Checking the Revision Date on an SDS Before You File

I keep a folder of SDS files going back years for ingredients I've used across different clients, and every so often I open one to double-check a CAS number and notice the revision date sitting quietly at the top: 2019. Sometimes older. That date isn't decoration. It's telling you how stale the information underneath it might be.

An SDS doesn't come with a hard expiration date the way food does, but treating it as permanently valid is a mistake that catches people during filing review more often than you'd think.

Why the date actually matters

Suppliers update SDS documents when something changes: a reformulated blend, a new hazard classification, an updated composition percentage, a change in manufacturing source. Section 3, the composition section, is exactly the part of the document you rely on for filing. If that section reflects a 2019 formula and the supplier quietly adjusted their blend ratio in 2022, you're filing with numbers that no longer describe what's actually in the drum you received last week.

This is more common with blended or proprietary ingredients than with single, well-defined chemicals. A supplier might tweak a preservative system's ratio for cost or performance reasons and consider it a minor internal change, not worth a big announcement, while your filing still assumes the old ratio.

How old is too old

There's no universal rule here, but a few practical guidelines:

• Under 2 years: generally fine, though it's still worth a quick check if the ingredient is a proprietary blend rather than a raw single chemical.
• 2 to 4 years: worth a courtesy email to the supplier confirming nothing has changed, especially for blends, extracts, or anything with variable sourcing.
• Over 5 years: ask for a current version before you rely on it for a new filing. Formulations, suppliers, and even regulatory classification systems shift over that span.
• No date at all: treat this as a red flag on its own. A properly maintained SDS should have a revision date somewhere in section 1 or near the header.

What actually changes between revisions

It helps to know what you're watching for when you compare an old SDS against a new one:

What might change	Where to check	Why it matters for filing
Composition percentages	Section 3	Directly affects the concentration you report
INCI or chemical name	Section 3 or 1	Could mean you've been filing under the wrong name
CAS number	Section 3	Some substances have multiple valid CAS numbers, but a change here needs verifying
Hazard classification	Section 2	Doesn't change your cosmetic filing directly but signals a real reformulation happened
Manufacturer or source	Section 1	A new source may mean a different impurity profile even at the same nominal composition

The email that gets you an updated copy

Most suppliers will send a current SDS without pushback if you just ask plainly:

"We're updating our records ahead of a regulatory filing and noticed our SDS on file for [product name] is dated [year]. Could you confirm whether the composition has changed since then, and send the most current version if so?"

This does two things at once. It gets you the document, and it puts on record that you asked, which matters if a regulator ever questions your due diligence later.

When a supplier can't produce anything current

Occasionally you'll deal with a smaller supplier who genuinely hasn't updated their SDS in a long time and doesn't seem inclined to. That's a judgment call. For a low-risk, well-characterized ingredient like a common carrier oil, an old but accurate SDS might be tolerable. For a preservative blend, a fragrance mixture, or anything with an active ingredient at a controlled concentration, I'd push harder, or consider switching suppliers if they won't engage.

Building the habit

The easiest fix is to check revision dates whenever you reorder, not just when you're about to file. Add it to whatever reorder checklist you already run, right next to checking stock levels. It takes ten seconds to glance at a date and saves you from filing on data that quietly stopped being true a while ago.

If you're pulling together a batch of SDS files to prep a new notification, Cosmetic Comply's ingredient matching step will flag when something looks inconsistent with expected composition, but it can't tell you the document in front of it is outdated if the numbers still look plausible. That check still lives with you and whoever manages your supplier files.