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topic 6986

JS500 zinc plating


Dear Sir,

Could you please tell me what is JS500 zinc plating. One of my customer need their flange bolt zinc plated as per JS500.

Your reply will be highly appreciated!

Best Regards,

Tony Han
- Qingdao, China

First of two simultaneous responses-- (2001)

JS500 is a patented process by Macdermid. I believe it was developed for automobile applications, with a very high corrosion resistance. You need a license from MacDermid and purchase the equipment and chemicals from them. I hope this helps.

Carlos Cielak
plating shop - Mexico City, DF, Mexico

Second of two simultaneous responses-- (2001)

JS500 is a brand name for a topcoat, not a specification. JS500 is a brand name belonging to Macdermid. You are looking for a zinc electroplate followed by a conversion coating, which is then followed by an extra topcoat layer. The purpose of a topcoat is to give the plating additional performance.

There are other types of topcoat, like Corrosil from Atotech or Enseal from Enthone. Most plating chemical vendors can offer you their own selection of topcoats and MacDermid is not the only one out there.

MacDermid has a list of licensed applicators available if you are looking for JS500. You can contact Macdermid at 245 Freight Street, Waterbury CT 06702.

tim neveau
Tim Neveau
Rochester Hills, Michigan

June 2, 2008

Dear Sir,
one of my customers wants some equivalent coating for JS500. can we suggest Geomet for the same sst life and RoHS compliance ?
if there is some other equivalent coating, please let me know.

Manoj Kumar
- India

June 2, 2008

Hi, Manoj. Geomet (zinc-rich dip-spin coating) is very different from JS500 (electroplated zinc with proprietary topcoat) and they are not equivalent even if both are RoHS compliant and offer sufficient salt spray life. That is not to say that one is better than the other.

A plating shop can comply with the design engineer's specifications or they can work with the design engineer to assist him in specifying the finishing; but they don't know his state of mind and all the reasons for his choices, and they can never take it upon themselves to think they can read his mind and substitute one finish for another. Sorry.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

April 7, 2009

Hi Manoj,

You need JS 500 ElectroPlating process or equivalent to JS 500. Because JS 500 is a One of the Zinc plating with relevant top coat. Its a Zincklad family and different from other process. In India some automotive companies using JS 500 plating process. what is your requirements of salt spray hours, plating thickness and torque and tension control. then we will select the process or equivalent process.

Guruvin Singh
- Chennai, India

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