Contact plates, settle plates, petri dishes, bottled media or specialist packaging made to order

Bespoke Prepared Media Solutions

In addition to our standard range of Redipor® media products, instrument accessories and packaging, we also offer a fully bespoke service for any aspect of your environmental monitoring programs.

Whatever you need: settle plates, petri dishes, contact plates, bottled media or bags, settle plate stands or another product we haven't created yet, we are very happy to discuss your specific requirements and work on a solution that fits.

Cherwell Laboratories are experts at finding solutions for bespoke requirements. We have designed and produced a range of settle plate stands and contact plate carriers, for example, for specific plate placement.

Find out more information on our New Product Request Process.

We have created bespoke packaging solutions, such as the one we developed for Great Ormond Street Hospital, a special VHP impermeable barrier packs for gamma-irradiated media, and peel apart packaging for settle plates to support a UK national study investigating the relationship between microbiological quality of operating theatre air and infection rate.

Additionally, we offer a tailored calibration service for your SAS air samplers, including onsite option, to ensure your instruments are also in top condition.


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What our customers say

Quality Assurance and Cleanroom Specialist

Manufacturer and Supplier of Biocidal and Cleaning Products for Cleanrooms

"Customer service is excellent and I always receive a swift response from one of the team. Should I request a price - I am then provided with information regarding any costs and an estimated delivery date. Once an order is placed, it is always on time. Any queries are quickly resolved. It is a pleasure doing business with Cherwell - it really feels like you care about the customer."

Quality Manager

BioDivide Ltd

"Great customer service and always keeping our company informed of changes particularly concerning regulatory matters that could impact us. Helpful, friendly, efficient."

QA Pharmacist


"I contacted Cherwell in relation to getting an empty vial with a flip top lid for a planned process validation. The person dealing with my request could not have been more helpful and really went the extra mile in helping me to get the product I needed."

Julie Bowden, QA Releasing Officer

Pharmacy Manufacturing Unit, Portsmouth

"Friendly, helpful, efficient. Always get a prompt reply to any query. Always feel like a valued customer. Definitely feel like the company cares about it's customers and respects the industry we work in."

Simon Phillips, Head of Sterile Manufacturing

Nova Laboratories Ltd

"We urgently needed TSB in bottles with a septum, overwrapped and terminally sterilised and in large quantities. Working closely with Cherwell, who provided excellent communication throughout, we were able to meet the time frames for our media fill validation."

Tracey Roberts, Quality Assurance Technician

Wrexham Maelor Hospital

"Cherwell have always provided a great service, with innovative ideas and products. Great customer service too."


Asked Questions

Which culture media should I use?

We can provide a great deal of information so that you can make an informed choice.

Our Growth Media Types page provides information on the different types of prepared media and how they are used in environmental monitoring, sterility testing and process validation as a starting point.

For further information on other media and applications, please phone or email us with details.

We need a specific or bespoke media type. Can Cherwell help?

Our Redipor Prepared Media range is so extensive that not every product is included in the official price list. In addition to offering such a wide selection of products, we have developed a flexible manufacturing process enabling us to produce bespoke solutions.

Contact us to discuss your requirements, whatever they are.

Do I need to store my prepared media in the fridge?

The majority of our prepared media can be stored in ambient conditions, not exceeding 25ºC. There are only a small number of very specialist products that require different storage conditions.

We have never specified refrigeration as a storage condition for our general media as this causes excess condensation and can result in very wet agar, rendering it impossible to use.

What is the maximum exposure time for settle plates?

Settle plates are used to monitor the level of viable particles in the environment through a process of passive air sampling. A viable particle settles on agar plates at a rate dependent on its characteristics and the airflow in the environment.

EU GMP Guide Annex 1 has recommended that 90mm settle plates can be exposed in cleanroom environments for up to 4 hours. However, agar plates may dry out during long exposures where the rate of air exchange is high. So, it might be necessary to use deep filled settle plates, or replace the settle plate after a shorter time to ensure satisfactory growth promotion after exposure.

Why might I want gamma irradiated media?

The sterility of the packaged medium is assured and all but the outer layer of packaging is also sterile. Thus the risk to the environment to be sampled is greatly reduced.

There is an additional benefit that the additional packaging and process extends the room temperature shelf life. This can be sufficient reason for small or irregular users to prefer irradiated.

What is the difference between general purpose and selective growth media?

General purpose media have nutrients that support the growth of most non fastidious culturable microorganisms. Selective growth media contain components that will inhibit the growth of some types of microorganisms, while supporting the growth of others.
General purpose media, such as Tryptone Soya Agar, are used to produce total counts. While selective media, such as XLD for Salmonella species, are used to test presence/absence of specific types of microorganism.

What does triple wrap packaging mean?

Not as obvious as it might sound. 3 layers of wrap between the agar plate and the outside world, of course, but Redipor can offer at least 3 different ways to achieve that with our standard product range.

We then have even more bespoke solutions to meet individual needs. Let us know how and where you want to remove the layers and we can find the best solution.

Can I recycle Redipor product packaging?

View our data sheet on recycling Redipor products.

Cherwell is different

Supplying products is only the start


The best products prepared for you

Our Redipor® media products are batch tested, QC certified and delivered when you need them


Bespoke accessories and services

We provide additional equipment or services to make your environmental monitoring more effective


Best customer service

We build long-standing client relationships on understanding, commitment and trust


get our pocket guide

The Pharmaceutical and Cleanroom Industry's Guide to Prepared Culture Media

A guide to understanding the logistics, best practices and breadth of available prepared media options for varying applications.


Download Guide