What is the shelf life of Gelex standards?

Document ID

Document ID TE965

Published Date

Published Date 31/10/2019
Question
What is the shelf life of Gelex standards?
Summary
Life/Expiration of Gelex turbidity standards.
Answer
Hach Company does not typically assign an expiration date to the Gelex Standards because of the way the product is designed. It is a plastic part that does not deteriorate. It is a secondary standard in which the customer establishes an actual concentration based on a primary standard, Formazin.
If you must report an expiration date for regulatory purposes, please state 10 years from the date you received these vials.