Aloha, fun & authoritative answers -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Metal finishing Q&As since 1989

-----

Zinc plating spec ASTM B 633

July 12, 2012

Q. ASTM Specification B 633 lists four classes of zinc-plating: according to this standard, total 4 classes are given below -- but in this the number indicates the coating thickness in microns (µ). Since that, my question is why only 5µm for class I? Why not 6 or 7 µm? My question is same to the all below classes?
Kindly help me out.

Fe/Zn 5-class ?
Fe/Zn 8, class ?
Fe/Zn 12 class ?
Fe/Zn 25.class ?

Regards,

Kti Keyan
employee - Bangalore, Karnataka & India

A. Kti

If you look at the specification (obtain a copy if you have not done so already) you will see that the thicknesses provided in Table 1 are the minimum for the respective class.

Willie Alexander
- Colorado Springs, Colorado
July 13, 2012

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: