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PPG PSX Polysiloxane Coatings Beautifully Corrosion Resistant

Image courtesy of PPG PMC

When polysiloxane coatings were introduced 25 years ago, they set a standard for performance that remains unsurpassed today. With their exceptional color/gloss retention and superior resistance to corrosion, ultraviolet (UV) light, abrasion, and chemicals, polysiloxane coatings became the industry choice for protection of storage tanks, smokestacks, oil platforms, bridges, and other infrastructure applications, as well as for amusement parks, stadiums, cargo ships, aircraft carriers, and other marine vessels.

As one of the world’s leading coatings companies, PPG has played a major role in advancing the technical development of these products. The PPG PSX® family of polysiloxane coatings offers three distinct products to meet the color and corrosion-fighting demands of asset owners, architects, engineers, and maintenance personnel around the world.

The Chemistry of Success

The secret to the performance of polysiloxane coatings can be found in their chemistry — a string of powerful silicone-oxygen bonds. When polysiloxane polymers are created, each silicone atom is bonded to two or three oxygen atoms, causing the silicone to be 50 to 75% oxidized when the coating is formulated.

Because this oxidation is “built into” their formulation, polysiloxane coatings are inherently less vulnerable to environmental hazards than epoxy- and acrylic-urethane coatings, which are based on much weaker carbon-carbon bonds. The chemistry of polysiloxane coatings yields health and environmental benefits, too, including the absence of isocyanates and low-volatile organic compound (VOC) content.

PPG PSX Coatings

Looks and Performance for Every Surface

PPG is a pioneer in polysiloxane coatings. In addition to introducing the first products based on this technology in 1994, PPG owns 16 patents for their continued development. This expertise has enabled PPG to develop a full range of polysiloxane coatings for protective and marine applications, encompassing the following product lines:

PPG PSX 700 and PPG PSX 700SG (Semi-Gloss) Coatings

Designed for long-term protection of steel substrates, PPG PSX 700 and PPG PSX 700SG coatings are epoxy-based polysiloxanes with decades of proven performance in harsh environments.

Due to their robust formulation and excellent adhesion, PPG PSX 700 coatings achieve performance that equals or surpasses traditional three-coat epoxy- and acrylic-urethane coatings, which require the application of a mid-coat epoxy layer.

For asset owners, that means top-of-the-line corrosion performance, color retention, and gloss retention with less product, waste, and investment in materials, scaffolding, labor, and other expenses. When used for maintenance applications, PPG PSX 700 and PPG PSX 700SG coatings also can help return assets to service more quickly than those requiring three coating layers.


PPG PSX ONE coating offers the performance and and environmental advantages of polysiloxane coatings with a dose of application ease. As a single-component, acrylic-based formulation, PPG PSX ONE coating is pre-mixed and shipped in cans, eliminating the mixing concerns associated with two-component coatings that require precise blending on the jobsite.

For touch-up and maintenance applications, PPG can custom-match PPG PSX ONE coating to any PPG PSX 700 coatings color. Maintenance projects also are made easier by its unlimited recoatability and ease-of-storage. PPG PSX ONE coating offers excellent pot life, as cans may be re-opened and reused multiple times, as long as container lids are properly resealed after each use.

PPG PSX 805 Coating

Introduced in 2017, PPG PSX 805 coating is the latest breakthrough in PPG polysiloxane technology. This formulation features greater flexibility than traditional polysiloxane coatings, which enables it to better withstand the cracking and stress associated with exterior steel, tank, and building applications. The coating also combines the corrosion protection of conventional three-layer coating systems with the labor-saving benefits of two-coat application.

Due to its extremely low-VOC content, PPG PSX 805 coating meets strict GREENGUARD emissions criteria for interior spaces. In addition, unlike PPG PSX 700 coatings, which feature a glossy finish, PPG PSX 805 coating features a durable satin sheen that masks imperfections on steel surfaces.

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