A supplier sends you a beautiful terpene sample. The aroma is spot on, the price works, and your product team is ready to move. Then your QA lead asks a simple question: where’s the paperwork? Suddenly the emails go quiet, and what arrives is a single PDF that lists a few compound percentages and not much else.
That gap is where a lot of brands get burned. If you buy terpenes for food, beverage, personal care, vape, or wellness products, three documents should show up together, every time, without you having to chase them. Those are the COA, SDS, and TDS. Each one answers a different question, and together they tell you whether a supplier actually knows what they’re selling you. Here’s how to read all three and what should make you walk away.
The three documents at a glance
Before we go deep on each one, here’s the short version. A complete terpene documentation pack has three parts, and each covers a distinct job.
| Document | What it covers | Why it matters | Red flags |
|---|---|---|---|
| COA (Certificate of Analysis) | Actual composition of the specific batch: compound breakdown by GC-MS, purity, contaminant screening, batch or lot number | Proves what’s really in the bottle you received, not what the product is supposed to be in theory | No batch number, aroma description instead of analysis, old or missing test date, no lab named |
| SDS (Safety Data Sheet) | Hazards, safe handling, storage, transport classification, first aid, spill response | Required for worker safety, shipping, and regulatory compliance in most regions | Generic template with blank fields, no revision date, no emergency contact, wrong product name |
| TDS (Technical Data Sheet) | Physical properties: appearance, viscosity, solubility, density, flash point, recommended usage rates | Tells your formulators how to actually work with the material and dose it correctly | Vague or missing flash point, no solubility guidance, no usage recommendations, marketing copy instead of specs |
Now let’s break each one down so you know exactly what you’re looking at.
What is a COA and why does it matter?
A Certificate of Analysis is a batch-specific lab report that confirms what a material actually contains. It’s the single most important document in the pack, because it describes the real thing you received rather than a general product description.
For terpenes, a good COA usually leans on gas chromatography–mass spectrometry (GC-MS). This is the analytical method that separates a blend into its individual components and identifies them. The result is a breakdown showing which terpenes are present and at what percentage, so you can see whether that limonene-forward profile really is limonene-forward or whether it’s been quietly padded out with cheaper carriers.
A serious COA typically includes:
- A batch or lot number that matches the label on your drum, jug, or bottle
- The compound breakdown, usually as an area percentage or concentration
- Purity figures and, where relevant, contaminant screening (things like residual solvents or heavy metals, depending on the product and its intended use)
- The date of analysis and the name of the lab or analyst who ran it
- The specific method used, such as GC-MS
The batch number is the part people skip past, and it’s the part that matters most. Without it, the COA isn’t tied to anything. It could describe a different production run from six months ago. During an audit, a COA that can’t be traced back to a physical lot is close to useless, because traceability is the whole point.
What is an SDS and why does it matter?
The Safety Data Sheet exists to keep the people handling the material safe and to keep your shipping and storage legal. It’s the document your warehouse team, your logistics partner, and your compliance officer will each want for different reasons.
An SDS follows a standardised 16-section format used internationally, so once your team learns the layout they can read any supplier’s sheet quickly. The sections you’ll reference most often cover hazard identification, first-aid measures, firefighting measures, accidental release (spill) procedures, handling and storage, exposure controls, physical and chemical properties, and transport information.
Why does this matter beyond ticking a box? A few reasons. Some terpenes are flammable, and your storage setup needs to reflect that. Transport classification affects how the material can legally ship, which is why the section on transport information isn’t optional. And if there’s a spill or an exposure incident on your floor, the first-aid and release sections are what your team follows in the moment.
A properly maintained SDS carries a revision date and version number, names the substance correctly, and lists an emergency contact. If you get a sheet with blank hazard fields or a product name that doesn’t match what you ordered, that’s a supplier who pulled a generic template and never filled it in. Treat that as a warning, not a formality.
What is a TDS and why does it matter?
If the COA tells you what’s in the bottle and the SDS tells you how to handle it safely, the Technical Data Sheet tells your formulators how to actually use it. It’s the practical, workbench-level document, and it’s the one that quietly saves you weeks of trial and error.
A TDS describes the material’s physical and functional properties. Expect to see:
- Appearance and colour, so you know what a normal batch looks like
- Viscosity and density, which affect pumping, dosing, and mixing
- Solubility, telling you whether the material plays nicely with water, oil, or ethanol systems
- Flash point, which matters for both safety and processing
- Recommended usage rates, giving your team a sensible starting dose rather than a blind guess
Solubility is where a lot of formulation projects live or die. A terpene blend that’s gorgeous in an oil base can turn cloudy or separate in a water-based beverage, and the TDS is where you catch that before you’ve wasted a production run. Flash point matters too, because it feeds into how you process and store the material safely, connecting the TDS back to the SDS.
Good suppliers treat the TDS as a real engineering document. The ones behind Entour’s custom formulation work, for example, come out of a lab background rooted in The Werc Shop and Dr. Jeff Raber’s approach to terpene science, and that shows up in how thoroughly the technical properties get documented rather than left to guesswork.
What a complete documentation pack looks like
Here’s a quick gut check. When you request documentation for a terpene product, a serious supplier sends all three files together, and each one is specific to the product you asked about. You shouldn’t have to ask twice, and you shouldn’t have to explain what an SDS is.
A complete pack looks like this:
- A COA tied to a batch number, with a GC-MS breakdown, a recent analysis date, and a named lab or analyst
- An SDS in the standard 16-section format, with a revision date, correct product naming, and an emergency contact
- A TDS listing physical properties and real usage guidance, matched to the same product
The tell is consistency across all three. The product name, the material, and the intent should line up from one document to the next. When a supplier’s own paperwork contradicts itself, that’s not a paperwork problem. It’s a sign the process behind it isn’t tight.
How to read the docs like an auditor
You don’t need to be a chemist to spot a weak documentation pack. You need a short checklist and about ten minutes. Run through these questions in order.
- Does the COA have a batch number, and does it match my label? If not, stop here. Nothing else on the COA can be trusted to describe your actual material.
- How recent are the dates? A COA from years ago attached to a current shipment is a mismatch. Analysis should reflect the batch in front of you.
- Is there a real analysis, or just an aroma description? “Fresh citrus with a pine finish” is marketing. A GC-MS breakdown is analysis. You need the second one.
- Is the SDS filled in, not blank? Open it and scan the hazard and handling sections. Empty fields mean nobody completed it.
- Does the TDS give usable specs? Look for flash point, solubility, and usage rates. If it reads like a sales page, it isn’t a TDS.
- Do all three agree with each other? Same product, same material, no contradictions.
Do this once and you’ll never look at a supplier’s paperwork the same way again. The good ones make this easy. The weak ones make you work for every answer.
Red flags that should stop a purchase
Some issues are minor and worth a quick clarifying email. Others should end the conversation. Here are the ones that should genuinely stop a purchase or an audit sign-off.
- Missing documents entirely. If a supplier can send an SDS but has “never needed” a COA, that tells you they aren’t testing batches. Walk away.
- No batch or lot number on the COA. Untraceable analysis is not analysis you can defend in an audit.
- Aroma-only “analysis.” A sensory description dressed up as a certificate is one of the most common dodges. It sounds technical and proves nothing.
- Stale or missing dates. No revision date on the SDS, no analysis date on the COA, or dates that don’t match the shipment.
- Generic, templated safety sheets. Blank fields, wrong product names, or an SDS that clearly belongs to a different material.
- Documents that contradict each other. When the COA, SDS, and TDS describe slightly different products, the process behind them is broken.
Why documentation is the compliance backbone
Here’s why all of this is worth the effort. When an auditor, a customer, or a regulator asks you to prove what’s in your product and that you handled it safely, your answer is only as strong as your supplier’s paperwork. You can’t produce traceability you were never given.
A complete COA, SDS, and TDS pack, tied to batch numbers and kept on file, is what lets you respond to a recall, a customer complaint, or an audit without scrambling. It’s also what protects you when something goes wrong upstream, because you can trace the issue back to a specific lot rather than guessing. In regulated categories, that traceability isn’t a nice-to-have. It’s the difference between a manageable problem and a serious one.
This is why the serious suppliers provide all three by default, before you ask. It signals a real quality system running behind the product: GC-MS testing, cGMP-minded processes, and a document trail built for scrutiny rather than assembled in a panic when a buyer requests it.
What to do next
The next time you evaluate a terpene supplier, make the documentation pack part of the very first conversation, not an afterthought. Ask for the COA, SDS, and TDS together, tied to a specific batch, and run them through the auditor checklist above. How a supplier responds to that request tells you almost everything about how they’ll behave once you’re a customer.
If you want to see what a complete, batch-traceable pack should look like, you can request a sample evaluation and get the full COA, SDS, and TDS set alongside the material, so your QA and procurement teams can pressure-test both the terpenes and the paperwork before you commit. Serious documentation is a small thing to ask for and a very telling thing to receive.
