PPG HI-TEMP 500 VHA Heat-resistant Coating 500 VHA

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Introduction

A single-component silicone-modified acrylic topcoat, mainly used as the subsequent topcoat for the primer - high-temperature paint 1027, to form a high-temperature protective coating system that can be applied directly on hot surfaces.

Key properties

• A silicone-modified acrylic high-temperature paint developed by incorporating organic resin with new technology, carefully selected acrylic resin with excellent thermal stability and heat-resistant inorganic pigments.
• The black and aluminium versions have ultra-strong thermal stability, with heat resistance up to 426 °C (800 °F) - other colours up to 260 °C (500 °F).
• Can be applied directly on hot surfaces, suitable application temperature range 66 °C to 204 °C (150 °F to 400 °F).
• Excellent application properties; on hot surfaces, it is not prone to wrinkling or cracking.
• 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 kept in stock, or colours may be customised to customer requirements, including silver (aluminium).
• Semi-gloss

Basic data at 20 °C (68 °F)

Product parameters

Aluminium: 33 ± 2%

Aluminium: 6.6 m²/L at 50 µm (265 ft²/US gal at 2.0 mils)

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 coating systems focused on ensuring corrosion protection performance and efficacy, a confirmed compatible anti-corrosive primer is required. High-temperature paint 1027 is recommended here; it can be applied directly

on hot surfaces, but must be applied according to the requirements of its product data sheet (PDS). If site problems arise or a suitable primer needs to be determined, PPG's field technical service representative can be consulted. After the completed primer coat has dried for the necessary time (minimum overcoating interval), apply one topcoat - high-temperature paint 500 VHA, at a dry film thickness of 50 to 63 µm (2.0 to 2.5 mils).

• For decorative coating systems emphasising appearance, a confirmed compatible anti-corrosive primer is recommended but not essential. Abrasive blast clean to the American Society for Protective Coatings

standard SSPC-SP6 "commercial blast cleaning" (i.e. Sa 2 per ISO 8501-1), roughness 25 to 38 µm (1.0 to 1.5 mils);

or use high-pressure water jet cleaning to a surface treatment equivalent to SSPC-SP6 "commercial blast cleaning" (i.e. Sa 2 per ISO 8501-1). Before coating, ensure the surface is clean and dry, with weld spatter, soluble salts, oil and grease, dust and other contaminants removed. Then apply 2 coats of the topcoat - high-temperature paint 500 VHA, each coat at a dry film thickness of 50 to 63 µm (2.0 to 2.5 mils), with a total dry film thickness of 100 to 125 µm (4.0 to 5.0 mils).

The existing coating is in good condition

• For old coatings in intact film condition, as long as there are no signs of coating defects such as cracks, crazing and/or peeling, only simple high-pressure water washing is needed to remove

surface soluble salts, oil and grease and other contaminants, then apply 1 coat of the topcoat - high-temperature paint 500 VHA, at a dry film thickness of 50 to 63 µm (2.0 to 2.5 mils).

Existing coating in poor condition with localised rust

• For old coatings showing signs of defects such as cracks, crazing, peeling and/or rust, the same surface treatment as for newbuild bare steel is required before coating.

If the coating surface shows no cracks, crazing or peeling - only local sporadic rusting (the defective area affected by rust is less than 10% of the coated area) - first high-pressure water wash the entire surface to remove soluble salts, oil and grease and other contaminants. After the surface dries, carry out the corresponding surface treatment, then on the bare steel areas where the primer has been removed, apply 1 coat of high-temperature primer 1027 according to the PDS. After the primer has dried for the necessary time (minimum overcoating interval), apply the topcoat - high-temperature paint 500 VHA as a full coat, with a dry film thickness of 50 to 63 µm (2.0 to 2.5 mils).

Note: before applying high-temperature paint 500 VHA over other coatings, a small patch of coating should be selected on site for an overcoating test to determine whether the intercoat adhesion meets requirements.

Substrate Temperature

• Application on hot surfaces: temperature above 66 °C (151 °F) and below 204 °C (400 °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 500 VHA: 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

• Suitable temperature range for direct application on hot surfaces: 66 °C (150 °F) to 204 °C (400 °F)
• When applying high-temperature paint 500 VHA on hot surfaces, keep the film thin each time; this helps promote solvent evaporation and reduce pinholes caused by solvent retention. This

application method is similar to thin-film mist spraying for sealing a porous 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,

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

Dry film thickness and theoretical spreading rate correspondence table - black and other colours

Spreading rate vs film thickness table — aluminium

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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