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Join Date: Mar 2007
Location: China
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Die Casting and Painting

12/05/2007 10:44 PM

I am doing die casting for my customer by his print in China.The print require the casting to be painted.and the specification as following:

Notes:

1. NO DOUBLE PAINTING WILL BE ACCEPTALBE.

2.FIXTURING THE RING FOR PAINTING:EXTERNAL BLEMISHES ARE UNACCEPTABLE

3.COMPLETE COVERAGE INSIDE AND OUTSIDE

4.PAINT:FULLER O BRIEN CORP. NO. EFB-40B-53(PRIMARY) BLACK EPOXY

FULLER O BRIEN CORP. NO. EFB-504-50(ALT.) BLACK EPOXY

5.DO NOT USE SILICONE SPRAY AS A RELEASE AGENT IN THE DIE CASTING PROCESS

6. .001/.002 thickness

1.Is there anybody can tell me what the item 1 means?Why double painting?

2.it require no external blemishes,so we will fix inside to painting.

4. Is there anyone can tell me the performance of the FULLER PAINTING?I can not get it by google.

5.What the item five means?why silicone spray?

In addition,according to above specification,anyone can tell me powder painting or spray painting is better?

Because I do cast and machining,so I am not very clear about painting.

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Anonymous Poster
#1

Re: Die Casting and Painting

12/06/2007 8:51 AM

Please don't use any lead paint, especially if the diecasting your doing is for toys.

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#2
In reply to #1

Re: Die Casting and Painting

12/06/2007 9:14 AM

the painting is OK for Rohs.

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Anonymous Poster
#3

Re: Die Casting and Painting

12/06/2007 11:39 AM

Several issues here. First off, the comment about double painting might be related to overspray or multiple coats of paint that doesn't form a contigious coat on the part.

you will most likely need to paint over the fixture marks in the inside if coverage is required. The paint is an epoxy which is difficult to spray. Powder coating is a different process and is not likely to be a spray.

The company name is "Fuller O'Brian" corp. I would guess that the numbers are some sort of catalogue item.

Silicon spray is not compatiable with painting, you will have adheasion problems if there is silicon beneath the paint coating.

Painting is a specialized field and is very difficult to get right for critical customers. There may be color requirement that must be measured with a colorometer and texture on the casting. Getting an acceptable finish can be a major problem, based on my experience. Die condition, operating temperatures, shot profile and other factors are very important to getting an acceptable job. I respectfully suggest that you need more information to be successful on this job, especially if you have no previous experiance working with painted castings. Any questions, let me know.

paulh@intemag.com

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Anonymous Poster
#4

Re: Die Casting and Painting

12/07/2007 8:15 AM

1. No double painting because they are concerned with the thickness the paint adds. Poweder coat will be no good because it tends to be even thicker than paint. An eposy paint is also a very thick paint.

2. Don't mark up the piece by leaving clamp marks on the outside. Like if you would put it in a vise and over tighten.

3. Don't leave any bare spots unpainted.

4. Use these paint #s from this company. Use the first one and if you can't get any of that color you can use the second # as a backup.

5. If you use silicone as a mold release it will affect the paint adhesion and it is very difficult to remove ALL the silicone before painting.

6. This is the thickness the paint should add, no more, no less.

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#5
In reply to #4

Re: Die Casting and Painting

12/07/2007 10:11 PM
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