Overview
- University of Michigan researchers reporting in March 2026 found that residues on widely used nitrile and latex gloves can be misread as microplastics in standard lab tests.
- Tests that mimicked routine handling showed averages near 2,000 false signals per square millimeter, with some glove types topping about 7,000, and most of the look‑alike particles were smaller than 5 micrometers.
- The culprit is stearate salts added during glove manufacturing to release gloves from molds, which produce light‑based “fingerprints” that closely match polyethylene in vibrational spectroscopy.
- Cleanroom gloves made without stearates released far fewer particles, and the authors advise avoiding glove contact when safe or switching to stearate‑free gloves when protection is required.
- The team also developed methods and spectral libraries to separate glove‑derived signals from true plastics, urging rechecks of past datasets while stressing that real microplastic pollution still exists.