Sample Security Test Packs

The Headspace technique requires temperature and pressure stable vials and closures. The closure needs to provide four important features:

1. Temperature stability up to 200°C
2. Pressure stability up to 3 bar
3. Resealability after first penetration
4. Hardness compatibility for every type of GC needle, incl. SPME glass fibers

The last two points are a challenge for many septa, as points 1 to 3 usually are fulfilled by septa with a thickness of 2-3 mm. But for point 4 there can be multiple issues due to the needle bending or breaking. Using a thinner septum deals with point 2 as a thin septum does not provide enough compression on the glass crimp border to be tight and stable enough at elevated temperatures.

The new Thermo Scientific Chromacol STME septa with large thinned penetration for crimp and screw thread caps meet all 4 points perfectly!

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High quality polypropylene microplates coated with 200nm thick layer of silicone dioxide (glass). Plate+ provides microplates with a chemical resistance similar to glass while retaining the advantages of polypropylene. Eliminates the need to use glass limited volume inserts. Excellent for applications where plastic microplates are not applicable. Plate+ is chemically and thermally resistant and will tolerate temperatures from -80°C to +80°C. Lightweight, precision molded, cost-effective alternative to solid glass plates.

Plastic plates adsorb polar substances such as norbuprenorphine, which leads into a recovery rate which is only 80%! Glass covered plates do not interact with polar analytes which leads into a recovery rate of 102%.

For polar analytes it is recommended to use glass covered plates to avoid interactions with the surface. Furthermore glass coated plates are more inert towards organic solvents, therefore they are the better choice for HPLC and GC applications where a higher grade of organic solvents are required.