PPG HI-TEMP 1027 Heat-resistant Primer 1027

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Introduction

One-component high-build inert polymer heat-resistant coating/inorganic ceramic coating.

Key properties

• A coating designed as a corrosion protection solution for carbon steel and stainless steel under thermal insulation.
• Prevents stress corrosion cracking of austenitic stainless steel and duplex stainless steel.
• Resistant to thermal shock, dry/wet and hot/cold alternating cycles, intermittent immersion and boiling water.
• Resistant to continuous high temperatures up to 650°C (1200°F), with intermittent peak temperatures of 760°C (1400°F).
• Resistant to thermal cycling from -196 °C (-320 °F) to 540 °C (1000 °F).
• Accepts minimal surface preparation; the coating is resistant to UV radiation.
• May also be used as a primer for various colours of PPG HI-TEMP series heat-resistant topcoats.
• Complies with NACE SP0198 and is suitable for corrosion protection of austenitic stainless steel and carbon steel substrates under thermal insulation.

Colour and gloss

• Black, grey and light grey.
• Flat

Notes

• Differences in factory batch numbers, service environment, or exposure time may cause shade variations in the coating appearance; such variations do not impair corrosion protection performance.
• To achieve the desired result, select black or grey for the first primer coat.

Basic data 20 °C (68 °F)

Parameters after mixing

Maximum 420.0 g/L (approx. 3.5 lb/gal) (theoretical calculated value).

390.0 g/L (3.3 lb/gal) (US standard EPA Method 24).

2.9 m²/L for 250 µm (115 ft²/US gal for 10.0 mil).

Notes

• VOC value (EPA Method 24): dimethyl carbonate (DMC) is exempt and not counted.
• See the supplementary data sheet — theoretical spreading rate versus dry film thickness table.
• See supplementary parameters — recoat interval table.
• See supplementary parameters table — curing time table.

Recommended substrate condition and temperature

Carbon steel substrates under thermal insulation and exposed carbon steel without insulation

• All oil, grease, dust and other contaminants must be removed, especially soluble salts.
• Grind welds smooth, round off edges and remove weld spatter.
• Dry abrasive blast cleaning to SSPC-SP6, 'commercial blast' (or Sa2 of ISO 8501-1), achieving a surface profile of 25–50 µm (1.0–2.0 mil) is recommended.
• Alternatives to blast cleaning include: ISO St2 (SSPC SP2), ISO St3 (SSPC SP3), SSPC SP15 or SSPC SP WJ-2 or WJ-3, surface dry
• For coatings used in cryogenic environments or applied over inorganic zinc silicate primer, refer to the dedicated application guide for Heat-resistant Primer 1027.
• For application to substrates at temperatures above 150°C (300°F), consult a PPG field technical service representative.

Stainless steel substrates under thermal insulation and exposed stainless steel without insulation

• Austenitic stainless steel grades suitable for PPG HI-TEMP 1027 are 304, 316, and 410. For other stainless steel substrate grades, consult a PPG technical support specialist.
• All oil, grease, dust and other contaminants must be removed, especially soluble salts.
• Grind welds smooth, round off edges and remove weld spatter.
• Light blasting or other abrading of the surface in accordance with SSPC SP16, to ensure a uniform and dense surface profile of at least 25 µm (1.0 mil).
• Under thermal cycling conditions, surface temperature shall not exceed 540°C (1000°F).

Substrate temperature and application conditions

• During application, substrate temperature shall be maintained between 10°C (50°F) and 316°C (600°F).
• During application, the substrate temperature must be maintained at least 3 °C (5 °F) above the dew point.
• During application, the relative humidity shall not exceed 75%, and adequate ventilation is required
• Application to hot substrate surfaces: temperature shall be above 50°C (122°F) and below 316°C (600°F).

Notes

• For direct application of this product to hot surfaces at 200°C (392°F) to 316°C (600°F), consult a PPG field technical service representative in advance.
• If ambient temperature falls below 10°C (50°F) during coating drying and curing, the specified drying time shall be extended accordingly.

When applying the topcoat, initial high-temperature exposure is required

• When applied as a topcoat, to prevent solvent retention causing blistering, the substrate temperature must be raised slowly at 1 to 2 °C per minute to 177–204 °C (350–400 °F) over 2 hours. Alternatively, the initial temperature rise may be made in 25 °C increments, holding at each temperature for 20–30 minutes.

Notes

• Before topcoat application, heating HI-TEMP 1027 to 177°C (350°F) in a single cycle and holding for 2 h may also serve as an alternative to the above heating procedure.

Coating system specification

Service environments with and without thermal insulation: applied directly to ambient-temperature or hot carbon steel surfaces.

• Option 1: Thermal insulation environment.
• Heat-resistant Primer HI-TEMP 1027: multiple successive spray passes to achieve a DFT of at least 250 µm (10.0 mil) per coat. Refer to the supplementary details in the application guide.
• Option 2: Thermal insulation environment (two-coat system).
• Two coats of PPG HI-TEMP 1027 with a total DFT of 250–300 µm (10–12 mil)
• Option 3 is for highly corrosive conditions (C4–C5) and marine transport.
• Inorganic zinc silicate primer DIMETCOTE 9: dry film thickness 50–75 µm (2.0–3.0 mil).
• Heat-resistant Primer HI-TEMP 1027: DFT of 250–300 µm (10.0–12.0 mil).

Notes

• Substrates coated with inorganic zinc silicate primer Dimetcote 9 shall not be coated directly while hot.
• A system using PPG DIMETCOTE 9 as primer can withstand service temperatures up to 650°C (1200°F), provided the DFT of PPG DIMETCOTE 9 is between 50 and 65 µm (2.0 and 2.5 mil).
• For surfaces without thermal insulation, use a compatible PPG HI-TEMP 500 or PPG HI-TEMP 1000 according to the maximum temperature requirement. For direct application to hot surfaces, consult the PPG field technical service representative.

Environments with and without thermal insulation: may be applied directly to ambient-temperature or hot stainless steel substrates.

• Heat-resistant Primer HI-TEMP 1027: multiple successive spray passes may be applied continuously to achieve a DFT of 150–250 µm (6.0–10.0 mil) per coat.

Notes

• For surfaces without thermal insulation, use a compatible PPG HI-TEMP 500 or PPG HI-TEMP 1000 according to the maximum temperature requirement. For direct application to hot surfaces, consult the PPG field technical service representative.

Instructions for use

• HI-TEMP Series Heat-resistant Primer 1027 is a heavy-bodied coating; mix thoroughly with a power agitator until spraying begins, and maintain continuous agitation during application. Ensure settled powder components are dispersed by agitation and uniformly reincorporated into the bulk. If on-site thinning is required, use only the PPG-specified thinner and comply with relevant regulations and safety rules. Maintain agitation as required during application.
• When applying to hot surfaces, spray HI-TEMP Series Heat-resistant Primer 1027 in several passes, keeping the WFT as thin as possible in each pass. This application process is similar to thin mist coating to seal porous surfaces, preventing blistering and allowing solvent release. If blistering occurs, immediately correct with a paint brush while the wet film is still flowable.
• Airless spray is generally recommended; where this is not possible on site, brush or roller application may be attempted. For more information on brush and roller application, refer to the PPG application guide for HI-TEMP Series Heat-resistant Primer 1027.

Air spray

• Thinning not recommended.

Airless spray (single-feed pump)

• Thinning not recommended.

Notes

• Use the lowest possible spray pressure to avoid dry spraying.

Brush/roller

Notes

• In brush application, insufficient thixotropic development usually causes the wet film to dry before it levels fully, making a smooth dry-film appearance difficult to achieve; however, this does not affect coating performance quality.

Cleaning solvent

• Thinner 21-06 (AMERCOAT 65).
• Thinner 21-25 (AMERCOAT 101).

Supplementary parameters

Film thickness and theoretical spreading rate

Overcoating time for a 250 µm (10.0 mil) dry film thickness

1000.

Curing time for a 250 µm (10.0 mil) dry film thickness

Notes

• For the shortest drying time before applying thermal insulation, twice the hard-dry time is recommended, to ensure sufficient solvent release.
• Drying time generally varies with environmental and substrate conditions. Coating thickness shall not exceed the recommended maximum DFT; otherwise drying time will be affected.
• At normal service temperatures below 150°C (300°F), the coating film is generally tough and durable. If the substrate is heated and the surface temperature rises above 150°C (300°F), film hardness increases accordingly with temperature and ultimately stabilizes at 2H.

Safety Precautions

• After reviewing the MSDS, apply the coating in accordance with the familiarised requirements. Before contact with this product, read the MSDS carefully from a health and safety standpoint to fully grasp the relevant information. All handling, application and disposal of this product must comply with national and local laws and regulations on health, safety and environmental protection, including reference to and implementation of valuable practical experience and recognised standards for safe coating application, such as SSPC PA1, Shop, Field, and Maintenance Painting of Steel.

Worldwide applicability

Although PPG Protective & Marine Coatings is committed to providing completely consistent products to users worldwide, from time to time it may be necessary to make minor adjustments to specific products to comply with local/national regulations or environmental requirements. In the following cases, use the corresponding alternative version of the product data sheet instead.

Reference information

• Information sheet | Explanation of product data sheets
• Guide | PPG HI-TEMP 1027 | Application guidelines

Quality guarantee

PPG warrants (1) that it has good title to the product, (2) that the product quality conforms to the relevant technical quality specifications in force at the date of manufacture of the product, and (3) that the supplied product is free of lawful claims by third parties for infringement of US patent rights. The above warranties are limited to those given by PPG and other express or implied warranties required by applicable laws and regulations for transactions and commercial practice; any abuse contrary to the stated conditions, and any other warranty for special purposes or uses, are excluded, and PPG shall be free from liability. To claim under this warranty, the buyer must notify PPG in writing within five (5) days of discovering the quality defect, and the date must be within the product's valid storage period or within one (1) year from delivery of the product to the buyer. If the buyer fails to notify PPG of the defect as required above, this will prejudice the buyer's right to obtain compensation under this warranty from PPG!

Limitation of liability

In all cases, PPG shall not be liable for any indirect, special, incidental or consequential loss of any kind arising from or in connection with the use of this product (whether based on negligence, strict liability or tort). The information in this product data sheet is based on laboratory tests we believe to be reliable, and is provided for guidance only. PPG may revise this information at any time as experience accumulates and product development progresses. All recommendations and advice concerning the use of this product, whether in technical documents, in response to an enquiry or otherwise, are given to the best of our knowledge and are believed to be reliable. Our products and related information are provided for industrial users possessing the necessary knowledge and practical skills, and it is the end user's responsibility to determine whether the product is suitable for the specific use. The buyer, having performed such evaluation, proceeds entirely at its own risk. The quality and condition of the substrate on site, and the many other factors affecting product use and application, are beyond PPG's control. Therefore, PPG accepts no liability for any loss, injury or damage arising from the use of the information in this product data sheet (unless otherwise provided in a written agreement). Different application environments, changes to the application process or extrapolation of the reference data may result in failure to achieve the expected coating quality. This product data sheet supersedes all previous versions. The buyer is responsible for confirming that the data sheet in hand is the latest version before using the product. The latest version is published on the official website of PPG Protective & Marine Coatings: www.ppgpmc.com. In case of discrepancy between the Chinese version and the original English version of the product data sheet, the English original shall prevail.

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