TWA
Time-weighted average
An exposure limit averaged over a work shift.
Where it appears
- Alnico permanent-magnet alloy
- Aluminium alloy 2014
- Aluminium alloy 6082
- Aluminium alloy 7050
- Antimony
- Beryllium copper
- Beryllium oxide
- Beryllium
- Cadmium
- Chromium-rich binary alloys
- Cobalt-iron and cobalt intermetallic alloys (Co-Fe, Co-Ti, Co-W, Co-Al)
- Cupronickel 70/30
- Ethylene-chlorotrifluoroethylene
- Ferroalloys (steelmaking master alloys)
- Gallium arsenide
- Graphite
- Hafnium oxide
- Hafnium
- Inconel X-750
- Kevlar para-aramid fibre
- Lead alloys other than antimonial lead (Pb-Sn-Ag, Pb-Sn-Sb, Pb-Bi, Pb-Se)
- Magnesium oxide (magnesia)
- Manganese
- Molybdenum carbide
- Nickel aluminide
- Nickel oxide
- Lithium nickel manganese cobalt oxide
- Permendur (Hiperco 50)
- Pyrolytic graphite
- Pyrophyllite
- Rhodium
- Self-reinforced polymer composites and aramid composites
- Selenium
- Silver alloys (brazing, silver-gold and contact alloys)
- Stainless steel 301
- Stainless steel 431
- Tellurium
- Tinned copper
- Titanium dioxide
- Tungsten trioxide
- Vanadium pentoxide
- Vanadium
- Zinc oxide
Related terms
- SDS Safety data sheet
About this definition
General background written for readers. No open source is attached to this definition yet. If you know a good one, you can suggest it.