The 1290 seal has sealing material made of Vespel. Vespel is suitable for applications using mobile phases within the pH range of 2.3 – 9.5 , which is suitable for most applications. However, for applications using mobile phases with pH below 2.3 or above 9.5 , the Vespel seal can degrade faster, leading to reduced seal lifetime.
The 1260 injection valve has a sealing material made of PEEK. This material has high chemical resistance and versatility. It is suitable for application using mobile phases within a pH between 1 and 14 .
NOTE
Strong oxidizing acids such as concentrated nitric and sulfuric acids are not compatible with PEEK.
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