Description of Septa and Cap for Screw Thread Sample Vials
Hawach Scientific Co., Ltd caps are all manufactured from high-quality polypropylene and fit all of the 8mm and 9mm screw thread top sample vials, very good quality and performance, this type is the most welcomed by all of our clients.
Promptly delivery and service
OEM size and type services
Advantages of Septa and Cap for Screw Thread Sample Vials
Crimp caps provide a strict seal reducing the chance of sample evaporation
The caps and septa available can be utilized in high-quality, compliant glass vials
An optional pressure safety release cap at 45 psi can also be provided.
The HPLC-UV Test of Septa Extractable Species
Use the HPLC-UV method to test of menthol extraction solution of Hawach, Agilent, and Thermo PTFE bonded silicon septa, to confirm there are no obvious extraction species in our septa compared to world-famous septa.
Put 100 mg Hawach, Agilent, Thermo PTFE bonded silicon septa in 2mL ACN: H2O=1:1 solution for 24 h at room temperature, and then use HPLC-UV to test the extraction solution to see if there are some obviously impurities.
According to the HPLC-UV result of the comparison of Hawach, Agilent, and Thermo PTFE bonded silicon septa, we can see that all septa have the same impurity peaks at times 5-10 min and 11-21 min, however, the response level is very small and almost has no influence on customers’ results.
Meanwhile, we suppose that the impurities mainly come from the extraction of the silicon layer, reminding customers to use septa correctly by putting the PTFE layer toward the as-tested liquid.