1. Wet heat sterilization, can be reused.

2. Good light transmittance, unable to break. (Material: commonly known as metallic glass)

3. Good sealing, culture for 5-7 days, and the culture medium will not dry or crack.

4. The inner diameter is 56.6mm, and the effective surface area of the culture medium is 25cm2, which meets the requirements of the new version of GMP for surface microbial sampling.

And provide disposable contact discs (empty) and contact discs with TSA culture medium to meet the requirements of various surface microbial sampling and user needs.

Surface Contact Disc Description: Inner Diameter 56.6mm Contact Plate (Contact Disc): Used for the determination of surface microorganisms on equipment, workshops, personnel, packaging materials, etc. Replace the cotton swab wiping method, reduce the sampling steps, and ensure the accuracy and safety of sampling. The effective surface area of the culture medium is 25cm2, which meets the sampling requirements specified in the new GMP standard.

It can achieve the expected goals and accurately reflect the surface microbial conditions of the clean area. The contact disc method significantly reduces the introduction of uncertain factors, making the results more reliable and accurate; The use of contact disc method is also in line with domestic and international development trends; With more authentic and reliable data, our QA monitoring level can be significantly improved; It can also promote the improvement of workshop hygiene management, thereby ensuring better quality of our products and reducing the occurrence of potential risks.

However, several urgent problems were encountered during the implementation process:

1. Sampling points: A more scientific and reasonable setting of sampling points is needed to make the results more representative. The sampling deviation between QA (sampling position, sampling time) is something we need to continue improving.

2. Cleaning issue after sampling: It is preliminarily determined to wipe with alcohol before wiping with injection water. There are certain difficulties in cleaning the hundred level laminar flow hood, mask, and front chest among the sampling points currently set. We are also actively searching for more suitable culture media to minimize residue as much as possible.

3. Fragile culture medium: This requires us to stop immediately when filling the dish, without overflowing. During the sampling process, care should also be taken to apply light pressure and not damage the surface layer of the culture medium.

In summary, in future work, we will continue to improve the contact disc method and minimize potential risks caused by the introduction of new methods. Our future improvement goals are to establish scientific sampling points, improve cleaning methods, and establish corresponding supporting documents.