What is the shelf life for pH buffers?

Document ID

Document ID TE3070

Version

Version 2.0

Status

Status Published

Published Date

Published Date 17/04/2019
Question
What is the shelf life for pH buffers?
Summary
pH buffer shelf life.
Answer
Shelf life of any Hach product (in reference to the expiration date printed on the package) is of an unopened bottle stored in the conditions also indicated on the packaging.

Hach pH 7 buffer has a shelf life of two years from manufacture date of an unopened bottle.
Hach pH 4 buffer has a shelf life of two years from manufacture date of an unopened bottle.
Hach pH 10 buffer has a shelf life of one year from manufacture date of an unopened bottle.

Shelf life of a bottle once opened is impossible to determine due to environmental variations specific to the customer location and storage standard operating procedures. (Elevation/pressure for example.) We recommend that the date the bottle is opened is written on the bottle and that the standards be used within six months for pH 4 and 7 buffers, or three months for pH 10 buffer.