UV Absorption Test - What is it's purpose and what specifically is it looking for?

dore_m

Starting to get Involved
#1
Hello. I'm new to this forum and it looks like I've found a great resource and community for future work....

My company is working on a catheter product that involves plastic, UV glue and needle. We notice that there is a common UV absorption test that needs to be done involving a wavelength range of 250 nm - 320 nm. This test is found in a number of standards, including ISO 8536-4:2010.

Does anyone know the purpose of this test? I mean, what specifically is it looking for?

-Dore
 
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isoalchemist

#2
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

:2cents:Can you provide a bit more information such as a reference for the testing. I've been out of the labs for too many years but I believe most plastics do not absorb in that range, but the additives would. It may be a "purity" check. At this point its just a guess.
 

Hershal

Metrologist-Auditor
Trusted Information Resource
#3
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

This is also required under IEC 60601-1 and the -2-xxx series. It is looking for damage across the UV range that may occur to the instrument in question. There are additional standards where such radiation testing (and more than UV as well) is required, for example, a specific version of the test is required if a lab wants to have photobiological in the scope of accreditation.

Hope this helps.
 

Ronen E

Problem Solver
Moderator
#4
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

Hi,

It might be for detection of un-cured leftovers of UV curable adhesive.

Since the test is done on an extract solution, I believe it has little to do with the integrity of the infusion set itself.

Cheers,
Ronen.
 

dore_m

Starting to get Involved
#5
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

Let me try to explain:

The plastic is PP and the needle is stainless steel, sourced from a catheter company. We used commonly used UV curable adhesive (I don't remember which), etc.

We have an official testing house that is telling us that our samples don't pass the test, yet we've sent a set from the same batch to another test house and passed without a problem. I'd have to get with one of more technical people to give more specifics.

-Dore
 

Ronen E

Problem Solver
Moderator
#6
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

Let me try to explain:

The plastic is PP and the needle is stainless steel, sourced from a catheter company. We used commonly used UV curable adhesive (I don't remember which), etc.

We have an official testing house that is telling us that our samples don't pass the test, yet we've sent a set from the same batch to another test house and passed without a problem. I'd have to get with one of more technical people to give more specifics.

-Dore
Hi,

If I had both test houses test reports in front of me, I might have been able to comment. Otherwise, it's just guesswork.

Sorry,
Ronen.
 

dore_m

Starting to get Involved
#7
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

Ronen-

Thanks for your help. The other day, the official test house called us and just told us over the phone that we didn't pass. We're meeting with them tomorrow to try to get the test data.

But prior to sending our samples to the official test house, we sent to another for pre-confirmation. We have this report, and the curve basically looks like a line descending from (250 nm, 0.076) to (320 nm, .03). We also have the curve from 200nm to 800nm. It looks like an inverse square curve.

The official test house told us over the phone that our level was 0.13/250nm, but did not elaborate. We need below 0.1 to pass. We may not get a report from the official test house - but we can ask for information. Is there something in particular you would recommend?

Again, thanks for your help.

-Dore
 

Ronen E

Problem Solver
Moderator
#8
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

If there is only one report, I don't see where the problem is.

BTW, does the report you have on hand come from a qualified / accredited test house?

Please feel free to send me a private message if there are details you don't wish to expose.

Cheers,
Ronen.
 

dore_m

Starting to get Involved
#9
Re: UV Absorption Test - What is it's purpose and what specifically is it looking for

Since I'm new to the forum, I can't yet send you a PM.....
 
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