"Minor irritation" on an old sheet could be "liver damage" on today's sheet.
Setting: A large copper mining operation in Arizona, USA. The date is a sweltering Tuesday in July. The concentrator plant uses NALCO 8539, a molybdenum disulfide-based lubricant additive, for its high-pressure ball mill bearings. nalco 8539 msds
That same night, Leo, the night supervisor, needed to unclog a metering pump. He didn't read the new SDS. He remembered Jim saying it was "just grease." To save time, he didn't grab the chemical goggles or the apron. He simply cracked the line open. "Minor irritation" on an old sheet could be
"Jim! Stop," Maria said, holding up the new SDS. "You need nitrile gloves and a Tyvek sleeve for that." The concentrator plant uses NALCO 8539, a molybdenum
Jim scoffed. "Kid, I've been bathing in this stuff since before you were born. It’s just grease. The old sheet said 'minor irritation.' My hands are calloused—I’m fine."
Maria was doing her weekly SDS binder audit. She stopped at the tab for Inside, she found a faded, 15-year-old MSDS printed on yellowed paper. The format was old—it didn’t have the required 16-section GHS format, and the pictograms were barely legible.
Maria didn't argue. Instead, she showed him Section 11 (Toxicological Information). She read aloud: "Repeated dermal exposure can cause cumulative liver damage. Symptoms are delayed—fatigue, jaundice, dark urine. It’s a sensitizer, too. First time, no reaction. Second time? Your skin explodes in hives."