That is why "German rubber" is preferred. The crap from China almost always uses inferior compounds, which then quickly deteriorate. Even something that worked well in the past will get cheapened after a few years (or months) and will be inferior.

I have seen that happen across many Chinese products, even those made to stringent specs for OE suppliers. It's just Chinese business culture. If the buyer does not have their OWN representative keeping an eye on production, the manufacturer will cheapen something and pocket the extra profit.

With that warning, I can say again that my experience with the URO windshield gasket I bought 4 years ago has been very good. The fit is better than the Porsche gasket, and so far it's standing up to the weather very well.

I didn't bring up the topic to dump on any brand, because it applies to all companies. I have seen custom rubber products provided by top tier military contracts turn to brittle junk in a year or so, and then the new replacements from a different vendor have the same problem. Lead used to be a common additive to rubber products, it's been removed, and I believe this is causing issues, as well as changes to sovents that can be used. Natural rubber got much more expensive due to covid lockdowns and trade issues, so less natural rubber is being used in the blend for final products.
I have never had to spec out or engineer a peculiar rubber product, I though thisight be an opportunity to talk with the people who actually do this professionally to learn from there experiences.
David
Performance EngiNerding

Sourcing good rubber overseas is challenging, as folks have said. Rubber suppliers can be tempted to dial back the percentage of natural rubber (expensive), and up the percentage of carbon black (cheap) to save money. Even with vendors who do a good job maintaining the proper ratio, our QC engineers still have to routinely test production material given the long supply chain.

Wikipedia:
The most common use (70%) of carbon black is as a pigment and reinforcing phase in automobile tires. Carbon black also helps conduct heat away from the tread and belt area of the tire, reducing thermal damage and increasing tire life. Its low cost makes it a common addition to cathodes and anodes and is considered a safe replacement to lithium metal in lithium-ion batteries.[6] About 20% of world production goes into belts, hoses, and other non-tire rubber goods. The remaining 10% use of carbon black comes from pigment in inks, coatings, and plastics, as well as being used as a conductive additive in lithium-ion batteries.

So @UROParts , 964 seals... ja oder nein?

Hi guys, we double-checked the numbers and there are less than half as many 964's as there are buyers for the earlier seal, so unfortunately the tooling cost to make a 964 windshield seal is too high compared to potential sales. Wish it penciled out, but as of now it's not going to happen.

This is outstanding feedback! I’m about to do all of my window seals, and knowing that the quality of the Uro part seems to be very good on top of super fit has me thinking that the OEM part is not what I’ll be using for the windshield (or rear window.)

^ Hi Evan, we're completely out of stock for Rear Window Seal 911 545 225 00 for coupes, and are currently redesigning this seal to improve fit in the corners. The updated seal probably won't be available until sometime in 2025, so you may want to go with an alternative in the meantime.

Isby... That is indeed a nice fit. Would you please post your windshield type and part number if you see it. I've been at my front glass & seal for years looking for a nice fit. Good money has relentlessly chased bad in my case. I gave up years ago... maybe you can help solve this puzzle.

Ok, thanks for the heads up!

Good to see your posting. I will be sure to try the new front windscreen seal, when It becomes available.

The rear windscreen seal, I will just offer this. I bought 2 x Uro versions in 2016/2017 for a 911, the fit was so bad, that I never used any aftermarket window rubbers for 911s every again. I switched immediately to genuine Porsche. Unfortunately its too long ago to share any part/batch numbers, but good to know that you are re-designing it! We do not want our cars to leak!

I am not fussy about other seals, but I certainly don't want my windows leaking. I will give URO a shot again when I see the new seals. Well done for being on here, you will gain valuable feedback which can help you produce better parts in a quick feed back system, this will improve your sales through new and repeat custom!!

Sorry that you're having a difficult time with the front glass. I've been there. Anyway, the glass is Pilkington, which I sourced through Stoddard (as I recall, it was not available through our host). Here is the Stoddard description: "SIC-541-011-06 Windshield for 911, Green tinted with center pad for mirror mount. For 911 1978-1989 91154101106 SIC54101106 - SKU: SIC-541-011-06." I used the re-designed Uro seal and the genuine Porsche trim pieces from our host.

I should add that I also had to replace the upper dashboard, which had warped just enough over the years to prevent the glass from sitting correctly.

Am going to look into this. Much appreciated Isby.
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Hello auto, Is your 911-545-225-00 rear window seal available via pelican at the moment?

Hi Pete, do you mean URO? Unfortunately we're completely out of stock for Rear Window Seal 911 545 225 00 for coupes, and are currently redesigning this seal to improve fit in the corners. The updated seal probably won't be available until sometime in 2025, so you may want to go with an alternative in the meantime.

Hey Uro any update on when we can expect the 911-541-225-04-M253 back in stock? I desperately need one!

^ We're getting closer on having Windshield Seal 911 541 225 03 / 911 541 225 04 available again (ETA is late 2024), thanks for your patience. Technically this will be a new version of the seal, but it should be very similar to the highly-regarded last version.

Tags: 91154122503, 91154122504

Uro you have been running out of these for years . . why can't you just make more . . and why change the seal when the old one worked so well?

Looks like there aren’t any good options for the 964 windshield as of yet which is a bummer since I’m planning to change the glass soon. Hopefully the shop can reuse my existing seal.

I have a few extra seals, one back and a few front, get in touch if you need one.

I recently put a URO front windshield seal in and I noticed the outside lip had noticeably more length than the Porsche brand one, which can help on corners, etc. One improvement that would help is more length on the inside on the top. The much thicker aftermarket headliner could have been causing issues too. Overall they work well, especially if you are having difficulty with other manufacturers. The Porsche brand rubber seems different than 10 years ago, smaller or something...

In my experience every car is a little different and each rubber fits differently. The orientation of the rubber on the glass makes a huge difference when you are trying to fit the trim. I use a thin nylon ish rope (2 mm or so, no too thick) with soapy water in a spray bottle. The windshields often go in low if you are not careful. I like to use little foot long sections on each side to center the windshield before the final pull. I have never used the "Porsche Windshield Glass Spacer - 91454190710 " but I recently purchased some for next time, I hear they help.

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