Hi Tony -

I think it should be no problem to get Cr+6 standards from your usual Reagent supplier. Cr+6 standards are widly used by metal finishers and QA/Safety Labs.

However, you should specify to them the spectrascopy method (eg, ICP emission, Atomic Absoption, Ion cromotography, etc). Don't forget to ensure the actual lot analysis is included on label or certificate.

You may need more than one depending on the dectability limit and expected range.

One point I'd like to stress is the digestion method used to prepare the test specimens is importiant when testing for Cr+6 in platics (eg, as catalysit or pigment) since some platics are very resistant to chemical digestion. If you have a microwave digestion unit that would be the best method (ie, weigh sample, microwave digestion, dissolution, test).

C.B. Katzko, CTO
Meadville Group
e-mail [log in to unmask]
tel +86 21 3774 7528
fax +86 21 3774 7590
mobile +86 13817362590

+++ Please note new tel & fax numbers. +++

Tony Kwok <[log in to unmask]>
发件人: TGAsia <[log in to unmask]>

2008-01-23 10:38

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主题	Re: [TGA] RoHS管制+6价的Cr，为何是离子态的管制？

Hi Chris, Benjamin,

I am glad to learn from you guys about Cr+6 existing form and would like to ask you whether you know where I can find and procure the standard sample of pure Cr+6 for calibration of the Spectroscopy machine since XRF equipment can not accurate measurement and can only show the Cr+6 existence.

Regards,
Tony Kwok
Quality & Engineering Manager
Aoki Laboratories Ltd.
Pinhu Aoki Laboratories Solder Mfg Plant
電話:0755-28455086
傳真:0755-28453518
手機China Mobile:13828708559

From: TGAsia [mailto:[log in to unmask]] On Behalf Of John Ling (Jiazhao Ling)
Sent: Thursday, January 03, 2008 1:16 PM
To: [log in to unmask]
Subject: Re: [TGA] RoHS管制+6价的Cr，为何是离子态的管制？

Hello, Chris:
Glad to get your information.As I am working on electronic product assembling manufacturing, I am interested in Cr+6 coating.
Most of screw supplier use Cr+6 on screws plating, now they have changed liquid to Cr+3. But we found Cr+3 is not so black as Cr+6.Do you have any experiment on it?
For metal, we have ink painting and powder coating, I don't know if there are Cr+6 on these process.

Thanks!
John Ling
Loud China

----- Original Message -----
From: Chris Katzko
To: [log in to unmask]
Sent: Thursday, January 03, 2008 11:43 AM
Subject: [TGA] 答复: Re: [TGA] RoHS管制+6价的Cr，为何是离子态的管制？

Hi Ziyi -

Please note the pollowing points about Cr+6:

1. Testing by XRF should only be doine as an audit mechanism since the accuracy is inferior to spectrascopy. All test for certification to customers should be by spectrascopy ir some may reject or challange the report.

2. The main use of Cr+6 in electronics is as "Chromate" coating of metals and pigment (colorant) in inks, paints and plastics.

3. Some OEMs are requiring more strict limits for Cr+6 and Cd. I suggest to check your customer's specifications carefully, especially Japanese customers or OEMs of monile phones. In this case "Green" requirements may exceed RoHS.

Regards,

C.B. Katzko, CTO
Meadville Group
e-mail [log in to unmask]
tel +86 21 3774 7528
fax +86 21 3774 7590
mobile +86 13817362590

+++ Please note new tel & fax numbers. +++

Benjamin Chen <[log in to unmask]>
发件人: TGAsia <[log in to unmask]>
2008-01-02 17:31

请答复给
Asia Committe Task Group Forum <[log in to unmask]>; 请答复给
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Re: [TGA] RoHS管制+6价的Cr，为何是离子态的管制？

Hi Ziyi,

As the supplementary information for other's answers.

It is because the Cr6+ is more toxic than Cr or Cr3+, but its existence in nature is by chemical compound in solid state with other ions or ionic groups. The analysis is to measure how much of chromium existed as the state of Cr6+ in the chemical compounds of the product. Though existed in chemical compound state (solid), when inhaled or other ways into human bodies, it will be then decomposed into Cr6+ in human body (as the salt dissolved in blood or water) to cause toxic reaction. How we verify the existence of Cr6+ is usually by X-Ray Fluorescence (nondestructive), UV-Visible Spectroscopy (destructive) quantitatively, or other known chemical reactions quantitatively or qualitatively.

Hope this helps, and please feel free to let me know if any further information necessary, thank you very much!!

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Benjamin Chen
Regional Technical Coordinator, Asia-Pacific
Consulting and Training
Underwriters Laboratories Taiwan Co., Ltd.
Tel: 886-2-2896-7790 ext. 62267, Fax: 886-2-2896-6140
[log in to unmask]
- Know by test, and state the facts. -
Web site: http://www.UL.com.tw

Ziyi Li <[log in to unmask]>
Sent by: TGAsia <[log in to unmask]>
01/02/2008 04:59 PM

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Subject
[TGA] RoHS管制+6价的Cr，为何是离子态的管制？

Dear All：
为什么RoHS管制+6价的Cr?在我认为：固态的产品（电镀层）如何出现离子态，很另人困惑~,恳请各位支招!
谢谢!
Best Regards
************************************************
支架事业处工程&品管课长李子祎
扬州华夏集成光电有限公司
地址：江苏扬州经济开发区扬子江南路518号(邮编：225009)
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