ParafilmM PM999 All-Purpose Laboratory Film, 4" x 250' on 1" Core

If you've ever wondered what CostCo uses to make their organic bananas last longer, this is it. Sometime in the past couple of years, CostCo stopped wrapping their regular bananas with this stuff, and as a result they ripen faster - much faster. Applying this tape over the exposed stem will limit oxygen being able to get in allowing the bananas to generate ethylene gas and ripen faster. So, if you'd like to preserve your 'conventional' bananas longer or slow their ripening, this is the tape for that purpose.

I use this to seal the caps on moisture-sensitive casting resins and the like. It's the by far the best solution I've found to keeping humidity out and extending their life.

Seal agar plates great!

The classic, user-friendly, flexible solution for the lab (or many projects at home). I have used Parafilm-M for years and happy to say, it is one of my most favorite, multi-functional products of all time. Highly recommend it for lab and for other uses around the house. I have heard the term "coat hanger and duct tape" for years...that term needs to be restated as "coat hanger, duct tape, and Parafilm!"

It's wound so tight, that the outsides stick to the roll as you attempt to pull a length out. Which causes it to teat and stretch in those areas. The parts that don't stick seem to have some kind of indentions all over the place causing it to Brea when wrapping an agar plate. Very disappointed In this purchase.

Parafilm is routinely used in lab settings and we needed to replenish our supply. It works as expected.

I like the 4" wide roll since it is wide enough to get around standard 100 x 15mm petri dish and you only have to cut a thin (about 1/4") piece off. If you cut a bigger piece (about 3/4") you can get it around a glass petri dish. I imagine my roll will last a really long time.

Great product once you get the hang of how to hold while spinning your Petri dishes.