Here's my short answer: Dow Corning products are usually the cheaper option once you measure total cost of ownership instead of unit price. I've been a procurement manager at a 140-person plastics and rubber parts manufacturer for 8 years, managing about $2.1M in annual material spend. In 2023, a cheap structural sealant passed the quote stage but failed our adhesion test. The 15% price saving turned into a 23% total cost overrun after rework, testing, and a 3-day schedule slip. That experience is why every purchase order in my office now has a TCO column.
Why I don't trust unit price
It took around 150 purchase orders and one very public mistake before I learned this. I accepted a low quote for a silicone-coated fabric without running our standard peel test. It looked fine in the sample photo, but the coating separated during assembly and we ate $1,200 in credits and labor. They warned me to test first. I didn't listen. Now I do.
The formula I use isn't fancy: total cost = (unit price × quantity) + ordering and handling + rework and rejection risk + inspection time + worst-case downtime. Put that in a spreadsheet and suddenly many "expensive" materials start looking reasonable.
Per FTC guidance on marketing claims (ftc.gov), a statement like "just as good as silicone" needs substantiation. Same rule should apply in procurement. If a vendor can't prove it, their quote is a guess with a price tag.
When I compare quotes now, I ask every vendor the same four questions: What happens if it fails? What is the replacement process? What test data do you have? What storage and shelf-life assumptions matter? The answers tell me more than the quote itself.
Three examples from my files
Structural sealant: not the place to park savings
One glazing subcontractor requested Dow Corning 995 silicone structural sealant for a curtain wall repair. The project manager swapped it for a lower-priced "equivalent" without telling us. Same color, same consistency, no test data. We ran a simple adhesion check and the bead peeled off at less than half the force we needed. The rework cost around $2,300, plus $850 for an independent lab report, plus two site visits. Total: $3,150 on a project that saved maybe $900 in material. So glad we caught it in-house. If it had gone to the job site, we'd be talking about warranty money and a lost client.
I have mixed feelings about brand-name specs, but now if a spec says Dow Corning 995, we ask for test data before approving a substitution.
Hydraulic hose logo: the hidden cost of a peeling label
A marketing request landed on my desk: add a hydraulic hose logo to a new line of assemblies. The cheapest label supplier quoted a thin film, and production applied it before anyone tested it. After 600 flex cycles, the logos started lifting. We had to re-label 80 hoses, which cost more in labor than the label quote difference. A silicone-based ink system from Dow Corning was not the lowest initial quote, but it survived flexing, hot oil soak, and the pressure test. A peeling logo makes the whole hose look bad, and customers notice.
The Grinch silicone mold that wasn't a bargain
Someone in planning asked for a Grinch silicone mold for a holiday promotion. They ordered a cheap finished mold from an overseas seller. It tore after 12 pulls. We calculated that making our own mold with Dow Corning liquid silicone rubber would have cost about $80 more in material and a few hours of mixing. It ended up making 200+ parts and we still have the master. Real talk: if you're making one craft piece, buy the cheap mold and go. But if you need repeatable parts, a cheap mold is usually the most expensive mold you'll ever buy.
How to clean thermoplastic elastomer (without creating a rework)
The question I hear most often is how to clean thermoplastic elastomer. The answer is simpler than most people think: warm water, mild soap, and a soft cloth for normal dirt. For grease or oil, 70% isopropyl alcohol on a lint-free cloth is my go-to. What I avoid: acetone, brake cleaner, gasoline, and heavy-duty degreasers. Those solvents can swell or micro-crack TPE, and you may not see the damage until the part is out in the field.
That's not just a maintenance tip. It's a cost issue. A batch of TPE parts ruined by the wrong cleaning wipe is a rework line on the same spreadsheet as the sealant failure.
If you're in a mass production environment, put cleaning instructions on the work cell. We laminate them near every station. It sounds like overkill until you watch a new operator grab the wrong solvent from a mislabeled spray bottle.
The boundary conditions
Before you read this as "always buy Dow Corning," let me stop you. I'm a procurement guy, not a sales guy. There are cases where a premium is hard to justify:
- One-off projects where you can field-test the cheaper material first.
- Non-critical parts that are cheap to replace and unlikely to cause harm.
- Applications where the structural performance of Dow Corning 995 isn't actually required.
Temperature ranges matter too. Dow Corning products have published service limits, and a sealant or elastomer is only as good as its match to your actual environment. If you exceed the limits, no brand will save you.
What I recommend is making the spec a test, not a preference. Ask for a sample. Run a quick adhesion test. Bend the part. Soak a TPE scrap in isopropanol and measure it after 24 hours. Data beats opinions.
Here's something vendors won't always tell you: distributors often have flexibility on packaging and delivery terms. Asking how to reduce handling cost usually works better than asking for a price cut.
Bottom line
I'm not here to sell Dow Corning products. I'm here to argue that the question "which costs less?" is incomplete. Add failure rate, time, and trust to the calculation, and the picture often flips. I'm not 100% sure today's exact price gaps are the same as the ones we saw in 2023—commodity silicone prices move around. Verify current quotes, as of early 2025. But the logic doesn't move. The cheapest invoice is not the lowest cost. The lowest total cost is the one that survives the real world.