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
9Q18 09/30/18 0.036 0.030
12B18 12/31/19 0.023 0.027
2F19 02/28/20 0.029 0.034
4H19 04/30/20 0.028 0.028
7A19 07/31/20 0.022 0.027
9B19 09/30/20 0.031 0.029
11A19 11/30/20 0.026 0.024
12D19 12/31/20 0.026 0.034
3F20 03/31/20 0.038 0.041
5C20 05/31/21 0.055 0.048
9C20 09/30/21 0.030 0.038
12A20 12/31/21 0.052 0.056
3F21 03/31/22 0.042 0.030
4A21 04/30/22 0.046 0.038
6J21 06/30/22 0.047 0.038
8A21 08/31/22 0.037 0.039
10B21 10/31/22 0.044 0.046
11K21 11/30/22 0.040 0.050
12A21 12/31/22 0.035 0.039
1L22 01/31/23 0.035 0.039
2J22 02/28/23 0.036 0.037
4N22 04/30/23 0.033 0.033
7B22 07/31/23 0.031
9G22 09/30/23 0.033
10G22 10/31/23 0.032
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.