A 5-Step Checklist to Avoid Costly Mistakes When Ordering Dow Corning Silicone Materials

Who Needs This Checklist?

If you're ordering Dow Corning silicone materials—whether it's a silicone compound, dispersion, foam rubber, or even a specialty white resin—and you've ever received something that didn't match what you expected, this checklist is for you.

I've been handling technical material orders for industrial manufacturing since 2018. In my first two years alone, I made six significant mistakes that collectively cost roughly $12,700 in wasted material, rework fees, and delayed production lines. The most painful one? A $3,200 order of Molykote Dow Corning silicone dispersions that arrived with the wrong solids content because I assumed the spec sheet covered it. (Spoiler: it didn't cover the dispersion medium.)

After that, I built a pre-order checklist. It now lives on our team's shared drive, and in the past 18 months we've caught 47 potential errors using it. Most of those would have cost at least a few hundred dollars each—some would have shut down a line for a full day.

Here's the 5-step checklist I wish I'd had from day one.

Step 1: Define All Critical Properties Before You Search

The biggest mistake I made—and still see others make—is starting with a product name or a vague requirement like "high-temp silicone." That's how you end up with a silicone that melts at 180°C when you actually needed 250°C continuous service. (Trust me, I've been there.)

What to do: Write down at minimum the following parameters:

• Durometer (hardness) – Shore A or Shore 00? Typical silicone ranges from 20 A to 80 A, but foam rubber uses a different scale.
• Tensile strength and elongation – Per ASTM D412 or ISO 37.
• Temperature range – Continuous vs. intermittent service.
• Compression set – Essential for gaskets and seals.
• Color – Especially if you need a specific white or translucent resin. "White resin" can mean very different things across silicone grades. I once ordered a "white silicone compound" that came out slightly yellow under UV light. (Ugh.)

Checkpoint: Have you confirmed each property against the manufacturer's technical data sheet? If you're comparing a TPU vs silicone case, note that TPU may have different hardness scales and compression set behavior—don't assume they're interchangeable.

To be fair, most suppliers provide datasheets. The trick is actually reading them before you hit "order."

Step 2: Verify the Exact Product Type – Silicone Foam, Compound, Dispersion, or Resin

This sounds obvious, but I've seen people order silicone foam rubber when they needed solid rubber, or a silicone compound when a dispersion was what the application required. The differences aren't just physical—they affect processing and final performance.

Key distinctions:

• Solid silicone rubber – for molded parts, gaskets, seals.
• Silicone foam rubber – for cushioning, thermal insulation, sealing against air.
• Silicone compound – typically a base material that you then further mix or cure; check whether it's a two-part system.
• Silicone dispersions (like Molykote Dow Corning silicone dispersions) – used for coatings, release agents, or lubricants. The carrier medium (solvent or water) matters a lot.
• White resin – often a masterbatch or a high-purity silicone for optical or medical use. Not the same as standard pigmented silicone.

I learned this the hard way in September 2022. I ordered a silicone dispersion thinking it was a ready-to-use coating. Turned out the dispersion needed an additional crosslinker. $890 worth went straight to the trash because I hadn't checked the cure mechanism. (Which, honestly, was written in the second paragraph of the datasheet—my fault.)

Checkpoint: Match the product form to your intended process: injection molding, extrusion, coating, or potting.

Step 3: Don't Assume “Standard” Means Interchangeable Across Suppliers

Here's where the TPU vs silicone case often gets messy. People compare durometer numbers and think they can substitute one material for another. But silicone and TPU behave completely differently under dynamic load, chemical exposure, and high temperatures.

Even within the Dow Corning portfolio, two products with the same Shore A hardness can have vastly different compression set values. For example, a general-purpose silicone compound might have 30% compression set, while a high-performance grade has less than 15%.

What to do: When evaluating alternatives, create a side-by-side comparison of the specific parameters that matter for your use case. When I compared our initial choice and the alternative side by side—same durometer, different compression set—I finally understood why the original spec had failed after six months in service.

Checkpoint: Have you checked the actual test conditions (ASTM D395 for compression set)? The temperature and duration make a huge difference.

Step 4: Confirm Certifications and Regulatory Compliance

This step is often rushed, and it's where a lot of budget gets wasted. If your application needs FDA food contact, USP Class VI, UL 94 flame rating, or REACH compliance, do not assume that all grades of Dow Corning silicone automatically meet them.

• Many standard silicone compounds do have FDA approval, but check the specific product code.
• For the medical market, you may need a medical-grade dispersion with additional biocompatibility data.
• Flame ratings vary: some silicones are inherently self-extinguishing; others require additives that may change other properties.

In early 2023, I nearly ordered a standard silicone foam rubber for an aerospace application that required FAR 25.853 flammability. I caught it at the last moment because I ran through this checklist. That error would have caused a 3-day production delay while we sourced the correct material. (Thankfully, we kept the checklist.)

Checkpoint: Ask for a copy of the certification or reference the product's official declaration. Per ASTM standards, the manufacturer should provide a certificate of compliance upon request.

Step 5: Order a Small Sample for Validation – Never Skip This

I don't care how similar the datasheets look. Order a small test quantity first. I assumed that a silicone compound with the same durometer and color would process identically to our previous vendor's. The result: the new material had a different viscosity at processing temperature, causing flash in our molds. That mistake affected a 2,400-piece order. Every single piece had the issue. $3,200 worth of raw material + $1,100 in rework + one very stern conversation with my boss.

When you get the sample, test it under your actual process conditions—temperature, pressure, cure time. Not just physical properties in a lab. This is especially critical for silicone dispersions and foam rubber, where the foaming process is sensitive to cure parameters.

Checkpoint: Have you run a pilot run and gotten sign-off from your production team before committing to a full order?

Common Pitfalls & Final Notes

• Over-specifying – Don't ask for higher performance than you need; it drives cost and may reduce processability.
• Under-specifying – Missing one key property (like compression set or heat aging) can lead to field failures.
• Relying on verbal agreements – Always get specs in writing from the supplier.
• Ignoring batch-to-batch variation – For critical applications, request a certificate of analysis with each batch.

5 minutes of verification using this checklist beats 5 days of correction. I'm not 100% sure it'll catch every error, but based on my track record, it has already saved us an estimated $8,000 in potential rework. Give it a shot on your next order of Dow Corning silicone compound, dispersion, or foam rubber—your production line will thank you.