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PVDF VS PTFE
- Thread starter bayleyt
- Start date
Anonymous35
Member
Ptfe far better or nylon
Pvdf good for bact water thats it
Pvdf good for bact water thats it
sinistral
Member
Some information on filters and their compatibility with certain chemicals.
Anonymous35
Member
Ptfe and nylon are the best
egruberman
Member
The best deal I've found so far on a "reputable" brand are these:
$212 or so for a pack of 100 25mm, .22 micron. Anyone know of a better deal?
PTFE Syringe Filters, 0.22 um, 25mm, Double Luer Lock, PP Housing, Sterile, 100 per pack, SPEC18137
Buy Sterile PTFE Double Luer Lock Syringe Filters, PP Housing, 0.22um x 25mm, 100/pk Fast Shipping Knowledgeable Support
scientificfilters.com
$212 or so for a pack of 100 25mm, .22 micron. Anyone know of a better deal?
Anonymous35
Member
I find 33mm 0,22mcr 30pieces on amazon for 30 euroThe best deal I've found so far on a "reputable" brand are these:
PTFE Syringe Filters, 0.22 um, 25mm, Double Luer Lock, PP Housing, Sterile, 100 per pack, SPEC18137
Buy Sterile PTFE Double Luer Lock Syringe Filters, PP Housing, 0.22um x 25mm, 100/pk Fast Shipping Knowledgeable Supportscientificfilters.com
$212 or so for a pack of 100 25mm, .22 micron. Anyone know of a better deal?
egruberman
Member
"reputable"
Anonymous35
Member
Does it change anything ? No its sterilised and it work great never had a problem or infection in 2/3 years
egruberman
Member
Yes, it does.
I'm not sure which specific syringe filter you're looking at on Amazon, but the first one that I can find has this title: "Sterile Syringe Filter PTFE Hydrophobic Filtration 0.22 um Pore Size, 25 mm Membrane Diameter, 20 Pack, Sterile Packed Individually for HPLC Sample Preparation"
It's sold by "PEKY BIOTECH" and says explicitly on the packaging "For Lab Use Only". There's nothing to suggest they could be used in the preparation of parenteral compounds.
I figure there's a high probability that they are fine, probably sterile, probably PTFE as advertised, and probably hydrophobic, but there's no guarantees.
When I refer to a "reputable" producer of syringe filters, I'm thinking of companies that manufacture and sell filters that adhere to USP standards for sterility and particulate matter as well as ISO standards for sterilization.
In my case, it change the degree to which I trust the producer. I filter all my gear, but I also have faith that my gear is also sterile. There's no reason to believe that it's not, but I have no guarantee nor chain of trust to prove that it is. As such, if I want that guarantee, I'll filter, and I'll do so with a filter that offers that increased level of trust, which is something I'm willing to pay for.
From my perspective, filtering UGL gear that's sterile based on faith with a filter the characteristics of which are based on faith buys me little extra reassurance.
If you take the probability of either being sterile and model them as such:
Pfinal=P1⋅P2+(1−P1)⋅P2
You find that adding the filter with anything less than 100% confidence does little to improve the risk.
Ghoul
Member
I wouldn't go any lower in quality than Cobetter.
The Tisch filters are quality as well right? Thats what i ended up getting.
Ghoul
Member
Yes. More holdup volume than other brands for some reason, but certainly a quality brand.
egruberman
Member
How to spot "reputable" brand:
Comes with a Lot number, is traceable, has both a manufacturing date and an expiration date.
FWIW, I found few cheap batches on ebay, but they were all expired by 5 years or more. Probably fine, but I want something better than "probably".
Comes with a Lot number, is traceable, has both a manufacturing date and an expiration date.
FWIW, I found few cheap batches on ebay, but they were all expired by 5 years or more. Probably fine, but I want something better than "probably".
Anonymous35
Member
Its also state « for lab use only »
Ateam2023
Member
very good product imo,,,,, 
Ateam2023
Member
Ateam2023
Member
i also have sterile ks-tek bottle top filters 1000 ml , in nylon,,,
These are great! Way better than name brand from medlabs!
xrayphoton13
Member
12PCS Sterile PES Bottle Top Vacuum Filtration with 0.22/0.45μm Nylon
★★★ Ks-Tek disposable Vacuum Filtration units are very useful in large volume samples separation and purification for tissue culture media, biological fluids and fixation buffers. ★★★ Designed to fit plastic or glass media bottles with 45mm neck sizes.Manufactured in North America to the...
ks-tek.com
Is this it? Sorry I'm a total noob to homebrew
Ateam2023
Member
something similar yes, but i won't be using those plastic media bottles that come with them , i'll use glass,,,12PCS Sterile PES Bottle Top Vacuum Filtration with 0.22/0.45μm Nylon
★★★ Ks-Tek disposable Vacuum Filtration units are very useful in large volume samples separation and purification for tissue culture media, biological fluids and fixation buffers. ★★★ Designed to fit plastic or glass media bottles with 45mm neck sizes.Manufactured in North America to the...ks-tek.com
Is this it? Sorry I'm a total noob to homebrew
