Here's the short version: Trelleborg makes excellent seals. But ordering correctly from them—or any large supplier like them—requires you to ask one specific question most people miss. I don't mean 'what's the price.' I mean 'what are the exact parameters on the print?' Missing that detail cost my company $2,100 in wasted parts in Q4 2023. Here is exactly how it happened and how you avoid it.
How I Paid $2,100 for a Lesson (Fall 2023)
In September 2023, I put in an order for 220 custom silicone gaskets. The application was straightforward: food-grade, high-temperature, meant to seal a steam line on a filler machine. Submitted the PO through what I thought was the correct channel—a distributor we'd used before—with a spec sheet I assumed was complete.
The gaskets arrived in Week 5. They fit the bolt pattern perfectly. They were the right durometer. The color matched. But they failed within 48 hours of installation—swelled, softened, lost their seal. (Ugh.)
I assumed "silicone" and "high-temperature" were enough. Didn't verify the specific compound grade against the application's temperature curve. Turned out the standard 70-durometer silicone they supplied was rated for continuous 450°F. Our application had spikes to 550°F for 20 seconds at a time during the CIP cycle.
We had to quarantine the lot. $1,400 in materials, $700 in expedited freight for the replacement material, plus 16 hours of rework labor that I don't even want to calculate. Straight to the scrap bin. That's when I learned the hard way: Trelleborg's catalog is massive. It's also very easy to order the wrong thing if you assume your general spec is enough.
The Real Challenge: It's Not the Quality, It's the Fit (Literally)
Here's something vendors won't tell you: the first quote you get for a custom part assumes you know exactly what you're asking for. If your spec is vague, you'll get a part that meets the quote—but maybe not your actual need.
What most people don't realize is that 'high-temperature silicone' or 'food-grade rubber' covers a huge range of actual materials. You need specifics:
- Continuous temperature range (not just max peak)
- Chemical resistance needed (what exactly is contacting the material?)
- Pressure spec
- Compression set requirement
- Specific hardness/durometer (Shore A is standard for rubber)
When I compared our original failed spec versus the corrected spec side-by-side, I finally understood why the difference between 'silicone' and 'LSR' (liquid silicone rubber) matters so much for applications with intermittent heat spikes.
Seeing our rushed orders versus standard orders over a full year also made me realize we were spending an additional 35% on artificial emergencies—because we didn't spec things properly the first time.
The Two Questions That Changed Everything
After the September disaster, I created a mandatory pre-order checklist. We review it before sending any custom part spec to Trelleborg—or any supplier, really. The two most critical additions I made were:
- "Ask for the test data." Don't just take 'certified' at face value. Ask for the specific material data sheet for the compound being used. Trelleborg compounds have specific codes. Get the sheet, check the temperature curve against your peak and continuous temps.
- "Don't describe the material—describe the environment." Instead of saying 'I need a seal for a steam line,' say 'The seal contacts food-grade steam at 135 psi, with intermittent CIP chemical wash at 180°F for 30 minutes daily.' It forces the supplier to match the actual need, not your (possibly incorrect) label.
We've caught 14 potential mismatches using this two-question approach in the past 14 months. Each time, it saved us not just the cost of the part (which can be $50-$200 for a custom gasket) but the cost of failure—which is always much higher due to downtime and potential contamination.
What Trelleborg Is Great At (And Where You Still Need To Be Careful)
Look, I'm not here to bash Trelleborg. Their engineering-grade thermoplastics and silicone tubing are legit. They cover a huge range—O-rings, profiles, custom extrusions—and they have the material science to back it up. But that range is exactly the trap. A large catalog means more ways to accidentally order something close-but-wrong.
Seeing our original request (vague 'silicone') vs. the corrected one (specific compound) made me realize that spec sheets are the most critical document in your procurement process. The person approving the design and the person writing the PO need to be in lockstep. They often aren't.
Your Next Step (One Thing To Do This Week)
Here's a concrete suggestion: go grab the last 3 custom seal orders your team placed. Look at the spec sheet that was sent with the PO. If it says something generic like 'Silicone. High temp.' without a material compound number or a service condition description, you have a risk window.
Update that template. Add a section for 'Environment Description (include temperature range, chemical contact, pressure, duration).' It's a 10-minute fix that can save you a 1-week emergency reorder and a lot of frustration (and money).
One important caveat: This applies specifically to custom or application-specific parts. Standard parts from the catalog (like a standard AS568 O-ring in a known material like Buna-N or Viton) have tighter spec controls and are less risky. The danger zone is the 'custom' space where you think you know what you need, but the supplier has to interpret your intention.
Pricing as of early 2025; verify current rates and material specifications with your sales contact. Regulatory information is for general guidance only—always consult official sources for current requirements in your jurisdiction.