Covestro Products: A Buyer's 3-Step Guide to Sourcing High-Performance Polymers (and Why Silicone Isn't Plastic)

Who This Guide is For

This is for anyone currently filling out a spec sheet for a new project and wondering if they should be looking at Covestro products, Covestro resins, or something else entirely. Maybe you've been told to look at "PPS plastic" for a high-temp application, or you're trying to understand what "Baydur polyurethane" actually means for a structural foam part. I've been there—and I've made some expensive mistakes before I had a process.

Here's a three-step checklist that saved us from overpaying on the wrong material more than once. It will take you from the product catalog to a quote you can trust.

Step 1: Define the “What” – Don't Start with a Brand Name

The biggest mistake I see (and made myself) is starting a search for “Covestro products” without first knowing what you need the polymer to do. A brand is a shortcut, not a solution.

Before you even look at the Covestro website, write down three things:

• Thermal requirement: What is the continuous service temperature? (e.g., 120°C, 150°C). If you think you need “PPS plastic” (Polyphenylene Sulfide) because it handles 220°C, make sure that's actually a requirement. I once specced PPS for a connector housing that barely saw 80°C—overkill and over budget.
• Mechanical stress: Impact resistance? Flexibility? This is where Covestro's polycarbonate (PC) and TPU come in. PC is tough; TPU is flexible.
• Environmental factors: UV exposure? Chemicals? Hydrolysis? This is a specific strength for Covestro. Their hydrolysis-resistant polycarbonate grades are a key advantage if your part is in a humid or wet environment.

Checkpoint: Have you asked yourself, “Could a standard polycarbonate or a generic TPU do this job before I look at the specialty grades?” If the answer is yes, you might just be buying a solution looking for a problem. If the answer is no, you're ready for the next step (which, honestly, is the fun part).

Step 2: Map the Product Family – Covestro's Core Offerings

Once you know what your application demands, map it to Covestro's main product families. Here is the simplified version I use:

Polycarbonate (PC) and Blends (PC/ABS)

This is their bread and butter. If you need transparency, impact strength, and dimensional stability, you are in this zone. Think housings, automotive interior parts, medical devices. “Covestro resins” often refers to the Makrolon® and Bayblend® series. The hydrolysis-resistant grades are a real differentiator here; if your project involves a water filter housing or a medical device that gets sterilized, pay attention.

Thermoplastic Polyurethane (TPU)

This is for flexibility, abrasion resistance, and durability. Cables, tubing, phone cases, footwear. Covestro's Desmopan® line is well-known. The “bio-based TPU” and “recycled TPU” grades are increasingly important for sustainability claims, but verify the mechanical data sheet (ugh, I've seen people assume a bio-grade has the same shore hardness—it often doesn't).

Polyurethane (PU) Systems – Baydur®

This is where things get specific. “Baydur polyurethane” is a brand name for Covestro's polyurethane casting resin systems used for structural foam molding. It's not a film or a thermoplastic; it's a reactive system used for thick, rigid, lightweight parts like medical device housings or agricultural equipment panels. If you have a metal replacement project where weight and stiffness are critical, this is the category to explore.

Checkpoint: Have you narrowed your search to one (possibly two) of these families? If you are looking at “PPS plastic” because of a temperature spec, you should be looking at high-heat polycarbonates or special polyamide blends—not standard PC. If you are looking at “Baydur,” make sure you are set up for liquid casting or reaction injection molding (RIM). It's not injection-moldable like PC resin.

Step 3: Find the Balance – Total Cost, Not Just Material Price

Here's where my procurement brain kicks in. The price per kilogram of a Covestro TPU can be scary compared to a generic TPU. But I learned the hard way that the TCO (Total Cost of Ownership) is the only number that matters.

What to Compare, as of January 2025:

• Material Cost: Get quotes for the specific grade you need, not a generic “polycarbonate” from a distributor. Ask for the price delta to the generic grade. Covestro resins often carry a 15-25% premium over commodity PC (based on industry averages, verify with your supplier).
• Processing Cost: Does the material need special drying? Higher melt temperature? Slower cycle time? A material that is cheaper per pound but slower to process is often a net loss.
• Lifetime Value: This is the big one. A standard polycarbonate might be cheaper, but if it fails in your application because of hydrolysis (unfortunately, a common issue) after 18 months, the re-manufacturing and warranty costs will bury you. Covestro's hydrolysis-resistant grades are more expensive upfront, but you only need to buy the part once.
• Minimum Order Quantities (MOQs): Specialty grades often have higher MOQs. If you only need a few hundred pounds for a pilot run, you might end up buying a full pallet (which, honestly, hurts your cash flow).

Checkpoint: Have you calculated a simple TCO over a 1-year and a 3-year horizon? I saved $8,400 annually on a project by switching from a premium initial grade to a slightly less exotic one that still met the specs—after analyzing the processing costs. The premium grade was 'better', but it wasn't 'needed'.

A Necessary Detour: Is Silicone Made of Plastic?

I see this question a lot in forums, and it's a high-volume search query. It's relevant because someone searching for “Covestro products” might be confusing material types. Let me clarify this once.

No, silicone is not a plastic. The confusion is understandable. They are both polymers. But the chemical backbone makes all the difference:

• Plastics (like Covestro's polycarbonate and polyurethane) have a backbone of carbon-carbon bonds.
• Silicone has a backbone of alternating silicon and oxygen atoms.

This is a classic case of causation reversal. People think silicone is plastic because they are both polymer materials used in similar applications (seals, medical tubing). The reality is that the applications overlap, but the chemistry and performance properties (temperature resistance, inherent flexibility) are fundamentally different. You don't buy silicone from Covestro; Covestro makes high-performance plastics. If you need silicone, you need a different supplier. Knowing the boundary is part of being a smart buyer.

Common Pitfalls to Avoid

I've made these mistakes. Don't repeat them.

• The ‘Free Setup’ Trap: A molder told me they would waive the tooling modification fee (saving about $2,500) if I picked their standard processing resin. The standard resin was a grade that wasn't hydrolysis-resistant (surprise, surprise). Three months after launch, parts were cracking in the field. The cost to re-manufacture was over $40,000. The 'free setup' cost us dearly.
• Focusing only on the PPAP: The initial production part approval process (PPAP) is just the start. The real test is consistency over 100,000 parts. A Covestro-grade material typically offers tighter process control because of better batch-to-batch consistency (that's the premium you pay for, and it's usually worth it).
• Assuming “Bio-based” Means “Biodegradable”: Covestro's bio-based TPU is made from renewable resources. That's great for carbon footprint reduction. It does not mean it composts in 90 days. Set the right expectations for your sustainability reports (not that anyone reads them carefully, but auditors do).