Filter Testing
Services

Filter Cut Point Testing

Our most popular test is our Filter Cut Point or 'Challenge Test'. Performed dry, glass microspheres are fluidised by a Sonic sifting action, challenging the filter to provide the d97%.

Our Requirements:
Samples must have an estimated cut point of between 20 and 600 microns.  We require 90mm flat circular discs in order to perform the test (if possible, please send 2 samples per test.  This is simply to ensure a good set up)

Please label your samples clearly - Whatever you label your samples with will be referenced on your certificate. Ideally send your samples sealed in a labelled plastic bag.  Also, if possible, please indicate an estimated nominal pore size for each sample.

Results are returned as a PDF NIST Traceable Certificate via email within 5 days of our receiving your samples.

Charging and Expansion

The first rule of any technology used in a business is that automation applied to an efficient operation will magnify the efficiency. The second is that automation applied to an inefficient operation will magnify the inefficiency.

Video Support

Engineering or technology is all about using the power of science to make life better for people, to reduce cost, to improve comfort, to improve productivity, etc.

Operating Requirements

Technology is nothing. What's important is that you have a faith in people, that they're basically good and smart, and if you give them tools, they'll do wonderful things with them.

For a small additional fee, an Express Service is available which will ensure we drop everything to test your samples! The Express Service will ensure your results are returned within 1-2 days.

FILTER TESTING (2020)

FILTER THICKNESS MEASUREMENT
Thickness measurements over 5 random areas are determined on a single filter
Example uncertainty @ 250µm = ±2%
NIST traceable – with Test Certificate
All filters must be clean and decontaminated before submission.
£95
AIR PERMEABILITY
5 measurements are determined on a single filter of 2.5cmor 5cm diameter
Test Pressure: 20 – 500 Pa
Measuring accuracy: ±3% of displayed value
Textest Test Certificate 
All filters must be clean and decontaminated before submission.
£100
DIRECT MEASUREMENT BY IMAGE ANALYSIS
Apertures on a single filter are measured in both X and Y directions by PoreSizer™ using transmitted light. 
Size range 3 –2000µm Example uncertainty for a 5µm mesh = ±3% 
NIST traceable Test Certificate supplied. 
All filters must be clean and decontaminated before submission.
£195
FILTER CUT-POINT (DRY CHALLENGE TEST) MEASUREMENT
Glass reference microspheres are fluidised by Sonic sifting action over a single 90mm diameter filter. 
Gravimetric interpolation method employed equates to the d97%, Cut Point. 
Size range 20 –5000µm Example uncertainty for a 125µm mesh = ±4µm 
NIST traceable Test Certificate supplied. 
All filters must be clean and decontaminated before submission.
£275
FILTER CUT-POINT (WET CHALLENGE TEST) MEASUREMENT
An aqueous suspension of glass reference microspheres fluidised by ultrasonic action over a single filter 
A minimum filter diameter of 90mm is required.
Particles penetrating the filter are analysed by PoreSizer™ todetermine the d97, Cut Point.
Size range 3 to typically 100µm Example uncertainty for a 15µm mesh = ±0.6µm
NIST traceable Test Certificate supplied. 
All filters must be clean and decontaminated before submission. 
£400
MAXIMUM PORE SIZE BY PENETRATING GLASS MICROSPHERES (d99.5)
Appropriate sized certified glass reference microspheres are fluidised by either wet ultrasonic or dry sonic action over five 90mm diameter filters.  
At least 250beads passing through each disc are counted and measured by microscopy(PoreSizer™). 
5 repeat determinations performed on a single filter. 
Maximum poresize is measured at d99.5 Example uncertainty for a typical 200µm mesh = ±8% 
Size range 3 –500µm 
NIST traceable Test Certificate supplied. 
All filters must be clean and decontaminated before submission.
£450
SAND SCREENS. MAXIMUM PASSING PARTICLE
Based on Annex D of ANSI/API Specification 19S and ISO 17824
Appropriate sized certified glass reference microspheres are fluidised by either wet ultrasonic or dry sonic action over 5 x 90mm diameter discs.  
At least 250beads passing through each disc are counted and the largest particle passing(d100) measured by microscopy (PoreSizer™). 
The largest particle from each of the 5 tests is recorded. 
Example uncertainty for a typical 200µm mesh has been proven to be as large as ±47%. 
Size range 3 –500µm 
NIST traceable Test Certificate supplied.
All filters must be clean and decontaminated before submission.
£550
FILTER WATER FLOW RATES: AQUAPORE™
A 15mm diameter surface area of mesh is exposed to a constant head of Reverse Osmosis filtered water with approximately 4 litres of water flowing through the mesh. 
Weight readings are taken at 0.25 second intervals and a graph of water flow versus time produced. 
The resulting mean flow rate (litres/minute/dm2 at 0.1 bar pressure) is calculated from20 successive time points once initial flow reaches stability. 
Example uncertainty for a typical 20µm mesh with a flow rate of 730 l/m/dm2is ± 5 l/m/dm²
All filters must be clean and decontaminated before submission. 
£450
ISO17025 compliant

Customer Testimonials

I am always completely satified with the service and relationship.

It is always a pleasure working with you all.

R K - USA

I am really happy with the prompness and quality.

Good Job.

A S - UK

I called Whitehouse Scientific directly from the USA and I got my standards in 2 days at the price I was quoted.

Fantastic Service!

M.D USA

We are always satified with your business.

Y.K Japan

I am really happy with the prompness and quality.

Good Job.

A S - UK

I called Whitehouse Scientific directly from the USA and I got my standards in 2 days at the price I was quoted.

Fantastic Service!

M.D USA

We are always satified with your business.

Y.K Japan

I called Whitehouse Scientific directly from the USA and I got my standards in 2 days at the price I was quoted.

Fantastic Service!

M.D USA

We are always satified with your business.

Y.K Japan

We are always satified with your business.

Y.K Japan