Dow Corning Products vs. TPE: Silicone and Thermoplastic Elastomer Comparison from a Buyer Who's Ordered Both

I'm the office administrator for a 95-person engineering services company. That means I buy everything from printer paper to replacement gaskets, and I've been managing those orders since 2020—roughly $340,000 a year across 12 vendors. Not a huge operation, but big enough to learn what happens when you guess instead of verify.

This article compares two flexible materials you'll probably order at some point: silicone, specifically Dow Corning products, and thermoplastic elastomer (TPE). The goal is not to crown a winner. It's to help you ask the right questions before you spend money.

What We're Comparing and Why

Silicone and TPE both feel soft and rubbery. Both are used for gaskets, seals, tubing, grips, and custom molded parts. But the chemistry is different, and that difference shows up in heat tolerance, cleaning, bonding, and cost.

I'll use examples from actual orders: a glass partition project that required Dow Corning 995 silicone structural sealant, a holiday cookie mold, and a TPE cleaning near-miss that happened because someone didn't check the instructions.

Here are the dimensions I'll compare:

• Temperature tolerance
• Cleanability and chemical resistance
• Bonding and sealing
• Durability and surface marking
• Cost and lead time

Why these five? Because these are the five things that have made me reorder, refund, or apologize to an internal stakeholder.

1. Temperature Tolerance: Silicone Wins, But Do You Need It?

If you hold a silicone part in one hand and a TPE part in the other, they feel similar. Heat separates them.

General-purpose silicone can handle continuous temperatures from roughly -40°C to 200°C, depending on the grade. Many TPE grades are fine from about -20°C to 100°C, but the upper limit depends on the specific formulation. Not ideal if the part sits near a motor or in direct sun.

Most of our gaskets sit in climate-controlled offices. Did we need silicone's heat resistance for those? No. But we have a heat-seal machine in the mailroom, and the original silicone gasket held up while a cheaper TPE replacement warped after one afternoon of heavy use. That was in 2023. The TPE sample sat in a drawer for six months, fine. It failed when it finally got hot.

Not great, not terrible. It was a lesson.

Conclusion: If the part faces heat or cold extremes, choose silicone. If it's indoor and room-temperature, TPE can be the smarter buy. Don't pay for temperature range you don't need.

2. Cleanability: Actually, TPE Is Often Simpler

This is the part that surprised me. Most people assume silicone is easier to clean because it's non-stick. That's mostly true for food-contact items like baking molds. For general industrial parts, TPE is often easier to wipe down.

Silicone has a grippy, tacky texture in some grades. It attracts lint, dust, and fingerprints. TPE can be smoother and more stain-resistant, depending on surface finish.

Case in point: Last December, an HR coordinator asked me to buy a Grinch silicone mold for a holiday baking contest. It was a silicone kitchen product, not an industrial one. It worked beautifully—released cookies without greasing and rinsed clean in under a minute. That's silicone's superpower: release.

Our actual gaskets are different. The silicone gaskets in the break room coffee machine look grimy after a few months because silicone tends to hold onto oils. A TPE gasket, wiped with warm soapy water, looks clean right away.

The tricky part is cleaning TPE without ruining it. That's where prevention beats cure.

How to Clean Thermoplastic Elastomer Without Ruining It

A maintenance tech almost cleaned a TPE gasket with isopropyl alcohol last year. He meant well. Isopropyl can swell or degrade some TPEs. The part would probably have failed later, and we'd have blamed the supplier.

Here's the checklist I keep near our cleaning supplies:

1. Use warm water and a mild dish soap.
2. Wipe with a soft cloth or sponge—no abrasive pads.
3. Rinse thoroughly so soap doesn't leave a film.
4. Pat dry or air dry. No heat dryer.
5. Before using any solvent or degreaser, check the material datasheet or test a hidden area.

Why does this matter? Because the clean step is where most damage happens. Not the actual use. Five minutes of checking a datasheet can save you from ordering a $400 replacement part.

3. Bonding and Sealing: Dow Corning 995 Silicone Structural Sealant

Now to a product I've ordered by name: Dow Corning 995 silicone structural sealant. In some regions it's sold under the DOWSIL brand. This is what our contractor insisted on for a glass partition repair in our lobby.

Per the product information on Dow's website, which I accessed in February 2025, DC 995 is a one-part, neutral-curing structural silicone sealant used for glass and aluminum. The contractor liked it because it bonds well and handles movement. I liked it because it came in a standard cartridge and the cure time was documented.

A sealant and a gasket are not interchangeable. If the gap is irregular, silicone sealant can fill it and form a weather-resistant seal. TPE is a pre-formed part.

That distinction changes procurement. With a gasket, you specify durometer and dimensions. With a structural sealant, you specify adhesion requirements, curing time, and surface preparation. Both require checking before ordering.

Did I second-guess the order? Yes. I hit approve and immediately wondered if the contractor had given me the right product code. The two weeks until the cure test were stressful. Everything worked, but I learned to ask for the data sheet before placing the order, not after.

4. Durability and Surface Marking: A Hydraulic Hose Logo Taught Me About Material Compatibility

Durability isn't only about not breaking. It's also about keeping identification marks readable.

A few years ago, we ordered custom hydraulic hoses with our company logo. The supplier asked: 'Does the hydraulic hose logo need to resist oil, heat, and abrasion?' At first I thought it was a branding question. It's actually a material question.

If a hose cover is silicone, many standard inks don't stick well. If it's TPE, some laser marking and ink systems work, but the specific grade matters. If the logo is molded—like a raised logo on a silicone part—you need a mold cut correctly. You don't print a mold; you machine it into the tool.

For the hoses, we went with a molded logo on a rubber cover. Not because we liked the look, but because it had the best chance of surviving the shop floor. The marking method was a failure-prevention decision, not a design preference.

If you're buying custom flexible parts with logos, ask the supplier which surface marking method they recommend for the material. Don't let a marketing person choose the logo color before an engineer confirms material compatibility.

5. Cost and Lead Time: The One Quote That Changed My Mind

In 2024, I requested quotes for replacement gaskets in a piece of lab equipment. One vendor offered TPE, another silicone. The TPE quote was about 30% lower than the silicone quote. Same dimensions. Same basic durometer. Easy choice, I thought.

Then I checked the equipment's operating temperature. It reaches 80°C at regular intervals. The TPE grade the vendor quoted was rated to 70°C. A 10°C margin. Maybe fine. Or maybe not. I ordered the silicone part and slept better.

The cost difference didn't matter because the TPE part would have been the wrong part. Buying cheap is only cheaper if it doesn't fail.

Lead times were similar—about two weeks. Or rather, closer to three when you count the time the distributor took to answer questions. If you're ordering a Grinch silicone mold or a custom sealant cartridge, lead time depends more on the distributor than the material.

One more thing: the TPE quote didn't include the surface-finish fee. That narrowed the price gap.

Don't assume TPE is always cheaper. In my quotes, prices varied by geometry, tooling, and order volume. Get a quote, not a rule of thumb.

What Should You Order? A Scenarios Guide

• Choose silicone (including Dow Corning products) when: The part faces temperature extremes, needs to release sticky materials, must bond in place as a sealant, or needs long-term flexibility in demanding conditions.
• Choose TPE when: You need a lower-cost, cleanable, recyclable option for indoor room-temperature parts, and the supplier confirms the specific grade handles your environment.
• Ask an engineer when: You're dealing with structural glazing, medical devices, high-pressure hoses, or any application where failure could hurt someone.

Final Thought: The Cheapest Order Is the One You Check First

My experience is based on a few hundred purchase orders across building maintenance, light industrial parts, and the occasional holiday baking contest. If you're sourcing aerospace seals or medical implants, stop reading and call a specialist. I can't speak to those applications.

For everyday buyers, the lesson is consistent: verification beats correction. A 10-minute check of the datasheet, the operating temperature, and the cleaning instructions is the cheapest insurance you'll buy. The order that fails costs you the part, the labor, and your credibility. The order that works—you won't even remember it.