6. What are the primary ASTM speciﬁcations Galvan follows for galvanizing?
ASTM A123 – Standard Speciﬁcation for Zinc HDG Coatings on Iron and Steel
ASTM A153 – Standard Speciﬁcation for Zinc Coating HDG on Iron and Steel Hardware
ASTM A143 – Standard Practice Against Embrittlement of HDG Structural Steel Products
ASTM A384 – Standard Practice for Safeguarding Against Warpage and Distortion
ASTM A385 – Standard Practice for Providing High-Quality Zinc Coatings (HDG)
ASTM A767 – Standard Speciﬁcation for Zinc Coated Steel Bars for Concrete Reinforcement
ASTM A780 – Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
ASTM A6386/D7803 – Paint / Powder Coat after Galvanizing Speciﬁcations
7. What masking materials do you recommend?
Masking is treating a portion of the steel surface so a speciﬁc area remains ungalvanized.
• GE 100% Silicone Caulk
• NAPA RTV Red
• DAP Household Adhesive
• Maskote Zinc Stop-Off
• Stop Galv
• Galva Stop
8. What marking pen do you recommend?
Markal Model # 96821G valve action paint marker. This will not affect the galvanizing process.
9. Is there a way to predict the life of a galvanized coating in my application?
Yes. The Zinc Coating Life Predictor is a free and easy- to-use software program available on the internet. The purpose of the software is to estimate a time to ﬁrst maintenance for hot-dip galvanized steel subjected to various atmospheric environments. You can access the Zinc Coating Life Predictor at https://galvinfo.com: 8080/zclp/index.html.
10. Why does it look too thick, too thin, not shiny, different colors?
The appearance of the hot-dip galvanized coating can vary from piece to piece, and even section to section of the same piece. The most common reason for these variances is the chemistry of the steel itself, particularly the levels of silicon and phosphorous. This is beyond the control of the galvanizer. It is important to note, however, that appearance has no bearing on corrosion protection and in time, after exposure to the environment, all galvanized coatings will take on a uniform matte gray appearance.