Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site




Problem Solving Forum

| More

November 6 - November 10, 2017

What are the pros and cons of using an organic vs. inorganic zinc primer?

More items for Coating Materials

Selected Answers

From Marco Fabio Ramenzoni of ZINGA METALL BRASIL on November 10, 2017:
Let me agree 100% with my dear colleagues above, except for the organic zincs, which I agree also 100% on the cons, but only for TRADITIONAL organic zincs. For some special organic incs, such as a proprietary film galvanizing system, the cons become pros as follows: It does not need to be overcoated. Working very effectively as a stand-alone system, it performs powerfully in marine environments (C5M), Also immersed and in transition zones, it has very high sacrificial ability as an anode, resists damage and it is easily repaired with itself.

From Jithin Narayanan of JGC Corporation on November 8, 2017:
Inorganic zinc pros: abrasion resistance, corrosion resistance, applicable in low and high humidity (choose water-based or solvent-based depending on actual humidity), used as internal coating for alcohol tanks like methanol, high temperature resistance, good range of overcoatability, can be used under insulation where temperature is high enough that no water vapor is present. IOZ cons: mud cracking, difficult to control thickness on corners, difficult to repair by same coating, zinc dust generation during application (not safe in crowded site), high skilled labor required, curing takes longer, pinhole on succeeding coat especially in silicone and silicone acrylics, cannot be brush applied. Organic zinc pros: easy to handle and repair, can be brush-applied, suitable for all humidity, overcoating possible with most epoxies, IOZ can be repaired with OZ, no concern of popping up on succeeding coat, no high skilled labor required, barrier effect. Organic zinc cons: not a stand-alone coating, no high temperature resistance, less corrosion protection, cannot be used in marine environments as a single coat, cannot be used as an internal coating, less zinc participation in cathodic reaction, cannot keep long time without overcoating, not as wide a range of applicability as IOZ.

From Larry Muzia of Exceletech Coating & Applications, LLC on November 6, 2017:
Inorganic zinc pros: better abrasion resistance, can be a one- coat protective system in various environments, higher temperature resistance, direct-to-metal zinc contact, better edge protection, excellent protection in marine environments, low temperature cure provided sufficient humidity during cure, long pot life. Inorganic zinc cons: requires proper surface preparation with adequate surface profile, will mudcrack if applied too heavily, requires 50% humidity during cure, topcoat can pinhole without proper technique, requires higher level of applicator skill, overspray control required and increases with higher level of humidity, although appearing hard within hours curing should be confirmed before overcoating, low tensile strength. Organic zinc pros: more user-friendly than inorganic zincs, more tolerant of less than perfect surface prep, does not cause pinholing of topcoats, rapid overcoating with many formulations.  Cons: must be overcoated, zinc being encapsulated in organic resin does not give  the same level of sacrificial ability of anode/cathode does not resist handling damage as well as inorganic zinc.

Please sign in to submit your answer this question    

Tagged categories: Primers; Zinc; Zinc-rich (inorganic); Zinc-rich (organic)

Current PSF Question | Submit a PSF Question | Full PSF Archive

Mitsubishi Gas Chemical America
Performance Amine 1,3-BAC
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.

Jotun Paints Inc.
Jotun Jotachar 1709
Mesh-free passive fire protection epoxy designed to protect against hydrocarbon pool fire scenarios for up to four hours as defined in the ANSI/UL1709 standard.


SAFE Systems, Inc.
SAFE Systems'
Blast Lights &
Deadman Switches
Halogen or LED blast lights available with our NEW urethane bumper. Switches available in many colors for color coding your hoses.

Carboline Company
New product: Carbozinc® 608 HB
Introducing a new high build zinc-rich primer that can save you time and money by eliminating the epoxy intermediate coat!

New resins from BASF will have metals loving water!
Excellent corrosion resistance, low VOC, high gloss, thin films 800-231-7868

Fischer Technology Inc.
TSA Coatings on Stainless Steel
Fischer’s Phascope PMP10 and ESD20TSA probe are incredibly accurate and easy to use.

International Bridge Conference
Bridge conference 2018
Registration for the 2018 IBC is now open! Join us in June for the biggest and best IBC ever! View the Program, Workshops and Exhibitors by clicking in the banner.

Sauereisen, Inc.
Substrate Repair Materials

Substrate Repair Materials and Filler Compounds

Sauereisen's full line of underlayments are the ideal substrate repair materials to restore structural integrity prior to the application of SewerGard©

Modern Safety Techniques
Modern Safety Techniques
With our unique LTCat, we can help to provide clean, safe breathing air to your workers. Take a look at our Breathing Air Systems, we supply at least twice as much charcoal as our competitors! Modern


Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL

The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About   |   Privacy Policy   |   Terms & Conditions   |   Support   |   Site Map   |   Search   |   Contact Us