Selecting the Proper Gloves
The correct gloves protect the hands against contact with chemicals; the wrong gloves enhance chemical contact. The type of glove used should be chosen to be compatible with the particular chemicals being used. There is no universal glove that protects you from all chemicals. To choose the correct glove go to a Glove Reference Chart. (see below)
Disposable gloves provide minimal protection and should be used with this in mind If using concentrated solvents, corrosives or toxics is likely, more heavy-duty gloves should be worn. These provide more protection, but have the drawback of being more cumbersome. Note also that about 15% of the population is allergic to latex http://www.cdc.gov/niosh/latexalt.html to some degree.
Check gloves before use for signs of wear or penetration. Disposable gloves can be inflated by mouth to check for pinholes. When removing gloves, be careful to avoid touching the outside of the gloves with your bare hands. Always remove gloves before leaving the lab.
All gloves are permeable, only the rate of permeation varies, depending on the chemical, the glove material and thickness, temperature, concentration gradient, etc. However, once a material begins to permeate the glove, it will continue until an equilibrium is reached. You must, therefore, decide when it is appropriate to discard contaminated gloves.
Glove Reference Charts (No guarantees are made regarding the accuracy of these charts. Recommend checking at least two sites.)
http://www.des.umd.edu/ls/gloves.html (U of Maryland)
http://www.pp.okstate.edu/ehs/hazmat/perm-a.htm (U of Oklahoma)