COBETTER Membrane Filter Nylon, Diameter 47mm, Pore Size 0.22µm, pH 3-14, 100 Sheets, Lab Filtration Membrane *I received this from a friend, so I don't have all the details, but I believe it is this product based on my search. Please consider this if you know more about it. 【Chemical Compatibility】Compatible with pH 3-14. 【High Mechanical Strength】Excellent durability, can be used for a long time without cracks or damage. 【Nylon Membrane】Naturally hydrophilic, easily wetted by water. 【Application】Suitable for filtration of aqueous solutions and most organic solutions, especially alkaline and alcohol solutions, and also suitable for DMSO. MFNY-2247 100PCS S/N 017-020 #tsunasuke daily necessities I'm selling various items* 44-9 002500 s-4 ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ #tsunasukeshop I am selling a variety of items such as miscellaneous goods, home appliances, smartphone cases, cables, and DIY supplies* ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ ⋱⋰ I didn't see any noticeable stains on the product, but there may be oversights. Please check the images. I will ship with simple packaging as much as possible*・+☻