Image Credit: Sartorius Group   Laboratory filters are used to remove particulates from samples in laboratory-scale applications. They consist of a filter medium and housing or holder that constrains and supports the filter media in the sample’s path.   Types of Laboratory Filters   There are several basic types of laboratory filters.   Membrane filters are thin, polymeric films that contain thousands of microscopic pores. The size of the...
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Q & A on Laboratory Filters

We asked our users for their input on Laboratory Filters. Here are the results of 83 users familiar with Laboratory Filters.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing laboratory filter design?
11 answers
Answers:
The one-piece "push" to filter sample units seem to be more common now. We don't use them, though, because of the expense. Nice time-saver if one can afford it.
~Nancy W., Research, University Park, PA
Filters with more functions: drying, homogenization, blending.
~Csaba S, Research & Development, Debrecen, Hungary
Clear Polypropylene Housing with printed material and pore size.
~Wisut D, Purchaser, Nonthaburi, Thailand
Cost and time. Disposable filters are future of business.
~Carl Gilbert, Project Manager, Peachtree City, GA
Screening out solids from materials that I make is the main use of the filters that I use.
~Ray D., Research & Development, Northboro, MA
"Green" energy saving designs, and ease of use, service products.
~Marketing/Sales, Indianapolis, IN
The ability to prepare samples in the field using hand pumps or other equipment.
~Kelly D, Faculty/Staff, Fort Collins, CO
Solvent purification, nanomaterials design.
~Thomas Cotter, Student, Berlin, Germany
Polymer synthesis, flow patterns modeling.
~General Corporate Mgmt, Cochabamba, Bolivia
From analog to optical.
~Chengheok Kang madam, Quality Control, Singapore
New materials
~Viktor Aristov, BIOSAN purchasing manager (engineer the electrician), Riga, Latvia

Q:
From your perspective, which companies are creating the most innovative laboratory filters?
12 answers
Answers:
Agilent & Restek have some nice ones, but they are probably available from others. I just read their literature more often.
~Nancy W., Research, University Park, PA
Sartorius, Whatman, Millipore, Ahlstrom
~General Corporate Mgmt, Cochabamba, Bolivia
Most manufactures offer the same types of equipment and filters, Nalgene is making filters and holders that are more adaptable to field use.
~Kelly D, Faculty/Staff, Fort Collins, CO
Parker Hannifin, Whatman, Hangzhou ANOW Microfiltration Co., Ltd
~Viktor Aristov, BIOSAN purchasing manager (engineer the electrician), Riga, Latvia
I purchase my filters from Grainger, Fisher Scientific, McMaster Carr.
~Ray D., Research & Development, Northboro, MA
Millipore , Sartorius , Pall
~Ioannis Iossifidis, Engineering Consultant, Kifisia, Greece
Aiguard, Filtration Group
~Marketing/Sales, Indianapolis, IN
Millipore and Gelman
~Carl Gilbert, Project Manager, Peachtree City, GA
RIVIERA, MILIPORE
~Birendra J, Faculty/Staff, Jamshedpur, India
Millipore
~Thomas Cotter, Student, Berlin, Germany
Whatman
~Purchasing, Nairobi, Kenya
Whatman
~Wisut D, Purchaser, Nonthaburi, Thailand

Applications and UseTop

Q:
What are some of the applications you have used a laboratory filter for?
20 answers
Answers:
Lab pre-analysis prep or lab or pilot scale apps for filtrate quality and cycle time prediction, lab pilot full scale RO, membrane and paper and woven fiber, pressure leaf, vacuum leaf, recessed plate, plate and frame, bag, belt, sand, carbon, ion exchange.
~Engineering, Design, Knoxville, TN
Mostly sterilization uses, but I used a specific filter in a manufacturing scheme to remove fluid from particles in a simple washing step.
~Carl Gilbert, Project Manager, Peachtree City, GA
UV-air flow, Cleaner - Recirculator ; HEPA H14 for DNA/RNA UV-cleaner box; 0.22um PTFE In- Line Hydrophobic filter for Aspirators.
~Viktor Aristov, BIOSAN purchasing manager (engineer the electrician), Riga, Latvia
To filter out solids in mixes that I make. To filter water that goes into cooling of different types of equipment.
~Ray D., Research & Development, Northboro, MA
HPLC preparation of samples, solvents, & buffers. Media & antibiotic preparation for fungal and tissue culture.
~Nancy W., Research, University Park, PA
Mostly filtration of chemicals, intermediates and drug substances. Also frequently used for charcoal filtration..
~Csaba S, Research & Development, Debrecen, Hungary
For a water filtering system,( maintenance contract with us) for filtering borewell water/muncipal supply water we require circular filters DETAILS: CIRCULAR "doughnut filters. SIZES D=242 mm, d= 116 , Mesh= SS 314/316 RIMS= BRASS(PREFERED) Screening/filtering = minimum 5 mikrons maximum 10 mikrons WORKING PRESSURE= 5 to 8 Kg/sq.cm Type of construction= bothsides filter cloth mesh with a corrugated sheet between both filter cloth disks and locked in circular rim. Presently we are using items supplied by OEM. we want to replace damaged ones. These filters are packed in a container with inlet and outlet. container is opened time to time and refitted with spare batch of filters.
~Maintenance/Facilities Management, VISAKHAPATNAM-27, India
Filtration of inorganic crystals, purification of water for analysis, craft beer filtration.
~General Corporate Mgmt, Cochabamba, Bolivia
FOR TESTING THE CLEANNESS LEVEL OF DIFFERENT INDUSTRIAL OILS LIKE HYDRAULIC ,LUBRICATING,TURBINE ETC.
~Birendra J, Faculty/Staff, Jamshedpur, India
Cleanroom Filtration Bio-Safety Cabinets Fume Hoods Clean Benches
~Marketing/Sales, Indianapolis, IN
Water sample preparation for analysis, separating sediments.
~Kelly D, Faculty/Staff, Fort Collins, CO
We always use Radioactive Filter in our Laboratory.
~Project Management, Hanoi, Viet Nam
Removal of organic material prior to solvent analysis.
~Research & Development, Stirlingshire, United Kingdom
Solid-liquid filtration, solid-gas filtration
~Thomas Cotter, Student, Berlin, Germany
For testing capacity on others applications.
~Chengheok Kang madam, Quality Control, Singapore
Sample preparation, Sterile filtration.
~Ioannis Iossifidis, Engineering Consultant, Kifisia, Greece
Sample filtration, Solvent filtration
~Wisut D, Purchaser, Nonthaburi, Thailand
Sample prep for HPLC or GC
~Other, Raleigh, NC
Filtration oil
~Yangwang Yangwang, Technical Support, BeiJIng, China
Filtration
~Purchasing, Nairobi, Kenya

Q:
Please share with us any “non-standard” applications that a laboratory filter has been used for.
7 answers
Answers:
Use of the panel filter for branch of a metal shaving from a cooling emulsion in the lathe.
~Viktor Aristov, BIOSAN purchasing manager (engineer the electrician), Riga, Latvia
Screening out media from mixes I make which I have designed a filter for and it works very well and is now in patent.
~Ray D., Research & Development, Northboro, MA
We are using to check cleanliness of lubricating oil up to 680 cSt viscosity
~Birendra J, Faculty/Staff, Jamshedpur, India
As an in-line filter for a high temperature rotary tube furnace reactor.
~Thomas Cotter, Student, Berlin, Germany
Filters with precoat for filtration of fermentation media, biomass.
~Csaba S, Research & Development, Debrecen, Hungary
Too bulky type is not preferable.
~Chengheok Kang madam, Quality Control, Singapore
Colloid filtration
~General Corporate Mgmt, Cochabamba, Bolivia

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of a laboratory filter?
8 answers
Answers:
If a pressure relief is not installed on the filter housings, the person could get sprayed with material if the pressure is not relieved before opening the filter.
~Ray D., Research & Development, Northboro, MA
Samples were compromised because the samples were incorrectly filtered in the field. The samples had to be recollected.
~Kelly D, Faculty/Staff, Fort Collins, CO
When the high purity of the filtered material is important, try to avoid sintered glass filter.
~Csaba S, Research & Development, Debrecen, Hungary
Make sure the filter pore size is smaller than the pore size of your HPLC column.
~Nancy W., Research, University Park, PA
Filter chosen was discontinued due to company being sold and low volume, however, it met all of my needs at the time. Had to go back and find another set of filters that did not work as well in the current procedure.
~Carl Gilbert, Project Manager, Peachtree City, GA
The customers know how to choose the kind of filters
~Wisut D, Purchaser, Nonthaburi, Thailand
Non-compatibility.
~Chengheok Kang madam, Quality Control, Singapore
Lost product
~Thomas Cotter, Student, Berlin, Germany

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
10 answers
Answers:
Portable, shatter proof, easy to use, quick to filter samples, high quality products that lead to reproducible results.
~Kelly D, Faculty/Staff, Fort Collins, CO
High solids retention capacity, medium to high flow rates, moderate costs
~General Corporate Mgmt, Cochabamba, Bolivia
High temperature (>800°C), inert, non-dusting
~Thomas Cotter, Student, Berlin, Germany
Minimum dead volume , broad compatibility, both hydrophilic and hydrophobic, low adsorption, low extractable membranes, full range of pore sizes,
~Ioannis Iossifidis, Engineering Consultant, Kifisia, Greece
A small (syringe type) filter that could filter semi-solid materials with outletting semi-solids block filter. Do not need sterility filtering but would need filter assembly to be sterile so it does not introduce additional contaminates. Also would like to back flush a filter to help recover materials trapped by filtration.
~Carl Gilbert, Project Manager, Peachtree City, GA
On how many simply to establish. On how many simply to utilize.
~Viktor Aristov, BIOSAN purchasing manager (engineer the electrician), Riga, Latvia
Press filters, filter-dryers, filters with control devices.
~Csaba S, Research & Development, Debrecen, Hungary
The size is to be miniature.
~Chengheok Kang madam, Quality Control, Singapore
Solvent resistance
~Nancy W., Research, University Park, PA
Packaging
~Wisut D, Purchaser, Nonthaburi, Thailand

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of a laboratory filter?
7 answers
Answers:
It has got to be scalable if you are in industrial R&D. Also, make sure that the filter/Company you choose will be around for the long haul.
~Carl Gilbert, Project Manager, Peachtree City, GA
Attempting to use the wrong size, type of material, or wrong pore size will lead to bad data.
~Kelly D, Faculty/Staff, Fort Collins, CO
Identify and ask for compliance to the specific needs of the sample nature, origin and the method use for the analysis(application).
~Ioannis Iossifidis, Engineering Consultant, Kifisia, Greece
Try to match the product particle size with the filter and consider centrifugation as an initial step.
~Thomas Cotter, Student, Berlin, Germany
The compatibility of liquid with themidia must be checked before buying.
~Birendra J, Faculty/Staff, Jamshedpur, India
Choose such filter what (type) you can use in larger scale too.
~Csaba S, Research & Development, Debrecen, Hungary
Parameters specified in details.
~Chengheok Kang madam, Quality Control, Singapore

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using laboratory filters?
8 answers
Answers:
Scaling from syringe filter in the lab to a larger filter system in manufacturing is always hard. Go with a company that can help at the initial phase (syringe), know that they make a comparable filter/assembly for larger volumes. Go disposable - eliminates cleaning validations, factor disposable filter into product costs.
~Carl Gilbert, Project Manager, Peachtree City, GA
When using aggressive solvents, check the resistance of the materials used.
~Nancy W., Research, University Park, PA
Quality is more important than price. Find a company with a long standing service record that will be around when you need to reorder supplies.
~Kelly D, Faculty/Staff, Fort Collins, CO
The quality (pore size) differs from one supplier to other. The rates also vary.
~Birendra J, Faculty/Staff, Jamshedpur, India
Quantitative or qualitative? Be aware of chemical inertness.
~Thomas Cotter, Student, Berlin, Germany
Validate their filters' compliance for critical application : example sample prep for identification and quantitation of residual substances by LC-MS.
~Ioannis Iossifidis, Engineering Consultant, Kifisia, Greece
Thin technology.
~Chengheok Kang madam, Quality Control, Singapore
Only laboratory
~Wisut D, Purchaser, Nonthaburi, Thailand


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