At the top of the side of the tube there is a number from which you can read it.
For example, it says here: 1038-6345 326

The first number (1) is day of the week = Monday.
The second and third numbers (03) indicate the week = week 3.
The fourth number (8) denotes the year = 2018.
Behind the hyphen (-) is the internal batch code: 6345.
The single numbers behind it indicate the tube number from the relevant batch.

So this is a tube that was produced on Monday, week 3 of 2018
Batch: 6345 and the 326th tube from the cockpit.

The average shelf life of an MS Polymer is at least 12 months but often up to 24 months.
In the industry it is said: does it still come out of the box, is it still good?