CRS has developed unique technologies in the course of developing injection port septa for gas chromatographs. This particular application is characterized by:

• Very high temperatures of operation – to the limit of the material specification
• Exceedingly tight requirements for low emission of volatile and liquid components
• A surface that needs to be resistant to sticking

We can assist in material selection, tool design, and product qualification for elastomeric products that require high levels of cleanliness, both superficially and chemically, or that require specially engineered surfaces. Often dramatic improvements in product performance can be obtained by applying CRS processes to existing seals or O-rings without reformulation.

An example of part cleanup is shown below, in which a solvent extract is analyzed before and after a CRS process is applied. The chromatograms are obtained using a SimDist method (please see ASTM D6352 for a description of this type of analysis, as well as the reference to a commonly used standard). The presence of low-molecular weight components and poorly cross-linked components is virtually eliminated for this silicone compound. The improvement obtained will depend on the nature of the base material, but huge benefits can be seen in a variety of silicones and some FKMs.

Commodity 20 mm PTFE/Silicone cap liner seals
Extract of 20 mm seals as received. Internal standard is shown for scale.	Extract of 20 mm seals after SeptaClean process.
Commodity 20 mm PTFE/Silicone cap liner seals
Extract of 20 mm seals as received. Internal standard is shown for scale.	Extract of 20 mm seals after SeptaClean process.
Medical-grade black FKM (fluoropolymer) o-rings.
Medical-grade o-rings before and after SeptaClean processing. TPPO is a component of the fluoropolymer cure system.

Plasma Coating

• All Injection port septa are ran through a plasma coating process for a non-stick surface
• Easy to change, even after high-temperature use up to 400°C
• Non-stick surface stays clean and does not attract dust.

Uncoated Septa After Exposure to Dust	Uncoated Septa After Cleaning with Air
Coated Septa After Exposure to Dust	Coated Septa After Cleaning with Air

CRS Cares:

Our attentiveness to our customers results in chromatography accessories that set new levels of value. At CRS, value is defined by quality products, technical support, guaranteed performance, and customer satisfaction.

We offer an unrivaled level of expertise in our team of experienced engineers, chemists, and production employees. Whatever the need may be, we will be dedicated to each and every custom project to guarantee customer satisfaction.

Please give us a call today at 502.491.6300 with any questions you may have!

Shop Now