571 Badge Formaldehyde Background Level

571 Badge Formaldehyde Background Level

When a Lot of 571 badges is manufactured, a representative number of badges are tested for background levels of formaldehyde and other significant interferences.  For formaldehyde background, the average and standard deviation of the background levels must pass established criteria before the lot is approved for customer use.  The average value of the formaldehyde background is listed below.  Laboratories that use and resell our badges to their customers can use the values below to blank correct their results or just verify their lab is getting the same level of background.

All media that collects formaldehyde has some background formaldehyde.  Since Assay Technology manufactures our media inside of glove boxes filled with Nitrogen gas, the background levels are very low and consistent.

571 Badge Formaldehyde Background Level

Lot Expiration Date Initial Background Level, ug 6 Month Shelf Life Background Level, ug
2C23 02/29/24 0.029 0.035
3H23 03/31/24 0.029 0.027
4C23 04/30/24 0.036 0.033
6L23 06/30/24 0.032 0.030
9A23 09/31/24 0.052 0.064
10L23 10/31/24 0.049 0.065
1B24 01/31/25 0.040 0.054
3A24 03/31/25 0.040 0.030
4B24 04/30/25 0.043 0.093
6B24 06/30/25 0.038 0.084
7C24 07/31/25 0.016
9I24 09/30/25 0.00033
10C24 10/31/25 0
11G24 11/30/25 0.026
12B24 12/31/25 0.066
Note 1:  The lot number format is Month/Letter/Year.  So Lot 1C11 was produced in January 2011.
Note 2: For each lot, Assay Technology tests a set of aldehyde monitors to assure the level of formaldehyde is within acceptance limits.   A background level of 0.0046 ppm is 0.6% of the PEL.  The background of formaldehyde for a specific lot is subtracted from all samples tested at AT Labs.