If you're like me—an office administrator or procurement person responsible for ordering specialty chemicals and materials—you probably didn't study polymer chemistry. But here we are.
I've been handling purchasing for about 5 years now, managing around $50,000 annually across maybe 8 different vendors for my company. When I took over in 2020, the first thing I noticed was the mess of confusion around specifying the right organic silicone product. Every vendor had their own codes, everyone assumed I knew the difference between a rubber and an elastomer, and half the time I just ordered whatever the last person had ordered.
That approach works until someone asks, "Why did we pay for this grade when a lower Shore hardness would have been fine?"
This checklist is for anyone who has to order Shin-Etsu silicones (or similar organic silicone products) but isn't a chemist. Follow these 5 steps, and you'll get the right spec—and look good to your internal stakeholders.
Step 1: Verify the Application (Not Just the Product Name)
This sounds painfully obvious, but it's where most mistakes happen. Don't just ask "which product?"—ask "what is it for?"
I've learned that Shin-Etsu makes vastly different products that share similar names. For example:
- Silicone grease for automotive connectors (like the famous Honda Shin-Etsu silicone grease used for door seals and window channels) is a totally different beast from
- Shin-Etsu silicone used in medical-grade or breast silicone implants, which is a high-purity elastomer, or from
- Shin-Etsu silicones used in semiconductor manufacturing, which are ultra-high-purity polymer precursors
One time, a colleague asked for "Shin-Etsu silicone grease", and I almost ordered the automotive dielectric grease. Turns out they needed it for a high-temperature oven gasket application—completely different specs. The automotive grease would have melted.
Before you look at any datasheet, write down: What is the material touching? What temperature? What pressure? Is it moving or static? Don't assume the name tells you enough.
Step 2: Match the Product to the Standard Spec Sheet
Once you know the application, you need to decode the product specification. This was the hardest part for me initially. Shin-Etsu catalogs are detailed, but they use specific metrics.
Here are the key parameters I now check every time:
- Viscosity (for fluids and greases): Measured in cSt (centistokes) or Pa·s. Not to be confused with density—two different things. For greases, the NLGI grade tells you thickness.
- Shore Hardness (for rubbers and elastomers): Look for Shore A or Shore 00. If you just see "Shore X", it's ambiguous. For soft gaskets, you want lower numbers; for rigid parts, higher numbers.
- Tensile Strength and Elongation (for elastomers): Especially important if the part stretches or experiences stress. Higher tensile strength means it can pull more before breaking.
- Temperature Range: Don't assume. Even though organic silicones are known for heat resistance, not every grade performs at 200°C (392°F) continuously. Check the continuous-use range, not the peak.
I also check whether the material is a polymer or a monomer. This tripped me up early on. Someone asked "Is PTFE a polymer?"—yes, it is—but they actually needed a silicone-based polymer additive for a compounding process, not PTFE. Two different chemistries. Shin-Etsu's additive line is not PTFE at all. Make sure the rep knows what family you're working with.
A quick note: Many Shin-Etsu greases use a logo or code printed on the packaging. If the request says "logo PP" or similar, don't guess—ask for the full product number. That code could mean something specific to their internal system, not the standard catalog.
Step 3: Confirm Compatibility and Regulatory Requirements
This step is where you look like a hero to your internal customers—or the opposite if you skip it.
Check if the product needs to meet any of these:
- FDA or NSF compliance (for food contact or potable water applications)
- UL or flammability ratings (for electronics or automotive interior use)
- REACH or RoHS compliance (for European or regulatory markets)
- Specific OEM approvals (many Japanese automakers specify Shin-Etsu greases for certain parts—verify the exact part number)
I don't have hard data on what percentage of orders get rejected for compliance issues, but based on my experience, I'd say it's probably around 10-15% of cases where someone ordered the wrong grade. That wasted time and money. Now I always confirm compliance before placing the PO.
Step 4: Order the Right Packaging and Quantity
This sounds mundane, but I've seen more mistakes here than you'd believe. Shin-Etsu organic silicone products come in:
- Small tubes (e.g., 100g tubes of grease)
- Cartridges/caulking tubes (for sealants)
- Pails or drums (for bulk fluids or raw polymer)
- Sheet form or pre-cut shapes (for elastomers)
Don't assume the smallest container is the cheapest per unit. It usually isn't. But also don't order a 5-gallon pail if the application uses 10 ml per year—it'll expire or get contaminated before it's used.
I wish I had tracked the cost of wasted material more carefully—probably $2,000–3,000 over 5 years just from ordering the wrong package size. What I can say anecdotally is that asking "how much do you use per month?" before ordering has saved us real money.
Step 5: Verify the Supplier and Lead Time
Shin-Etsu is a global brand with authorized distributors. Not all sources are legitimate. Counterfeit or relabeled product is a real risk for high-demand items like the Honda Shin-Etsu grease or specialty semiconductor materials.
Here's my checklist for this step:
- Does the supplier show up on Shin-Etsu's official distributor list?
- Can they provide a Certificate of Analysis (COA) matching the lot number?
- What's the lead time? Expect 4–8 weeks for specialty materials, 1–2 weeks for common items.
- Can they provide an invoice that meets your accounting team's standards? This is a real issue for me—I've had expenses rejected because a small distributor only gave handwritten receipts.
From the outside, it looks like you just buy from whoever has the cheapest price. The reality: a lower price often means a shorter warranty or less reliable supply chain. I'd rather pay 10% more to a confirmed distributor than gamble on an unknown vendor for critical material.
Common Mistakes to Avoid
Let me save you some pain I've felt personally:
- Don't assume "silicone" is one thing. It's a whole family. Shin-Etsu makes products from liquid silicone rubber (LSR) to high-consistency rubber (HCR) to RTV sealants. They are not interchangeable.
- Don't skip the Shore hardness check. A part that feels too flexible or too rigid is often the result of ordering the wrong durometer.
- Don't ignore storage conditions. Certain Shin-Etsu products (especially catalytic or moisture-cure ones) have short shelf lives. Check the production date and shelf life before accepting.
- Don't believe every online review. I've seen glowing reviews for "Honda Shin-Etsu silicone grease" for door seals, but that same product is not suitable for electrical connectors. Make sure the review matches your application.
It's tempting to think you can just copy what someone else ordered last time. But applications change, regulations update, and new products get introduced. Taking 20 minutes to run through this checklist will save you days of returns, complaints, and explaining to your boss why we have 4 gallons of the wrong grease.
An informed buyer asks better questions and gets faster answers. That's the goal.