Cytiva Whatman 7193-002 WCN 3um pore size 25mm diameter cellulose nitrate CN hydrophilic membrane filter circle disc

Filter, membrane, disc/circle, cellulose nitrate (CN), hydrophilic, standard, plain, non-sterile, 3.0μm pore size, 25mm (2.5cm) diameter, low levels of extractables, increase temperature stability, fully autoclavable (30 minutes at 121°C), maximum operating temperature 80°C, reduced shrinkage, higher strength and flexibility, white, translucent, pack of 100, Cytiva, Whatman, WCN Cellulose Nitrate, 7193-002.

Cytiva's Whatman cellulose nitrate (CN) membrane filter plain circles:

Narrow pore size distribution for improved surface capture and analysis.

Low levels of extractables to ensure sample integrity.

Recommended for the majority of routine applications, this membrane is manufactured under strictly controlled conditions.

Commonly used in sample preparation in microbiological studies, for the filtration of aqueous solutions.

The user will benefit from the performance improvements that are now available in Whatman membrane filters, including very narrow pore size distribution and low levels of extractables.

Cytiva's Whatman cellulose nitrate membrane filters have higher strength and flexibility...  Most membranes are inherently brittle and difficult to handle; it is not uncommon for filters to be damaged during loading into holders or while in use.  Whatman cellulose nitrate membrane filters have a noticeably improved flexibility and are made to tolerate abuse during handling, loading, and autoclaving without sacrificing integrity.  These membranes are among the strongest of their type available, as measured and compared by burst pressure tests.

Cytiva's Whatman cellulose nitrate membrane filters have low extractable levels...  The level of extractables in membrane filters has become more important with advances in filtration or adsorption techniques.  In particular, pharmaceutical, immunological, and biomedical tissue culture and trace analysis applications can be adversely affected by high extractable levels.  Cytiva Whatman cellulose nitrate membrane filters have a low level of extractables, generally below that of other membranes of a similar type.

Cytiva's Whatman cellulose nitrate membrane filters have a narrow pore size distribution...  One of the major features of Whatman membrane filters is the narrow distribution of pore sizes.  The rated pore size of these membranes is closely controlled due to the advanced manufacturing and control system.  Additionally, the batch-to-batch variation is minimized providing more consistent laboratory results.

Cytiva's Whatman cellulose nitrate membrane filters have increased temperature stability...  Membrane filters are normally autoclaved at 121°C without loss of integrity.  Cellulose nitrate membranes are supplied as circles, sheets, or reels.

Cytiva's Whatman cellulose nitrate membrane filters have reduced shrinkage...  Excessive shrinkage can cause problems during autoclaving and is often the cause of membranes tearing in their holders after autoclaving.  It may also cause a reduction in flow rate and total throughput.  Whatman membranes exhibit a low shrinkage during autoclaving.

Cytiva's Whatman cellulose nitrate membranes are white plain filters - this is the standard membrane filter for the majority of laboratory applications involving particles and cells in the range of 0.1µm to 12.0µm.  The residue after filtration is found to be almost completely on the surface of the membrane and allows physical recovery of deposits and microscopic examination.

Contact us for more information about Sizing Guides.

Contact us for more information about Product Selection Guides.

1.   UK Delivery

1.1   For all orders successfully placed before 16:00 (GMT/BST, Monday to Friday, excluding Bank Holidays and Public Holidays), items are picked and packed for dispatch the same day.

1.2   Goods to be delivered within the UK are dispatched via overnight courier for next working day delivery.  However, due to the relatively remote location of certain UK postcode areas, next working day delivery cannot be provided to all areas.  Based on the postcode specified for your delivery address, the LabShop website checkout will automatically advise you of the courier service(s) available in your area prior to requiring payment.

1.3   Delivery is free on all orders with a combined product value over £500.00 (exclusive of VAT) when either of the following courier services are selected:  “UK England & Wales - Next Working Day Standard” and “UK Scottish Lowlands - Next Working Day Standard”.  Delivery to postcode areas not covered by these two courier services is chargeable, as are all express delivery options - charges vary depending on the geographic location of the delivery address and speed of delivery required.  The LabShop website checkout will clearly state the delivery charge associated to the courier service selected prior to requiring payment.

1.4   Delivery is chargeable on all orders with a combined product value under £500.00 (exclusive of VAT).  Delivery charges start at £15.00 (exclusive of VAT), but vary depending on the geographic location of the delivery address and speed of delivery required.  Based on the postcode specified for your delivery address, the LabShop website checkout will automatically advise you of the courier service(s) available in your area and the associated costs prior to requiring payment. 

1.5   If we are unable to immediately fulfil your entire order from stock, LabShop will dispatch all available products as detailed above, and make subsequent dispatches to complete your order (as goods become available) at no additional charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any fulfilment delays, or issues.

1.6   For exceptionally bulky and/or heavy items, LabShop reserves the right to make an additional delivery charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any issues that arise and agree any applicable surcharges prior to dispatching your goods – if you do not wish to accept, you have the right to cancel your order and immediately receive a full refund.

1.7   LabShop reserves the right to apply a small order handling charge of £10.00 (exclusive of VAT) to all orders with a product value under £100.00 (exclusive of VAT).  If applied, this handling charge will be added to any relevant delivery charge associated with your order and appear in your shopping basket “Order Summary” as a single combined figure under "Delivery".

2.   The Channel Islands and Isle of Man Delivery

2.1   For all orders successfully placed before 16:00 (GMT/BST, Monday to Friday, excluding Bank Holidays and Public Holidays), items are picked and packed for dispatch the same day.

2.2   Goods to be delivered to the Channel Islands, or the Isle of Man are dispatched via overnight courier for next working day delivery.  However, due to the relatively remote location of certain areas within the Channel Islands, next working day delivery cannot be guaranteed to all areas and an additional working day may be required to complete the delivery.  If the timing of your delivery is critical, and you require clarification of the delivery rational applicable to your delivery address, please contact us to discuss your requirement ahead of placing your order.  

2.3   Delivery to the Channel Islands and the Isle of Man is chargeable (irrelevant of order value).  The LabShop website checkout will clearly state the delivery charge associated to the courier service selected prior to requiring payment.  Delivery charges start at £42.50 (exclusive of VAT).

2.4   If we are unable to immediately fulfil your entire order from stock, Safety5000 will dispatch all available products as detailed above, and make subsequent dispatches to complete your order (as goods become available) at no additional charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any fulfilment delays, or issues. 

2.5   For exceptionally bulky and/or heavy items, LabShop reserves the right to make an additional delivery charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any issues that arise and agree any applicable surcharges prior to dispatching your goods – if you do not wish to accept, you have the right to cancel your order and immediately receive a full refund.

2.6   LabShop reserves the right to apply a small order handling charge of £10.00 (exclusive of VAT) to all orders with a product value under £100.00 (exclusive of VAT).  If applied, this handling charge will be added to any relevant delivery charge associated with your order and appear in your shopping basket “Order Summary” as a single combined figure under "Delivery".

3.   Republic of Ireland Delivery

3.1   For all orders successfully placed before 16:00 (GMT/BST, Monday to Friday, excluding Bank Holidays and Public Holidays), items are picked and packed for dispatch the same day.

3.2   Goods to be delivered within the Republic of Ireland are dispatched via courier on a two working day delivery basis.  However, due to the relatively remote location of certain areas within the Republic of Ireland, two working day delivery cannot be guaranteed to all areas and an additional working day may be required to complete the delivery.  If the timing of your delivery is critical, and you require clarification of the delivery rational applicable to your delivery address, please contact us to discuss your requirement ahead of placing your order.  

3.3   Delivery to the Republic of Ireland is chargeable (irrelevant of order value).  The LabShop website checkout will clearly state the delivery charge associated to the courier service selected prior to requiring payment.  Delivery charges start at £25.00 (exclusive of VAT).

3.4   If we are unable to immediately fulfil your entire order from stock, LabShop will dispatch all available products as detailed above, and make subsequent dispatches to complete your order (as goods become available) at no additional charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any fulfilment delays, or issues.

3.5   For exceptionally bulky and/or heavy items, LabShop reserves the right to make an additional delivery charge.  However, in such instances, we will always contact you by email and/or telephone at the earliest possible opportunity after receiving your order to highlight any issues that arise and agree any applicable surcharges prior to dispatching your goods – if you do not wish to accept, you have the right to cancel your order and immediately receive a full refund.

3.6   LabShop reserves the right to apply a small order handling charge of £10.00 (exclusive of VAT) to all orders with a product value under £100.00 (exclusive of VAT).  If applied, this handling charge will be added to any relevant delivery charge associated with your order and appear in your shopping basket “Order Summary” as a single combined figure under "Delivery".

4.   European and International Delivery

4.1   LabShop supplies products to over 50 countries throughout the world - please contact us to discuss your requirements. 

4.2   Unfortunately, European and International delivery cannot currently be facilitated through the LabShop website checkout.  As such, orders requiring European, or International delivery must be managed offline.

1.   Returns

1.1   The only terms and conditions of contract relating to the return of goods between Contract Laboratory Services Limited (T/A LabShop), hereafter known as the Seller, and your organisation, hereafter known as the Purchaser, shall be those set out below. 

1.2   When purchasing goods from the Seller, irrelevant of whether doing so in an online manner (via this website), or offline through the Seller's customer services function, the Purchaser warrants that they are doing so for the purposes of a business, trade, craft, or profession, and as such accept that the no aspects of current consumer legislation, including The Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013, are applicable to the transaction and/or goods subsequently supplied by the Seller.

1.3   The Seller only accepts responsibility to facilitate the return of goods from the Purchaser which are defective, or have been incorrectly supplied by the Seller.   The Seller is not liable for damaged and/or broken goods which the Purchaser received but has failed to sign for as damaged at the point of delivery (via the Seller's third party courier).

1.4   No goods may be returned by the Purchaser to the Seller, without the Seller's written authorisation.

1.5   Authorisation to return damaged, defective, or incorrectly supplied goods must be requested from the Seller in writing by the Purchaser within 7 days of delivery of the goods.  

1.6   Authorisation to return goods which fail to meet the manufacturer's current published specifications must be requested from the Seller in writing by the Purchaser within 14 days of delivery of the goods.

1.7   The Seller will only authorise the return of goods which are unused, in their original packaging and in a condition suitable for resale.  This will not include chemicals or diagnostics, refrigerated or frozen products, or any other form of perishable goods.

1.8   Where goods are to be returned by the Purchaser to the Seller for any reason other than that set out in Clause 1.3 above, the Seller reserves the right to refuse the return, or at its discretion levy a handling fee against the Purchaser of 25% of the VAT inclusive invoice value of the goods to be returned, or a minimum charge of £25 (plus VAT), whichever is the greater.  The Purchaser will be required to agree in writing with the Seller any applicable handling charges prior to authorisation of the return. 

1.9   Where goods are to be returned by the Purchaser to the Seller for any reason other than that set out in Clause 1.3 above, the Purchaser accepts full responsibility for all shipping costs and liabilities associated to the return of goods.  The Seller will not be responsible for returned goods which are lost, or damaged in transit from the Purchaser.

Shop in confidence with our 100% secure site.

To facilitate online payment, LabShop accepts all major credit / debit cards and PayPal. 

If you choose to pay by card you will be transferred to the secure section of the LabShop website where your payment will be processed using Sage Pay as our integrated payment provider.

If you choose to pay by PayPal you will be transferred to the secure section of their website where your payment will be processed.  Once complete, you will then be directed back to the LabShop website where you will be presented with confirmation that your order has been successful.

To comply with and exceed all necessary security requirements to protect your details, the LabShop website and payment gateway use 128bit Secure Socket Layer (SSL) encryption to secure data transmission between the web server and your web browser.  This is the industry standard and currently the highest level of encryption commercially available.

For PCI DSS Compliance we do not store your credit / debit card payment information anywhere on our site.

For more information about Sage Pay please visit www.sagepay.co.uk and for more information about PayPal please visit: www.paypal.com.

If you would prefer to place your order offline and provide LabShop with your payment card details over the telephone, please contact us on 01642 769090 - our customer services team is available to receive orders and process payment between 09:00 and 17:00 (GMT/BST, Monday to Friday, excluding Bank Holidays and Public Holidays).

LabShop can also facilitate offline payment via Bacs transfer and American Express Corporate Purchasing cards - contact us for further details.

You may also wish to consider applying for a Business Credit Account with LabShop - subject to approval, these accounts provide 30 day payment terms and a credit limit high enough to facilitate your purchase requirements.