Ensure that your system, process or procedure is demonstrably ready-for-use!

A validation means the documented proof that a process, test procedure or system meets the previously specified requirements (acceptance criteria) reproducibly in practical use.

A validation is always required if the result of a process cannot be verified by a test.

With regard to patient safety in the field of medical technology and pharmaceuticals, validations are indispensable.

Our laboratory is accredited for the following validations and the necessary tests. The following list is intended to show some of our validation activities. We can carry out other validations at any time on request.

  • Packaging validation as per ISO 11607 (more)
  • Performance check or transport validation according to ISO 11607 (more)
  • Validation of the endotoxin determination according to Ph. Eur. 2.6.14 and 2.6.32, ANSI AAMI ST 72 and USP chapters 85 and 161 (more)
  • Validation of microbiological test methods (microbial count determination and sterility testing) according to ISO 11737 or Ph. Eur. 2.6.1 and 2.6.12 (more)
  • Validation of gamma sterilisation (more)
  • Validation of further sterilisation methods (according to ISO 14160) (more)

In addition to these common validation activities, we have already repeatedly proven our competence in the

  • development and validation of complex, product-specific test methods.
  • validation of aseptic production processes.

With our comprehensive expertise, we are sure to find the right validation strategy for your question and test.

Packaging validation as per ISO 11607

Due to our many years of experience in the field of packaging testing of medical devices, we offer comprehensive skills and advice in the field of packaging validation.

We advise our customers in the selection of testing methods. Together with our customers, we design the test planning and evaluate the test results in comprehensive reports. Our documentation and working methods are based on ISO 11607.

We consult on and check all steps necessary for a complete packaging validation, such as

  • validation of the sealing process through operational qualification and performance qualification including statistical evaluation (e.g. by determining the Cpk value)
  • Inspection of the compatibility of the packaging with the sterilisation process (incl. statistical evaluation and creation of X- and R-bar charts)
  • Inspection of the long-term stability of the packaging using data from accelerated or real-time ageing (incl. statistical evaluation and creation of X- and R-bar charts)

To the overview

Performance check / transport validation

In order to ensure product safety and sterility even during transport, the ISO 11607 standard requires performance testing in the form of transport validation.

We conduct these for our customers through the involvement of qualified cooperation partners. During a transport validation, e.g. according to ASTM D7386 or ISTA 2A, the finally packed products are exposed to various stresses which serve to simulate transport, such as temperature and humidity changes, vibration, drop test, negative pressure, etc. Once the packaging has gone through the defined test sequences, a visual examination of the individual components of the packaging system can be carried out. In addition, our test methods for checking packaging integrity are also applied here.

To the overview

Validation of endotoxin determination

For the validation of endotoxin determination, if possible three batches of a product are tested according to chapter 5.1.10 of the European Pharmacopoeia. As per ANSI AAMI ST72 two to ten products per batch are tested and three to ten products are to be inspected according to USP chapter 161. Usually, the products are tested as pooled samples.

The interference factor analysis is important for the detection of endotoxins. The goal here is to demonstrate that the detection system is not disturbed in the presence of the product. For this purpose, a known amount of endotoxin is added to the preparation and then checked to see whether this amount can be detected. The recovery should be between 50 and 200 % to be able to rule out interfering factors.

To the overview

For further information on testing for bacterial endotoxins according to Ph. Eur. 2.6.14 or 2.6.32, according to ANSI AAMI ST 72 and USP Chapters 85 and 161 see Services/Testing laboratory Microbiology.

Validation of microbiological test methods (microbial count determination and sterility testing) according to ISO 11737 or Ph. Eur. 2.6.1 and 2.6.12

According to the intention of the pharmacopoeia, the test methods described therein are already validated. However, these methods must still be validated to see whether they are generally suitable for testing the specific sample.

In the microbiological test methods, this is done by a so-called growth suitability test, often also referred to as bacteriostatic/fungistatic test. It is tested whether certain reference strains show equally good growth reactions in the presence and absence of the product to be tested.

The ISO standard goes far beyond the requirements of the pharmacopoeia, as it does not only require a test of the growth conditions on the basis of reference microorganisms. In addition to the bacteriostatic/fungistatic test, a comparative microbial count is carried out using different nutrient media and incubation conditions to check under which conditions most microorganisms and their species are detected. Since medical devices (in contrast to pharmaceuticals) usually have to be extracted in order to remove the adhering microorganisms and transfer them into the test solution, it is usually necessary to check the microorganism’s removal procedure in order to determine the recovery rate and derive a corrective factor from this.

The test is particularly complex if the samples contain antibiotics, for example, or if they are sponge-like products. These types of products can worsen the process of removing microorganisms immensely. Products containing antibiotics can possibly cause toxic effects on the microorganisms during the detachment process.

To the overview

Validation of gamma sterilisation

The validation of the gamma sterilisation is subdivided into:

Microbiological sterilisation validation

In addition to the application-technical validation and dose distribution measurement, gamma sterilisation also requires the validation of microbiological sterilisation.

This is the minimum irradiation dose required to bring the product into the sterile state. The initial microbiological state - number and type of microorganisms - is determined for this purpose. On the basis of the initial state, a certain dose, the verification dose, is determined. The products are irradiated with this verification dose and then tested for sterility. If the verification dose has been successfully verified by the sterility test, the sterilisation dose shall be confirmed. In doing so, it can be guaranteed that the validated sterilisation dose reaches a Sterility Assurance Level (SAL) of 10-6.

The sterilisation validations in our company are based on the following standards: ISO 11137-1, ISO 11137-2, ISO 11737-1, ISO 11737-2 and EN 556.

As far as possible, we recommend the so-called VDmax25 method and method I. The VDmax25 method is suitable for the validation of sterilisation with a minimum dose of 25 kGy (the usual method) and a bioburden of not more than 1000 CFU/product unit.

Method I, which is also widely used, is suitable for determining a minimum irradiation dose necessary for successful sterilisation. With this method, lower sterilisation doses can be achieved with demonstrably low microbial count, which are gentle on the product.

Revalidation / dose of gamma sterilisation audits
In addition, we offer our customers sterilisation dose testing to prove consistent efficacy by means of a typically quarterly revalidation (dose audit). Compared to microbiological validation, we only need a fraction of the test sample here. The dose audit consists of a microbial count determination (bioburden determination) and a check of the verification dose determined in the validation.

Special requests regarding gamma sterilisation
At the customer's request, individual batch validations and VDmaxSD methods in accordance with ISO 13004 can be carried out in our company.

Building on our numerous years of expertise, we can advise you comprehensively on the selection of the most suitable validation method for your product at any time.

Determining the dose distribution/mapping
Determining the dose distribution

The determination of the dose distribution ensures that the determined dose is adhered to in all areas with specified packaging and packing arrangement. For this dose distribution measurement / dose mapping, a large number of dosimeters are attached to the sterilisation unit as shown in the figure. These dosimeters can be used to determine the product-specific minimum and maximum doses as well as the permissible dose range at the routine measuring point.

Application-technical validation (compatibility, durability and performance testing of the product as well as sterile barrier system)

The manufacturer must check whether the sterilised product fulfils its property profile beyond the expiry date. The packaging material must be included in this. The materials selected for the product are considered to be decisive for the application of radiation sterilisation. We will be happy to advise you on this during product and packaging development. An initial overview in the form of publications about the procedure can be found on the homepage of the Gamma Irradiation Panel. If you have any questions regarding the compatibility of your material with gamma radiation, please contact our contact persons. We generally recommend our customers to conduct a trial sterilization to determine the maximum tolerated radiation dose.

Validation of further sterilisation processes

At our company, we have extensive experience with


  • sterilisation with liquid/chemical sterilisers according to ISO 14160

We will support you in the development or validation of the above mentioned sterilisation process. You can thus benefit from our extensive experience. For example, we can support you in analysing the microorganisms of the product-specific bioburden that are hardest to inactivate and determining their inactivation kinetics. Building on this, the validation of the sterilisation process can then be tackled.

To the overview

Your contact persons

Should you have any questions about our services, please do not hesitate to contact us.

Herr Dr. Norman Layh
Dr. Norman Layh
Business Development
Herr Dr. Christopher Rösch
Dr. Christopher Rösch
Testing laboratory

BBF Sterilisationsservice GmbH
Willy-Rüsch-Str. 10/1
71394 Kernen-Rommelshausen
+49 7151 94570 -0
+49 7151 94570 -12