PPG HI-TEMP 1000 VHA Heat-resistant Coating 1000 VHA

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Introduction

One-component modified silicone heat-resistant topcoat, mainly used as the subsequent matching topcoat for Heat-resistant Coating 1027 in coating systems applied directly to hot substrate surfaces.

Key properties

• A heat-resistant topcoat formulated from advanced silicone resin, withstanding severe thermal cycling up to 650 °C (1200 °F).
• The black and green versions show excellent colour stability up to 650 °C (1200 °F) – other versions up to 538 °C (1000 °F)
• The temperature range for direct application on hot substrate surfaces is 149 °C (300 °F) to 260 °C (500 °F)
• Excellent application performance in many aspects
• Excellent brushing and rolling properties; application generally feels smooth and convenient.
• With a suitable primer, the coating system has high weathering and anticorrosive performance.
• The coating is resistant to softening even under severe thermal cycling

Colour and gloss

• Standard colours available, and various colours can be customised to customer requirements
• Flat

Basic data at 20 °C (68 °F)

Product parameters

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

colour stability of the customer-colour versions

Notes

• See the supplementary data sheet — theoretical spreading rate versus dry film thickness table
• See supplementary parameters table — curing time table

Recommended substrate condition and temperature

New construction or corroded substrate surfaces

• For heat-resistant coating systems emphasising corrosion protection performance and efficacy, a heat-resistant primer with excellent anti-corrosion performance is required. Heat-resistant Coating 1027 is recommended as the

matching primer; it can be applied directly to hot surfaces, but must be applied per its product data sheet (PDS). For on-site questions, consult the PPG field technical service representative at any time. After the primer is completed, a necessary drying period is required; once the minimum recoat interval is reached, the topcoat – Heat-resistant Coating 1000 VHA – may be applied at a dry film thickness of 50 to 63 µm (2.0 to 2.5 mil).

• For decorative coating systems emphasising appearance, a matching anticorrosive primer is recommended but not essential. Abrasive blasting is required to the American coating corrosion

Society standard SSPC SP 6 "commercial blast cleaning" (equivalent to Sa 2 of the international standard ISO 8501-1), with surface roughness 25 to 38 µm (1.0 to 1.5 mil); or high-pressure water jetting achieving the same surface treatment effect may be used. Before coating, ensure the surface is clean and dry, with all soluble salts, weld spatter, oil, grease and other contaminants removed. Then apply 2 coats of Heat-resistant Coating 1000 VHA, each at 50 to 63 µm (2.0 to 2.5 mil) dry film, with a total thickness of 100 to 125 µm (4.0 to 5.0 mil).

The existing coating is in good condition

• If the existing old coating is intact, without cracking, damage and/or peeling defects, the surface may be cleaned with high-pressure water to remove all soluble salts, oil, grease and other

contaminants, then one coat of Heat-resistant Coating 1000 VHA topcoat may be applied at a dry film thickness of 50–63 µm (2.0–2.5 mil).

Existing coating in poor condition with localised rust

• If the existing old coating shows widespread cracking, damage, peeling and/or rusting defects, the substrate must be surface-prepared per the surface treatment techniques and quality requirements of new projects.

If the existing old coating shows no obvious signs of cracking, damage, peeling and/or rusting defects, but only scattered small-area rust spots (the defect area affected by rusting not exceeding 10% of the total coating area), then only high-pressure water whole-surface cleaning is required to remove salts, oil, grease and other contaminants; after the surface dries, carry out the corresponding surface treatment, then per the product data sheet requirements, apply Heat-resistant Coating 1027 to the bare steel areas where the old coating was removed. After the primer in the repaired areas is hard dry, the topcoat – Heat-resistant Coating 1000 VHA – may be formally applied at a dry film thickness of 50–63 µm (2.0–2.5 mil).

Note: before overcoating Heat-resistant Coating 1000 VHA over other types of coatings, select a small area of old coating on site and carry out a small-area overcoating test to determine whether intercoat adhesion meets the requirement.

Substrate Temperature

• Application on hot surfaces: the temperature shall be above 149 °C (300 °F) and below 260 °C (500 °F)

Coating system specification

Bare steel without external thermal insulation

• Heat-Resistant Coating 1027: dry film thickness 125 to 150 µm (5.0 to 6.0 mil)
• Heat-resistant Coating 1000 VHA: dry film thickness 50 to 63 µm (2.0 to 2.5 mil)

Note: do not exceed the dry film thickness recommended above

Instructions for use

• Use a power mixer. Stir thoroughly to a homogeneous state.
• Thinning is generally not required. If thinning is necessary on site, use only the dedicated PPG thinner and comply with the regulations in force.

Brief instructions for application on hot surfaces

• Substrate surface temperature 149 °C (300 °F) to 260 °C (500 °F)
• When applying Heat-resistant Coating 1000 VHA on hot surfaces, apply each pass as thinly as possible so the solvent evaporates quickly; otherwise retained solvent

causes pinholes in the coating. This application method is similar to the thin mist spray used to apply sealers/tie coats over porous surfaces.

• 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,

not a synthetic-fibre brush), brushing the depressed areas left by burst bubbles smooth while the wet film is still levelling.

• Dry spray is also common when coating hot surfaces. Control and adjust the spraying distance and angle at all times to avoid dry spray where possible.

Note: unless using the PPG dedicated thinners recommended below, no other thinner shall be used. Using a non-dedicated thinner poses a potential fire hazard. In addition, defects such as dry spray and poor film formation may occur.

Air spray

Recommended dedicated thinner

• Thinner 21-25 or HI-TEMP Thinner 5

Airless spray (single-feed pump)

• Thinner 21-25 or HI-TEMP Thinner 5

Brush/roller

Recommended thinner

• No thinner required
• Thinner 21-25 or HI-TEMP Thinner 5

Thinner quantity

If necessary, up to 5% by volume of thinner may be added

Note: spray application is the preferred method; only when spraying is not possible on site may brush and roller be considered. Use a high-quality brush or short-nap roller for manual application. When brushing or rolling, apply even pressure in one direction, which also helps achieve the required film thickness.

Cleaning solvent

• Thinner 21-25 or HI-TEMP Thinner 5

Supplementary parameters

Film thickness and spreading rate

Curing schedule for a 63 µm (2.5 mil) dry film thickness

Safety Precautions

• This product is for use only by qualified personnel with sufficient expertise and relevant application experience, after carefully reading the Product Data Sheet (PDS) and Material Safety Data Sheet

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

Although PPG Protective and 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

• For the conversion table, refer to Information Sheet 1410
• For product data, refer to Information Sheet 1411

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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