Alcohol Wipes

70% isopropyl alcohol prep pads, individually wrapped

Individually-wrapped 70% isopropyl alcohol prep pads for cleaning vial stoppers and work surfaces before drawing. Sold singly or in packs of 10.

Mechanism#

A sachet is torn open and the vial stopper and working surface wiped, then left to air-dry before drawing, which is what keeps the path clean.

Areas of research#

• 70% isopropyl alcohol
• Individually wrapped, sterile
• Cleans stoppers & surfaces
• Sold singly or in packs of 10

Why 70% and not higher#

The counter-intuitive fact about isopropyl alcohol is that 70% disinfects better than 99%. Alcohol kills by denaturing proteins, and that reaction needs water. Undiluted isopropanol dehydrates the outer surface of a bacterial cell so quickly that it fixes a coagulated shell in place before the alcohol has penetrated, leaving the interior intact. A 70% solution works more slowly, stays wet longer, and reaches all the way through. The water is not a dilution of the active ingredient — it is part of the mechanism.

The same logic explains why the wipe has to be allowed to dry rather than blotted. Contact time is what does the work, and a surface wiped and immediately used has had a few seconds of exposure where it needs closer to thirty. Drying also matters because residual alcohol carried into a vial on a needle can denature the peptide it was meant to protect.

What a prep pad is for in a laboratory#

Two surfaces, mainly. The vial stopper is wiped before every entry, not just the first: the septum sits exposed between withdrawals and collects whatever is in the air of the room. And the work surface, wiped down before laying out vials, solvent and syringes, so that anything set down is not immediately recontaminated.

A pad is not a substitute for a clean bench or for aseptic technique. It reduces the bioburden on a surface; it does not sterilise it, and it does nothing about what is already inside a vial. A single wipe is also a single-use item — once it has passed over one surface it is carrying material from it, and wiping a second surface with the same pad moves contamination rather than removing it.

Individually wrapped, and why that matters#

Sachets exist because the alcohol is volatile. A tub of loose wipes starts losing concentration the first time the lid is opened, and the pads nearest the top dry out fastest — so the strength of the wipe becomes a function of how long the tub has been open and which one you happened to pull. An individually sealed pad is at its stated concentration until you tear it. Pads that feel less than saturated when opened have a compromised seal and should be discarded rather than used.

Handling and storage#

Store the box dry, at room temperature, away from heat and out of direct sunlight, and keep it well away from open flame and hot plates — isopropanol is flammable, and so is a drawer full of pads. Sachets have an expiry date that reflects seal integrity rather than the alcohol going off. Used pads are general waste, not sharps, but they should be allowed to dry before being binned rather than sealed damp into a bag.

One practical note for anyone shipping or travelling with them: alcohol pads are restricted or prohibited in the post to a number of countries, which is why they do not travel on international orders from us.

Sizes and pricing#

Working with lyophilised peptides? See our pens, syringes and needles guide, reconstitution guide, storage guide and how to read a COA.