum | Unlimited | Unlimited | Unlimited | Unlimited |
Notes:
- Surface should be dry and free from any contamination
Curing time for DFT up to 25 µm (1.0 mils)
Substrate temperature | Dry to Touch | Dry to Handle |
---|---|---|
10°C (50°F) | 1 hour | 5 hours |
20°C (68°F) | 45 minutes | 3.5 hours |
30°C (86°F) | 30 minutes | 2 hours |
40°C (104°F) | 15 minutes | 1 hour |
Notes:
- Adequate ventilation must be maintained during application and curing (please refer to information sheets information sheet 1433 and
- Directives for Ventilation Practice (information sheet 1434)
Safety Precautions
- For paint and recommended thinners, see information sheets information sheet 1430, information sheet 1431 and the relevant Material Safety Data Sheets in the attachments section above
- This is a solvent-borne paint and care should be taken to avoid inhalation of spray mist or vapor, as well as contact between the wet paint and exposed skin or eyes
References
- Conversion Tables (information sheet 1410)
- Explanation to product data sheets (information sheet 1411)
- Safety Indicators (information sheet 1430)
- Safety in Confined Space and Health Safety, Explosion Hazard - Toxic Hazard (information sheet 1431)
- Cleaning of Steel and Removal of Rust (information sheet 1490)
- Specification for Mineral Abrasives (information sheet 1491)
- Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)
Data sheet
- Manufacturer
- PPG
- Water / Solvent Based
- Solvent
- For Use On
- Carbon steel, stainless steel
- Application Method
- Spray, brush, roller
- Sheen
- Eggshell
- Colour
- Standard / Ready Mixed
- Single, Two or Three Pack
- Single
- Product Certifications
- NACE SP0198
- Pack Size
- 5L, 20L
- Base Type
- Silicone aluminum
- Mixing Ratio
- -
- Key Features
- Dry heat resistance up to 600°C (1112°F), no heat cure necessary between coats, also suitable on top of zinc silicate primer
- Touch Dry (at 20°C)
- 45 minutes
- Dry to Handle (at 20°C)
- -
- Dry to Recoat (at 20°C)
- Min. 16 hours
- Fully Cured (at 20°C)
- -
- Pot Life (at 20°C)
- -
- Coverage
- 18.0 m²/I for 25 µm (722 ft²/US gal for 1.0 mils)
- Recommended Thinner/Cleaner
- For cleaning only: PPG Thinner 21-06
- Unit Contents
- -
- Compatible Primers
- -
- Compatible Topcoats
- Itself
- Max. Application Temperature
- -
- Min. Application Temperature
- At least 3°C (5°F) above dew point
- Density
- 1.1 kg/I (9.2 lb/US gal)
- Solids by Volume
- 45 ±2%
- Heat Resistance (up-to)
- 600°C
- VOC
- Directive 1999/13/EC, SED: max. 412.0 g/kg. UK PG 6/23(92) Appendix 3: max. 498 .0 g/1 (approx. 4.2 lb/US gal)
- Shelf Life (Once Opened)
- At least 9 months when stored cool and dry
- UN Number
- UN1263
- Base Type
- Solvent-Based
- Suitable For Use On
- Stainless Steel
- Suitable For Use On
- Carbon Steel
- Finish
- Eggshell
- Application Method
- Brush
- Application Method
- Roller
- Application Method
- Spray
- Product Usage Type
- Topcoat
- Product Range
- SigmaTherm
- Colour Family
- Aluminium
- Heat Resistance
- Up To 600°C
Questions
Question about the product
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IMPORTANT SHIPPING & DELIVERY INFORMATION
PPG SigmaTherm 540 is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
PPG Thinner 21-06
This thinner has been developed by PPG Protective and Marine Coatings for use with selected paint products.
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