Synthetic Filter Discs 70mm for a Buchner Funnel and fit"Regular Mouth" Size Used for Mushroom Cultivation (24)

Arrived on time, these disc fit perfectly on a regular sized ball jar. They appear to be correct and made strong. I do not know if they work yet as I haven't attempted to use. However they seem sturdy and possibly able to use multiple times. The steam bath will be test 1 and contamination will be test 2. They are significantly less money than you will find on some sites.

I cut them in pieces and RTV'd them over small gas exchange holes in reusable plastic lids. Just what I needed, quality is good.

They're thick, definitely reusable and will last through steaming. I used them fluffy side up, and they let a little too much air through and my spawn rapidly started to dry out. Although my jars were in a very dry location, I'll be switching that next attempt.

Sterlization

We thought these had a peelable sticky back. However there is a non-peelable plastic backing which prevents any air flow whatsoever, negating the entire purpose of the product. I guess I now have 24 shot glass coasters. Thanks for nothing!

High quality

Size is perfect and they arrived super fast. I have two concerns with this product: 1) there are two sides-one smooth and glossy and the other other is felt-like and fuzzy. 2) they are about twice as thick as other brands and distorts too easily. Most likely this happened during manufactureand #1 is causal to #2. I can't help thinking that if both faces were shiny/heatt embossed this would be a non issue. Pretty sure I can't buy these agai and will have to go back my old vendor, bummer I wanted these to work.Pics above: top row: this product, alternating fuzzy side up, fuzzy side down. Bottom row: the 'other guys' product. You can see the fuzzy shiny of you zoom.

Served the purpose