Testing dielectric gloves is critical for safety when working with electricity. Here's a proper testing procedure combining daily pre-use inspection, air inflation testing, and mandatory periodic electrical testing:
1. Pre-Use Visual & Air Inflation Test (Before EVERY Use)
Step 1: Check Expiration Date: Verify the current date is within the 6-month certification period marked on the glove. Never use expired gloves.
Step 2: Visual Inspection: Examine every inch for:
Cuts, tears, punctures, embedded objects
Cracks, ozone damage (checking/cracking), UV degradation
Chemical damage (swelling, softening, hardening, discoloration)
Stitching issues, rolled cuffs
Step 3: Air Inflation Test (Roll Test):
Trap air by rolling the glove cuff tightly towards the fingers.
Squeeze the rolled-up body gently to pressurize the fingers/palm.
Hold near your ear and listen for hissing (air leaks).
Visually watch for bulging indicating thinning or weak spots.
Rotate and repeat to test all areas thoroughly.
Repeat for the second glove.
2. Formal Electrical Proof Testing (Every 6 Months - Mandatory)
Performed ONLY by: Certified labs (e.g., OSHA/NAIL accredited in the US).
Process:
Water Bath: Gloves are filled with water and submerged in a conductive water bath.
Conductor: A conductor is placed inside the glove (connected to high voltage).
Voltage Application: AC or DC voltage (per ASTM standards) is applied between the internal conductor and the bath water.
Leakage Current Measurement: Current flow through the glove material is monitored.
Pass/Fail Criteria: Must NOT exceed maximum allowable leakage current for the glove class (e.g., Class 00: 6 mA max @ 2,500V AC) and must NOT flash over.
Result: Gloves are marked with test date and voltage rating. A certificate is issued.
3. Important Testing Rules
Frequency: Electrically test every 6 months without exception (OSHA 1910.137, ASTM F496).
After Incident: Test immediately after any shock, physical damage, or suspicion of compromise.
Never Field-Test: Applying voltage yourself is extremely dangerous and invalid.
Re-Test Failed Gloves: Failed gloves must be destroyed or permanently marked "DEFECTIVE".
Record Keeping: Maintain test certificates for inspection.
4. Additional Checks
Leather Protectors: Inspect separately for cuts, wear, and secure fit over the rubber glove.
Storage: Check gloves were stored properly (away from light, heat, ozone, chemicals, sharp objects).