PPG SigmaTherm 230 is a two-component, high-build, heat-resistant epoxy phenol novolac coating that provides a corrosion resistant barrier on carbon steel and stainless steel under thermal insulation. Suitable as heat resistant system under insulation up to 230°C (450°F) as well as for use in cryogenic conditions.

Features & Benefits

• Excellent protection and resistance against corrosion and severe chemicals
• Excellent resistance to thermal shock during rapid wet & dry cycling
• Meets CS-1, 3 and 4 for carbon steels under thermal insulation according to NACE SP0198-10
• Meets SS-1, 2 and 3 for stainless steels under thermal insulation according to NACE SP0198-10
• No post-curing is required to obtain mechanical strength
• Can be applied on hot substrate up to 150°C (302°F); please contact our technical team for details

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.

Notes:

• Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times
• To avoid crack in elevated temperature, it is recommended that the total average dry film thickness not exceed 350 µm (14 mils) and locally 400 µm (16 mils)

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Steel - blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
• The substrate must be perfectly dry before and during application of SigmaTherm 230
• Stainless steel; degrease with solvent and sweep blast, SSPC SP-16 with blasting profile 40 – 100 µm (1.5 – 4.0 mils)

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be above 5°C (41°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

Application

Instructions for Use

Mixing ratio by volume: base to hardener 87:13

• The temperature of the mixed base and hardener should preferably be above 15°C (59°F), otherwise extra thinner may be required to obtain application viscosity
• Adding too much thinner results in reduced sag resistance
• Thinner should be added after mixing the components

Induction Time

Allow induction time before use

Air Spray

Recommended thinner

• PPG Thinner 91-92 for ambient temperature; PPG Thinner 21-25 for application to hot surfaces

Volume of thinner

• 5 - 10%, depending on required thickness and application conditions

Nozzle orifice

• 2.0 mm (approx. 0.079 in)

Nozzle pressure

• 0.3 MPa (approx. 3 Bar; 44 p.s.i.)

Airless Spray

Recommended thinner

• PPG Thinner 91-92 for ambient temperature; PPG Thinner 21-25 for application to hot surfaces

Volume of thinner

• 5 - 10%, depending on required thickness and application conditions

Nozzle orifice

• Approx. 0.46 – 0.53 mm (0.018 – 0.021 in)

Nozzle pressure

• 15.0 MPa (approx. 150 bar; 2176 p.s.i.)

Brush/roller

Recommended thinner

• PPG Thinner 91-92

Volume of thinner

• 0 – 5%

Cleaning Solvent

• Thinner 90-53

Spreading Rate and Film Thickness

Overcoating interval for DFT up to 150 µm (6.0 mils)

Notes:

• Surface should be dry and free from any contamination

Curing time for DFT up to 150 μm (6.0 mils)

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)

Pot Life (at application viscosity)

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 vapour, 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)
• Safe Working in Confined Spaces (information sheet 1433)
• Directives for Ventilation Practice (information sheet 1434)
• 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)