There's No Universal Answer for Trelleborg Rubber Products
After six years of specifying Trelleborg rubber products for our plant and for client projects, I've learned one uncomfortable truth: the question "which product should I use?" doesn't have a single answer. It depends on what the part is doing, where it's installed, and how long it needs to survive. And the truth is, I've made enough mis-specification mistakes to know better—roughly $4,700 worth, by my count.
That's why I now maintain our team's material selection checklist. And if you're in the middle of a rubber product decision, the first step is figuring out which of four scenarios you're in. Every request I handle falls into one of these buckets based on what the product actually does: sealing, conducting, carrying, or withstanding. Each has different rules, and each has a common mistake attached to it.
Scenario 1: Sealing PVC Window Profiles (PVC Fönster)
If you work in the Scandinavian market, "PVC fönster" needs no translation. PVC windows rely on rubber profiles for the sash seal and the glazing bead, and Trelleborg makes dedicated EPDM profiles for exactly this role. This is also where I made my first big mistake back in 2019.
The job was simple: replace a damaged window gasket in our office building. I matched the replacement by eye—measured the old profile's cross-section, ordered what looked like "the same thing." What I missed was the material class. The original was a solid EPDM compound at 70 Shore A with a compression set under 25%. The replacement was a sponge-grade profile that looked identical but had completely different rebound properties.
Six months later, the window sat loose in its frame. The sponge seal had taken a permanent compression set. $890 in rework, a week of delays, and a very quiet walk back to my desk. (2019 was not my year.)
"Looks the same" is not a specification. Write down the material class, the hardness, and the compression set before you order.
What actually matters for window sealing profiles:
- Material family: EPDM for UV resistance and long-term weatherability. Not nitrile, not neoprene.
- Hardness: Match the original Shore A rating. For PVC window gaskets, the 60–70 Shore A range is typical.
- Compression set: The number that prevents "stays squished" failure. Tested per ASTM D395, look for under 25% at 70°C for 22 hours.
- Exact geometry: Get the profile drawing number from Trelleborg's technical team. Measuring with calipers feels faster, but groove tolerances in PVC window frames are tight and a wrong guess means a useless batch of extrusions.
That failure is what started my checklist. My boss still mentions it at review time (note to self: it's been six years, Marie—let it go).
Scenario 2: Choosing a Pigtail Air Hose
Pigtail air hoses are one of those purchases that look too simple to get wrong. It's basically the coiled length of hose that connects your fixed air drop to a tool—keeps the workshop tidy and hoses off the floor. But I've seen orders go sideways when people treat a pressure-rated component as a workshop accessory.
In 2022, I nearly ordered a pigtail hose with a 90 PSI maximum working pressure for our compressor system, which runs at 145 PSI. The coil looked great, the price was right, and I only caught the mismatch because I checked the ratings before submitting the PO. It would have been a burst hazard waiting for the worst moment.
Check a pigtail air hose in this order:
- Working pressure: aim for at least 1.5× your system pressure. For a 100–150 PSI workshop compressor, that means 200 PSI or higher.
- Temperature rating: unheated workshops in Northern climates hit below freezing, and some polyurethane pigtails stiffen and crack in the cold. Hybrid polymer and rubber versions handle low temperatures better.
- Coil memory: the hose should return to its natural coil after being stretched. If a sample stays kinked, it'll fight you every single day.
- End fittings: match the thread pitch of your air drops. That sounds too basic to mention, but I've watched a colleague wait two weeks for 350 replacement pigtails because the fitting threads were wrong.
Bottom line: read the spec before you look at the price.
Scenario 3: Polyurethane Wheels vs Rubber
This is the debate that gets people stuck. Common instinct says polyurethane is the "premium" option and rubber is the budget alternative. That's not always true. The real decision factors are floor surface, load, and noise tolerance.
In 2023, I chose polyurethane wheels for heavy-duty trolleys in our paint shop. Load capacity was excellent, abrasion data looked great, and every spreadsheet said polyurethane was the right call. My gut was uneasy about the epoxy-coated floor. I went with the data anyway. Two months later, the trolley lanes had visible black tracking marks, and maintenance was buffing them out every week.
The framework I use now:
- Choose polyurethane when loads are heavy, the floor is bare concrete or steel, chemical resistance matters, and low rolling resistance is a priority.
- Choose rubber when the floor is delicate (epoxy, tile, painted), noise is a concern, or the trolley runs on uneven ground. Rubber absorbs shock and won't mark floors the way hard polyurethane can.
- The option most people skip: softer polyurethane (85–92 Shore A). It splits the difference between standard polyurethane and rubber, and often works better on mixed surfaces than either "standard" option.
Floor damage costs more than the wheel price difference almost every time. A $6 polyurethane wheel scuffing a $12,000 epoxy floor? That's not a bargain.
My gut was right that time. Now I check the floor surface first and the data sheets second.
Scenario 4: Silicone Profiles for Mold Work
The silicone resin mold category catches people off guard. If you're casting components, vacuum bagging composites, or building prototype tools, you often need silicone profiles to seal the mold perimeter or act as flexible mold inserts. Trelleborg carries silicone profiles for this type of service, and silicone should be your default for good reasons: temperature range, release properties, and compatibility with mold-release agents.
The mistake here is substitution. Silicone costs more than EPDM, and someone always proposes EPDM "for the trial run." I've seen it fail twice—once where an EPDM gasket degraded after repeated contact with mold-release chemicals, and once where a temporary EPDM seal in a heated mold frame embrittled after only a few cycles at around 120°C.
Key considerations for silicone in mold applications:
- Service temperature: silicone typically handles -60°C to +200°C, depending on the compound. EPDM tops out around 120°C for continuous service.
- Durometer: for sealing applications, 40–60 Shore A is a solid starting point. Softer materials conform better to uneven parting lines.
- Release characteristics: silicone's natural non-stick property is exactly what you want near a mold surface.
Don't substitute EPDM for silicone to save a few dollars per meter. The labor cost of a mid-run seal failure will eat that savings in an afternoon.
How to Tell Which Scenario You're In
If you're not sure which bucket your situation falls into, ask yourself these questions in order:
- Is the product exposed to weather or UV? You're in Scenario 1. Focus on EPDM and weatherability specs.
- Is it carrying pressurized air or fluid? You're in Scenario 2. Check pressure and temperature ratings before anything else.
- Is it supporting a rolling load? You're in Scenario 3. Decide between polyurethane and rubber based on floor surface and load, not on which sounds more premium.
- Is it facing high heat or mold-making chemicals? You're in Scenario 4. Silicone is the material family—don't substitute.
I'm not a polymer chemist, so I can't speak to compound formulation at a molecular level. What I can tell you from a procurement perspective is: if you're still unsure after checking your specs, a 10-minute call to Trelleborg's technical support is a lot cheaper than a reorder.
This guide reflects my experience as of Q1 2025. Trelleborg's range evolves and material availability changes, so verify current specs against the latest technical datasheets before ordering. Don't hold me to specific product codes—those change more often than I'd like.
Final Thoughts
Trelleborg rubber products work well across a huge range of industrial applications. But "solid" doesn't mean "interchangeable." Window sealing profiles, pigtail air hoses, polyurethane vs rubber wheels, and silicone mold profiles are four different decisions with four different rule sets.
When I stopped treating every order as a one-off and started using a structured process, our rework costs dropped by roughly 80%. Process beats good intentions, and the checklist is the process.