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Inorganic Zinc-Rich Primer

Last edit date: 10/8/2025

Inorganic zinc primer is used for coating new structural steel used on California Department of Transportation (Caltrans) projects. Uses are typically steel in bridges, soldier pile walls, and column casings.

Specification requirements for inorganic zinc primer are in Section 59-2 and Section 91-2.02A of the 2024 Standard Specifications. Coatings selected from the list must meet the volatile organic content (VOC) restrictions of local Air Quality Management Districts in which they are applied.

Evaluation Criteria: Inorganic Zinc-Rich Primer Authorization Requirements and Acceptance Criteria.

Manufacturer Product Name AASHTO M 300 Type VOC, g/L Expiration DateBABA Act Information*
Carboline Company Carbozinc 11 HS I 288 6/2027Manufactured product, domestic source reported
Carboline Company Carbozinc 11 VOC I 389 6/2027Manufactured product, domestic source reported
Carboline Company Carbozinc 11 WB II 0 6/2027Manufactured product, domestic source reported
International Paint / Akzo Nobel Interzinc 22 I 490 6/2027Unconfirmed
International Paint / Akzo Nobel Interzinc 22 HS I 340 6/2027Unconfirmed
PPG Protective & Marine Coatings Dimetcote 21-5 II 0 6/2027Unconfirmed
PPG Protective & Marine Coatings Dimetcote 9 I 491 6/2027Unconfirmed
PPG Protective & Marine Coatings Dimetcote 9H I 8323 6/2027Unconfirmed
Sherwin-Williams Company Zinc Clad II Ethyl Silicate I 462 6/2027Manufactured product, domestic source reported
Sherwin-Williams Company Zinc Clad II Plus I 320 6/2027Manufactured product, domestic source reported
Sherwin-Williams Company Zinc Clad XI II 0 10/2027Manufactured product, domestic source reported

Products on this Authorized Material List (AML) are products that have been evaluated and found acceptable for use, provided the products are used in accordance with the manufacturer’s instructions. Products do not have to be sampled from the source or need to be authorized by the Department prior to use. Caltrans may perform additional job control testing during construction or installation.

If you have questions about this AML, please contact the Caltrans Chemistry branch by e-mail.

Caltrans contact: Chemical Testing Branch, chemistry.branch@dot.ca.gov

*As attested to by the supplier.

The California Department of Transportation (Caltrans) is implementing statutory changes required by the Bipartisan Infrastructure Law – Build America, Buy America Act (BABA), which expands Buy America to additional construction materials, in addition to steel or iron materials and manufactured products.

https://www.fhwa.dot.gov/construction/cqit/buyam.cfm