Dow Corning Silicone: 8 FAQ for Buyers Who’ve Been Burned Before

If you're sourcing Dow Corning silicone for the first time—or the fifth—you probably have the same questions I had. The difference is, I made the mistakes so you don't have to.

I'm a procurement lead handling special silicone and rubber orders for a mid-sized industrial parts supplier. Been at it since 2019. And I've personally made—and documented—28 significant sourcing mistakes totalling roughly $20,000 in wasted budget. That includes the time I ordered 5,000 silicone cups with the wrong durometer. Straight to trash. $3,200.

Now I maintain our team's pre-order checklist to prevent others from repeating my errors. Here are the answers I wish I'd had from day one.

1. Are Dow Corning and DOW the same company today?

Short answer: Yes, but the branding shifted. Dow Corning was a joint venture between Dow Chemical and Corning. In 2016, Dow bought out Corning's stake. Now it's the Dow Silicones business unit under Dow Inc.

What this means for you as a buyer:

• Many product names haven't changed (like Dow Corning 732 or 734 sealant)
• The old logo is still visible on legacy packaging until inventory cycles out
• Your distributor can still get the same formulations—just verify the SKU hasn't changed

2. Where to buy Dow Corning silicone—and where not to

The question everyone asks: "Where can I buy this?" The question they should ask: "Who's an authorized distributor?"

Here's my rule after the 2022 fiasco where I bought 732 sealant from a third-party reseller on a marketplace platform. The product arrived. Looked fine. It was counterfeit.

Checking the batch number with Dow revealed it didn't exist in their system. $890 down the drain plus a 2-week delay.

Verified sources:

• Dow's official distributor finder on their website
• Major industrial suppliers like Grainger, McMaster-Carr, and MSC Industrial (check they source from Dow directly)
• Specialty rubber/plastics distributors in your region

Oh, and I should add: don't rely on price as a quality signal. Counterfeiters know what to charge. The fake 732 was priced within $5 of the real stuff.

3. Dow Corning 732 sealant—universal solution or just versatile?

It's versatile. It's not universal. I learned this the hard way after bonding polycarbonate panels with it. Day one: perfect seal. Day 30: cracks appeared. Turns out 732's acetic acid cure can stress-sensitive plastics.

Dow Corning 732 is a one-part, acetoxy-cure silicone sealant. Great for:

• General purpose sealing (glass, ceramics, non-oily wood)
• Bonding metals (aluminum, steel, stainless)
• Gasketing non-critical applications
• Temp range: -67°F to 400°F (-55°C to 204°C)

But: avoid it on polycarbonate, acrylic, ABS, or any plastic prone to stress cracking. For those, use Dow Corning 734 or 795 (neutral cure) instead.

Most buyers focus on the price difference. The real missed factor is application compatibility.

4. Can I use a natural rubber strip instead of silicone gaskets?

I get this question a lot. Natural rubber is cheaper. Silicone is... not always. The temptation is real.

Here's the breakdown based on what I've seen fail and succeed:

When rubber works: dry indoor applications, moderate temps, no ozone exposure.
When silicone is mandatory: outdoor exposure, extreme temps, food contact, or where you need reliable long-term seal.

The mistake I made in 2021? I assumed "same durometer, same performance" when substituting rubber for silicone on an outdoor electrical enclosure. The rubber failed in 8 months. Replacing it cost $2,400 in labor.

5. Silicone cups—what are they actually used for?

Silicone cups sound simple. They aren't. I've seen buyers order the wrong type more times than I can count.

The three main categories:

• LED/Lighting lens covers: optically clear silicone, high heat resistance
• Vacuum suction cups: softer durometer (50-60 Shore A), high flexibility
• Membrane/button cups: typically liquid silicone rubber (LSR), precise thickness

The #1 pitfall: hard-to-soft mismatches. I once ordered 70A durometer cups for a vacuum pick-and-place system. The spec sheet said 70A. What I missed was the manufacturer's recommendation was actually 50A. 70A was too stiff to form a seal.

Bottom line: always verify the durometer AND the intended application context with your supplier.

6. TPE vs silicone sex dolls—why the debate matters for material buyers

This question comes up in our industry more than you'd expect. Not because we make dolls—but because the TPE vs silicone comparison is relevant for any soft-touch application: medical devices, wearable tech, prosthetics, food-contact interfaces.

From a sourcing perspective, here's the real difference:

• TPE (Thermoplastic Elastomer): cheaper to produce ($2-5/lb), easier to color, can be injection molded faster. But softer grades (<10 Shore A) can exude oil over time. Surface feels "tacky" to some.
• Silicone (LSR or HCR): more expensive ($8-15/lb for medical grade), requires vulcanization, longer cycle times. But zero oil migration, biocompatible, can be sterilized, doesn't degrade over 10+ years.

What was best practice in 2020: choose TPE if cost is primary and lifespan is short. What changed in 2025: silicone formulations have improved moldability while TPE regulatory scrutiny for long-term wear has increased. The fundamentals haven't changed—silicone is still premium—but the calculation now favours silicone more than it did five years ago.

If you're sourcing material for skin-contact products that need to last >3 years, silicone is the no-brainer. I learned this after a client rejected a TPE prototype because it stained after 2 months.

7. Why does silicone cost more—and is it worth it?

Short version: yes—if the application demands it.

Let me put some numbers on this. Based on publicly listed prices from major industrial suppliers (March 2025; verify current rates):

• Silicone sheet (60A, 1/8" thick): ~$45-65 per sq ft
• Natural rubber sheet (60A, 1/8" thick): ~$12-20 per sq ft
• Standard EPDM rubber: ~$8-15 per sq ft

The sticker shock is real. But replacement cost matters more. I've tracked a 5-year total cost on two equipment lines using silicone vs rubber gaskets. The silicone line had zero gasket failures. The rubber line had 4 replacements. The silicone line cost 40% more upfront but was 15% cheaper over 5 years when factoring in downtime.

Is silicone always worth it? No. For a $20 seasonal outdoor sign printed in 1,000 units, rubber is fine. For the sealing system on a $50,000 machine that runs 24/7? Silicone is the only answer.

8. What's the biggest mistake you see buyers make with Dow Corning products?

One answer: assuming the data sheet tells the whole story.

In September 2023, I sourced a Dow Corning dispersion for a custom coating application. The datasheet listed viscosity, solids content, and cure schedule. Everything matched. I ordered 25 gallons. $1,800. The coating worked fine in lab tests.

What the data sheet didn't tell me: the product had a 6-month shelf life and needed cold storage. My warehouse kept it at ambient temps for 3 months. The result? Batch ruined. $1,800 wasted plus a 3-week production delay while we reordered.

Three things to always verify that aren't on the data sheet:

1. Shelf life and storage requirements—some Dow silicones have short windows
2. Batch-to-batch consistency—ask for certificate of analysis (CoA) for each batch
3. Application-specific documentation—like UL ratings or food-grade certifications

Most buyers focus on price, viscosity, and cure time. They miss the logistical details that kill the whole order. That's the difference between saving $200 and losing $2,000.

Prices referenced are based on publicly listed rates from major industrial distributors as of March 2025. Actual pricing varies by volume, region, and distributor. Always verify current rates with your supplier.