When Should You Replace a Lab Coat? The Safety Checklist

A lab coat isn't a keepsake — it's PPE, and PPE has a working life. Laboratory safety programs share broadly consistent criteria for when a coat is done, and they're worth knowing before you trust a tired coat. Here's the checklist.

The Four Retirement Criteria

1. Tears, holes, or open seams. Any breach that exposes skin or clothing is an automatic replacement — the coat's entire job is to be an unbroken barrier. A torn pocket is repairable; a torn seam at the shoulder or a hole anywhere is not.

2. Chemical staining you can't remove. A persistent stain after proper treatment (see our stain removal guide) can mean the substance has penetrated the fabric, not just marked it. Safety programs flag persistent chemical staining as a replacement trigger because the contamination may not be visible.

3. Damage to the fabric itself. Run your hand over the coat. Stiff, thin, brittle or shiny patches — often the legacy of a concentrated acid or solvent splash — mean the fibre structure has been altered. That area no longer protects at full spec. Test the press studs too: corroded or loose studs mean the coat can no longer be reliably closed.

4. Loss of water repellency. A healthy coat makes water bead and roll off; a spent coat absorbs instantly. Repellency fading after many washes is normal; gone entirely, the coat is a costume.

How Long Does a Lab Coat Actually Last?

There's no fixed expiry — it depends entirely on what the coat goes through. The honest rules of thumb:

• A student's coat in teaching labs, washed regularly: commonly lasts a full degree — but inspect it against the checklist each semester
• A coat with a chemical exposure history: assessed immediately, replaced on any of the four criteria above
• Coats in institutional rotation: labs commonly retire or replace coats on condition, not age — which is what the four criteria are for

The Inspection (Two Minutes, Start of Semester)

1. Hold the coat up to the light — look for thin spots and pinholes
2. Check every seam at the shoulders, sides and cuffs
3. Fasten all five press studs — they should grip firmly
4. Check the cuffs: elastic should still hold the wrist snugly
5. Drop a few water drops on the front: bead or soak?

Anything failing = replace. Everything passing = good for another semester.

Why Replacing Is Cheaper Than Pushing It

A white lab coat is $24 ex GST ($27 navy). The alternative costs are: a coat that fails during the one splash that matters, contaminated clothing underneath it, and in a school or workplace context, the compliance question of why visibly spent PPE was still in service. Keep a spare in the lab cupboard — class sets and workplace stock get the same replacement logic, and bulk replacements ship free over $100.

Replace Yours

Shop lab coats — white $24, navy $27, elastic or traditional cuffs, XXS to 3XL. In-stock coats dispatch within 24 hours. Questions about whether a coat's condition is acceptable? Contact us.