Hi Benjamin,
Thanks for your comments.
That mean’s the distortion could cause the test failure?
If yes, then we can try to control it because I don’t know the distortion
whether really could affect the test failure.
Thanks and best regards,
Justin Wu
Utilux South China Ltd
Phone: +86-755-2850 7521
Fax: +86-755-2850 0927
E-mail Address: [log in to unmask]
From:
TGAsia [mailto:
Sent: Thursday, November 27, 2008
12:58 PM
To:
Subject: Re: [TGAsia] Hi-Pot Test
Failure (2250V/3S/3mA)
Hi,
Thanks for this picture, it can tell further
information. I would think it is a molding defect which usually tells us
that something goes wrong. The distortion is usually caused by injection
condition inappropriately set up. It could be due to excess stress
because the mfr wants to make product faster, or save money by diluting or cool
product prematurely, or even more, getting more regrind or recycle ratio. It
could be due to not enough of temperature or heating time for the mixing of
carbon black to cause anisotropic distribution resulting in a higher
conductivity path. Molding condition must be changed with ambient
condition as well. You can't expect the same condition can apply both in
winter and summer. Comparing the product at as received condition with
after annealing can tell whether molding was performed the same.
I would then recommend you to analyze whether the
failure relates to any of process parameter, especially with weather
(temp/humidity) since plastic flow/mixing heavily related to temp and humidity.
Hope it helps.
|
justin
<[log in to unmask]>
11/27/2008 11:27 AM
|
|
Hello Benjamin,
Thanks for your quick response on
this.
The molder did say the mold no any
dirty or inlet and the other passed samples is the same as test conditions.
Whether the housing exists distortion after molding could be caused by this
problem?
[log in to unmask]">
Thanks and best regards,
Justin Wu
Utilux South China Ltd
Phone: +86-755-2850 7521
Fax: +86-755-2850 0927
E-mail Address: [log in to unmask]
www.utiluxchina.com
From:
[log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, November 26, 2008 6:39 PM
To: Asia Committe Task Group Forum; justin
Cc:
Subject: Re: [TGAsia] Hi-Pot Test Failure (2250V/3S/3mA)
Hello,
Have you ever check with molder whether they have dirty mold or inlet? 0.6%
of failure may not be caused by design problem... or maybe you can check
whether other passed samples are similar in breakdown voltage?
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Benjamin Chen (Mobile: +886-987-587-021)
AP Consulting
Underwriters Laboratories Taiwan Co., Ltd.
Tel: 886-2-2896-7790 ext. 62267.
[log in to unmask]
- Know by test, and state the facts. -
Web site: http://www.UL.com.tw
|
justin <[log in to unmask]> 11/26/2008 05:34 PM
|
|
Hi All,
Good afternoon!
I am currently having face the Hi-Pot test failure with 2250V/3mA/3S problem and
that the failure rate about 0.6%. The details see attached files shown. For
this problem, we have sought for a lot of solution, but still failed at final.
So which expert can share your experience to me on this? (Whether the test
condition too tight?)
Thanks in advance!
TBest regards,
Justin Wu
Utilux South China Ltd
Phone: +86-755-2850 7521
Fax: +86-755-2850 0927
E-mail Address: [log in to unmask]
www.utiluxchina.com
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