HagenKB

Test Kits have Loose Caps

The cap is loose on my test kit's test tube

The cap is loose on my test kit's test tube
The cap may seem too small for the test tubes, but this was done for a reason. The cap has been designed to prevent liquid splash-over when removing the cap from the tube after shaking.

The cap is the correct size to provide a good seal when shaken with a finger or thumb applying pressure to the top while agitating the liquid. But there have been many problems in the past with splashing when a fully sealed cap is used. The cap was carefully designed cap to slide easily in and out of the test tube. This prevents any backsplash resulting from difficulty in removing the cover due to vacuum or a tight seal. Any liquid caught between the cap and the tube will naturally flow back into the tube rather than splashing up and out onto the hands or clothing.

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