PPG HI-TEMP 1000 One-component General-purpose Silicone Heat-resistant Topcoat

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Introduction

One-component general-purpose silicone heat-resistant topcoat. Replaces HI-TEMP heat-resistant coating 1000 V / VS / VHA for heat-resistant coating protection systems.

Key properties

• Heat-resistant topcoat based on specialty silicone resin; withstands severe thermal cycling at temperatures up to 540°C (1000°F).
• Fast self-drying.
• Wide substrate surface temperature range for application – 10–260°C (50–500°F).
• Excellent application performance in many respects.
• Excellent brushing and rolling properties; application generally feels smooth and convenient.
• With a suitable primer, the coating system provides both excellent weather resistance and corrosion protection.
• Provided the coating has been exposed to 177°C (350°F) for 2 h or more, it does not soften even under severe thermal cycling.

Colour and gloss

• Standard colours kept in stock, or colours may be customised to customer requirements, including silver (aluminium).
• Flat

Notes

• Some fading may occur below 540°C (1000°F).

Basic data 20 °C (68 °F)

Parameters after mixing

Notes

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

Recommended substrate condition and temperature

New construction or corroded substrate surfaces

• Where the service environment imposes high corrosion protection requirements on the coating system, a suitable anticorrosive primer is necessary. Carry out surface preparation and apply HI-TEMP heat-resistant primer 1027 or inorganic zinc primer (IOZ) in accordance with the relevant requirements of the product Data Sheet. For suitable primers, consult PPG technical support specialists; after confirmation, strictly follow the technical requirements of the product Data Sheet. Before applying the heat-resistant topcoat, ensure the previous primer has sufficient drying time. The topcoat generally requires only one coat of HI-TEMP heat-resistant coating 1000 at 25–50 µm (1.0–2.0 mil) dry film thickness.
• Where only decorative appearance is required for the coating system, a suitable anticorrosive primer is recommended but not mandatory. Abrasive blast cleaning to SSPC standard SP6 "Commercial Blast Cleaning" (ISO-8501-1 Sa2) with a surface roughness of 25–38 µm (1.0–1.5 mil), or high-pressure water jetting to SSPC-VIS-4 WJ2L, is acceptable. Before application, remove weld spatter, soluble salts, dust, oil and grease, and other contaminants from the surface. Grind welds and sharp edges smooth and fair. Finally, apply 2 coats of HI-TEMP heat-resistant coating 1000, each at 38–50 µm (1.5–2.0 mil) dry film thickness, to a total dry film thickness of 75–100 µm (3.0–4.0 mil).

The existing coating is in good condition

• If the existing coating is intact and the surface is free from chalking, cracking and/or contamination, simply remove soluble salts, oil and grease, and other contaminants by suitable methods, then apply one coat of HI-TEMP heat-resistant coating 1000 at 25–50 µm (1.0–2.0 mil) dry film thickness.

Existing coating in poor condition with localised rust

• If the existing old coating shows chalking, cracking, lifting/peeling and/or rusting, follow the complete coating process for a new project, starting from surface preparation. If the coating shows no chalking, cracking or lifting/peeling and only local coating damage with rust recurrence (rusted area less than 10% of the painted area), first remove oil and grease (if present), then wash the surface with fresh water to remove soluble salts and residual contaminants, carry out appropriate surface preparation in accordance with the specified technical requirements of the product Data Sheet, and apply HI-TEMP heat-resistant primer 1027 to the exposed substrate. After the HI-TEMP heat-resistant primer 1027 coating is complete and dry, apply one full coat of HI-TEMP heat-resistant coating 1000 at 25–50 µm (1.0–2.0 mil) dry film thickness.

Notes

• Where HI-TEMP heat-resistant coating 1000 is to be applied over other coatings, apply a small test patch before full coating to determine whether intercoat adhesion meets requirements or any adverse reaction occurs.

Substrate Temperature

• During application, substrate temperature should be maintained between 10°C (50°F) and 260°C (500°F).
• During application, the substrate temperature must be maintained at least 3 °C (5 °F) above the dew point.
• Application on hot substrate surfaces: temperature should be above 50°C (122°F) and below 260°C (500°F).

When used as a topcoat with HI-TEMP 1027 or HI-TEMP 1027 HD, where 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 or HI-TEMP 1027 HD once to 177°C (350°F) and holding for 2 h is also an alternative to the above heating procedure.

Coating system specification

Uninsulated carbon steel and stainless steel – Option 1

• PPG HI-TEMP 1027 or HI-TEMP 1027 HD: 250–300 µm (10–12 mil)
• HI-TEMP Heat-Resistant Coating 1000: dry film thickness 25–50 µm (1.0–2.0 mil).

Uninsulated carbon steel and stainless steel – Option 2

• Inorganic zinc primer (IOZ) or other compatible primers (see the product data sheet for the dry film thickness specification).
• HI-TEMP Heat-Resistant Coating 1000: dry film thickness 25–50 µm (1.0–2.0 mil).

Instructions for use

• Use a power mixer. Stir thoroughly to a homogeneous state.
• Except for direct application on hot surfaces, no thinner is generally required. Where thinner is necessary, use only PPG-recommended thinner and follow the relevant safety regulations.

Brief instructions for application on hot surfaces

• For direct application on hot substrate surfaces at 93–260°C (200–500°F), follow the procedure below.
• Dilute HI-TEMP heat-resistant coating 1000 with a suitable thinner at 5% by volume and spray in multiple passes with a thin film per pass. This helps solvent in the film evaporate promptly and smoothly, reducing pinholes. The procedure is similar to mist coating a thin sealer over a porous coating surface.
• On hot surfaces, do not apply too thick a film in one pass, otherwise the coating is prone to blistering. If blistering occurs, immediately repair with a brush (only a natural-bristle brush with a wooden handle may be used, not a synthetic-fibre brush), brushing the depressed areas left by burst bubbles smooth while the wet film is still levelling.
• Direct application on hot surfaces tends to cause dry spray. To avoid dry spray, control the spray distance properly.

Notes

• Do not use thinners other than those recommended above. Improper thinner selection may cause fire. Dry spray and poor film formation may occur.

Air spray

Airless spray (single-feed pump)

Brush/roller

Notes

• Spray application is recommended; where spraying is not possible on site, brush or roller may be used instead, provided a suitable brush is chosen and a short-nap roller is used.

Cleaning solvent

• Thinner 21-06 (AMERCOAT 65).

Supplementary parameters

Film thickness and theoretical spreading rate

Curing time for a coating at 50 µm (2.0 mils) dry film thickness

Notes

• Where equipment coated with HI-TEMP heat-resistant coating 1000 is to be shipped or subjected to subsequent operations, handle it with care and take protective measures to prevent coating damage from contact and abrasion.

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

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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