PPG Hi-Temp 1027 is a one-component, high-build heat-resistant inert multipolymeric matrix/inorganic ceramic coating designed to prevent corrosion under insulation (CUI) of carbon steel and stainless steel. Prevents external stress corrosion cracking (ESCC) of austenitic and duplex stainless steel.

Top Features & Benefits

• Resistant to thermal shock/cycling and intermittent immersion and boiling water
• Continuous temperature resistance to 650°C (1200°F) and intermittent temperature resistance to 760°C (1400°F)
• Cyclic temperature resistance from -196°C (-320°F) to 540°C (1000°F)
• Can be applied direct to substrates at temperature ranging from 10°C (50°F) to 316°C (600°F)
• Surface tolerant and stable against UV
• May be used as primer for PPG HI-TEMP heat-resistant colour topcoats
• Complies with NACE SP0198 for austenitic stainless steels and carbon steels under thermal insulation
• Used in refurbishment of distillation columns at North Taranaki, the only manufacturer of methanol in New Zealand, producing up to 2.4 million tonnes of methanol per year.
• Used by BASF Antwerpen NV, the largest integrated chemical complex in Belgium and the second largest production platform of the BASF Group worldwide, with a range comprising base and speciality chemicals and primary products, refining products and inorganic chemicals. Used to protect the heat exchanger from temperatures up to 325°C (617°F) and provide sufficient corrosion protection in the ambient temperature range

Note: Minor colour differences may occur due to batch variation and from exposed service, but corrosion protection will not be compromised. For best results, use black or gray colour as first coat

Product Data

Recommended Substrate Conditions and Temperatures

Substrate conditions of carbon steel for insulated and non-insulated service

• Must be free of oil, dirt, grease and all other contaminants, especially salts
• Round off all rough welds and sharp edges. Remove weld spatter
• Recommended is dry abrasive blast cleaning to SSPC-SP 6, “Commercial Blast” (ISO-Sa 2) with a 25 to 50 µm (1.0 to 2.0 mils) profile
• Alternative methods to abrasive blast cleaning include : ISO-St2 (SSPC-SP-2), ISO-St3 (SSPC-SP-3), SSPC-SP-15 or SSPC-SP WJ-2 or WJ-3 with dry surface
• For application in cryogenic service and for application over inorganic zinc (IOZ), refer to the PPG HI-TEMP 1027

Application Guide

• For service not exceeding 150°C (300°F) please contact Rawlins Paints' Technical Support Team

Substrate conditions of stainless steel for insulated and non-insulated service

• Suitable austenitic stainless grades for PPG HI-TEMP 1027 are 304, 316 and 410. For other stainless steel grades, please contact Rawlins Paints' Technical Support Team

• Must be free of oil, dirt, grease and all other contaminants, especially salts
• Round off all rough welds and sharp edges. Remove weld spatter
• An anchor profile is not mandatory for adhesion of PPG HI-TEMP 1027 on stainless steel surfaces. If required, brush-off blast cleaning to SSPC-SP-2, SSPC-SP-3, or SSPC-SP-16 using a chloride-free abrasive may be used
• Temperature not to exceed 540°C (1000°F) under cyclic conditions

Substrate Temperature and Application Conditions

• Substrate temperature during application should be between 10°C (50°F) and 66°C (151°F)
• Application to hot substrate: should be above 66°C (151°F) and below 316°C (600°F)
• Substrate temperature during application should be at least 3°C (5°F) above dew point
• Relative humidity during application should not exceed 85%, and good ventilation is required

Notes: For application to substrates over 260°C (500°F) to 316°C (600°F), please contact Rawlins Paints' Technical Support Team. If the air temperature is expected to fall below 10°C (50°F) during drying, the dry time must be extended

System Specification

Insulated and non-insulated service: applied direct to ambient or hot carbon steel

• Option 1 for insulation service
• PPG HI-TEMP 1027: minimum 250 µm (10 mils) DFT continuous application using multiple spray passes. Refer to application guide for additional details
• Option 2 for insulation service (two coat system)
• PPG HI-TEMP 1027: 75 to 100 µm (3.0 to 4.0 mils) DFT
• PPG HI-TEMP 1027: 175 to 200 µm (7.0 to 8.0 mils) DFT
• Option 3 for high corrosive condition (C4-C5) without topcoat and when sea transportation is necessary
• PPG DIMETCOTE 9 : 50 to 75 µm (2.0 to 3.0 mils) DFT
• PPG HI-TEMP 1027: 200 to 250 µm (8.0 to 10.0 mils) DFT

Note: Hot application is not applicable to PPG DIMETCOTE 9

Insulated and non-insulated service: applied direct to ambient or hot stainless steel

• PPG HI-TEMP 1027: 150 to 250 µm (6.0 to 10.0 mils) DFT continuous application with multiple spray passes

Primer/topcoat system – non-insulated service: applied direct to ambient or hot carbon and stainless steel

• PPG HI-TEMP 1027: 175 to 200 µm (7.0 to 8.0 mils) DFT
• PPG HI-TEMP topcoats ambient apply: PPG HI-TEMP 500 VS or PPG HI-TEMP 1000 VS, hot apply: PPG HI-TEMP 500 VHA or PPG HI-TEMP 1000 VHA

Instructions for Use

• PPG HI-TEMP 1027 is a heavy bodied material; use mechanical agitation for mixing immediately before application and as needed during application. Be sure any settled solids are incorporated during mixing. If thinning is needed, thin only with PPG thinners and in accordance with applicable regulations. Agitate as needed during application.

• For application to hot substrate, apply multiple thin passes of PPG HI-TEMP 1027. This process, similar to mist coating, prevents blistering and also allows solvent to escape. If blisters are observed, immediately brush out the blisters before they set, using a wire brush

• Spray application is recommended, but when it is not possible, may be applied using roller or brush. For more specific instructions regarding roller and brush application, refer to the PPG HI-TEMP 1027 Application Guide

Air spray

• No thinner is recommended

Nozzle orifice: 1.8 – 2.2 mm (approx. 0.070 – 0.087 in)

Nozzle pressure: 0.4 - 0.6 MPa (approx. 4 - 6 bar; 58 - 87 p.s.i.)

Airless spray

• No thinner is recommended

Nozzle orifice: Approx. 0.48 mm (0.019 in)

Nozzle pressure: 12.0 - 16.0 MPa (approx. 120 - 160 bar; 1741 - 2321 p.s.i.)

Note: Use the lowest possible spraying pressure to avoid dry spraying

Brush/roller

Recommended thinner - application to ambient substrate below 66°C (150°F)

• THINNER 21-06 (AMERCOAT 65)
• THINNER 91-10 for VOC compliant only

Recommended thinner - application to hot substrate at 66°C (150°F) up to 260°C (500°F)

• THINNER 21-25 (AMERCOAT 101)
• Use of other thinners could produce a fire hazard

Volume of thinner: Up to 5% THINNER can be added if desired

Note: Due to thixotropic nature of the paint, it is difficult to obtain a smooth film by brush, although this does not affect performance.

Cleaning Solvent

• THINNER 21-06 (AMERCOAT 65)
• THINNER 21-25 (AMERCOAT 101)
• THINNER 91-10 for VOC compliant only