Cytiva Whatman 1441-6309 Grade No 41 25mm diameter quantitative ashless filter paper circle

Filter, paper, disc / circle, quantitative, ashless, cellulose, high quality cotton linters, 25mm (2.5cm) diameter, fast flow, 20um particle retention, 54s Herzberg filtration speed, 4s/100ml/in2 air flow, 215um thickness, 85g/m2 basis weight, 0.007% ash content, white, pack of 1000, Cytiva, Whatman, Grade No. 41, 1441-6309.

Cytiva's Whatman Grade 41 environmental pollution papers are among the fastest filter papers in the Whatman ashless range.  This gravimetric filter is well suited for quantitative analysis of soil and air.

Extremely low ash content (0.007% ash maximum).

20 µm nominal particle retention rating.

Fast filtration speed (Herzberg 54 s).

Commonly used for routine air pollution analysis and soil pollution analysis.

Aside from Grade 41 environmental pollution papers, Whatman quantitative paper comes in a variety of particle retentions, filtration speeds, and filter thicknesses to provide you with the appropriate filter for your precipitate.

Also see LabShop's range of Whatman hardened ashless grades for analysis requiring the use of strong acids or bases.

Fast ashless paper for pollution analysis.

Whatman Grade 41 filters from Cytiva are suitable for quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates.

Grade 41 filters are also commonly used in preparing solid environmental samples (e.g., soils, sludges) for metals analysis after nitric acid digestion.

Grade 41 is also available in a convenient, disposable, 47 mm filter funnel with a 250 ml capacity.  The 47 mm diameter filter can be easily removed for further analysis or culturing.

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.