Not all nitrile gloves are the same, and using the wrong grade in the wrong part of your process either wastes money or puts your cultures at risk. Grain bag injection doesn’t need the same glove as a syringe transfer in the flow hood, and mixing bulk substrate doesn’t need either. Here’s how to match the grade to the job.
The three grades at a glance
| Grade | Product | Price | Best for |
|---|---|---|---|
| Surgical | Sterile Surgical Nitrile Gloves (Single Pair) | £3.15 | Flow hood work, syringe making, tissue culture transfers |
| Sterile examination | Sterile Powder-Free Nitrile Gloves | £0.60 / pair, £21.58 box of 50 | Injecting grain bags, handling substrate after sterilisation |
| Medical grade Cat III PPE | Blue Nitrile Gloves, Box of 100 | £11.99 | Mixing substrate, general hand protection |
Surgical grade: for anything that has to stay sterile
Gamma-irradiated and 100% sterile straight out of the individually sealed packet, this is the grade to reach for at the flow hood: syringe making, liquid culture transfers, agar work, tissue transfers. Anywhere your hands are working directly with an open culture, this is the only grade that guarantees you’re not the contamination source. It’s non-powdered, so there’s no residue risk near agar or media, and because each pair comes individually packeted, you open a fresh, sterile pair for each session rather than drawing from a shared box.
It’s the most expensive of the three per pair, and that’s by design — you’re paying for the gamma irradiation and individual sterile packaging, not just glove material.
Sterile examination grade: for handling, not open culture work
The mid grade is also individually packeted and sterile on opening, but it isn’t gamma-irradiated to the surgical standard. This is the right choice for jobs where you want clean hands and reasonable protection but you’re not working inside an open, actively-exposed culture — injecting grain bags with spawn, handling substrate once it’s out of the pressure cooker or autoclave. Available either as a single pair for occasional use or a box of 50 pairs if you’re inoculating in volume, which brings the per-pair cost down substantially versus buying singles.
Medical grade Cat III PPE: for bulk handling and general protection
The box-of-100 gloves are Cat III PPE — solid general-purpose protection for mixing substrate, handling grain, and other bulk tasks where the main goal is keeping your hands clean and protected rather than maintaining sterility. They’re not individually packeted and aren’t sterile out of the box; if you need them closer to sterile for a lighter-duty task, wipe them down with isopropyl alcohol first. For anything substrate-adjacent where contamination risk is lower, this is the most economical option by a wide margin.
Quick decision guide
- Working in the flow hood, making syringes, transferring cultures? Surgical grade. No substitute.
- Injecting bags or handling sterilised substrate? Sterile examination grade — buy the box of 50 if you’re doing this regularly.
- Mixing bulk substrate or just want your hands protected? Box of 100 medical grade, wiped with alcohol if you want a bit more assurance.
Buying one grade for everything usually means either overpaying for tasks that don’t need surgical sterility, or under-protecting the tasks that do. Stock all three and use them where they’re meant to be used — it costs less over a season than buying surgical-grade gloves in bulk for jobs that don’t need them.