Actually, it's all of the above. The laminate gets tested, then is fabricated into a coupon, coated with solder mask and is tested again.
There are some who have used the word racket in conjunction with UL. The laminate manufacturer pays to have product tested to UL94. Then the fabricator manufacturer produces UL94 and UL796 coupons and pays UL to test. Successful testing allows the fabricator to pay UL an annual fee to be able to manufacture UL recognized components. Other manufacturers are required to use UL recognized components to mamufactore UL listed products. These products are slso tested ($$). Not using a recognized component requires additional testing ($$$).
To shorten a long story, UL recognition and listing only matters in the UL world of insurance companies and certain municipalities. There is seldom a difference between a recognized and non-recognized component of an otherwise identical grade. In a former life, we had an audit finding because the viton shrink sleeve was not UL rated. The difference between the rated and unrated product was the printing on the tube.
Don Vischulis
Sent from my iPod
On Mar 27, 2011, at 6:17 PM, Joyce Koo <[log in to unmask]> wrote:
> My understanding is the laminated or parts passed 94-V-0 test. That means, you get a lab with a burner and do it either by your self or done by your vendor.
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Jack Olson [mailto:[log in to unmask]]
> Sent: Sunday, March 27, 2011 05:53 PM
> To: [log in to unmask] <[log in to unmask]>
> Subject: Re: [TN] UL and Bare Board Fabrication
>
> That's what I was trying to ask, I just didn't know how...
>
> So if I'm interpreting this right, there must be some fabricator's who DON'T
> have this UL logo stamp thing, and there are materials that DON'T meet UL
> flammability requirements?
>
> Putting the UL safety certification subject to the side for a moment (not talking
> about that),
> is it the materials that are UL rated?
> or the fabricator has a UL rating?
> or both?
>
> Jack
>
>
> .
> On Thu, 24 Mar 2011 09:29:14 -0700, Paul Edwards <paul@SURFACE-
> ART.COM> wrote:
>
>> Don brings up a good point...
>>
>> There is the UL registered PCB fabrication process... then there is the UL
> listed/registered product...
>>
>> Some organizations will request PCBs to be built with a UL registered process
> firm as a method to completely certify that in the end they will have a UL
> listed/registered product after the completion of the UL product testing. Since
> PCB fabrication processes affect the reliability of the PCB which is integral to
> the overall product reliability and safety, then the PCB fabrication process can
> be considered as part of the overall product design, and would therefore be
> subject to review...
>>
>> BUT this PCB assembly process registration doesn't make the PCB a UL
> registered component as some people hope it will... For the PCB to get that the
> PCB itself must undergo design review and testing...
>>
>> Paul
>>
>> Paul Edwards
>> Process/Quality Engineering
>> Surface Art Engineering
>
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