When you work in a lab with biological material or with chemicals:

– Always wear protective gloves.

– Prefer nitrile gloves to latex.
Latex might be allergenic and is porous to a wide range of chemicals
in solution, in particular to ethidium bromide.

– Use gloves conformed to the European Norm EN374.
The norm EN374 tells you that the gloves have passed the minimal standards for the penetration test (waterproofness) and permeation
test (resistance to chemicals).
The norm EN374/2 indicates that the glove conform to a least a performance level 2 for the penetration test. Level 2 means that less than 1.5% of the gloves have failed the test.
The norm EN375/3 indicates that the glove can resist at least 30 minutes to three chemicals indicated by the three letters code.

The ‘Micro-organism’ pictogram is to be used when the glove conforms to at least a performance level 2 for the Penetration test.
The ‘Low Chemical resistant’ or ‘Waterproof ’ glove pictogram is to be used for those gloves that do not achieve a breakthrough time of at least 30 minutes against at least three chemicals from the defined list, but which comply with the Penetration test.
The ‘Chemical resistant’ glove pictogram must be accompanied by a 3-digit code. This code refers to the code letters of 3 chemicals (from a list of 12 standard defined chemicals – Table below), for which a breakthrough time of at least 30 minutes has been obtained.

© Ansell

You can consult the site Gloves selection guide to find out which glove material is suitable for a defined chemical product.

Finally, when you leave the lab, keep one hand free of gloves to touch handles, lift button, etc.