Back in 2018, I got this urgent call from a copper smelting plant in Anhui - their temperature monitoring was all over the place during the night shift. Turns out the bargain-bin insulating sleeves they'd been using couldn't handle the thermal shock from rapid furnace cycling. We drove out there at 2 AM and found the sleeves had cracked, causing erratic thermocouple readings that nearly ruined a whole batch of product. That's when we switched them to NBRAM's mica sleeves. The difference was night and day - suddenly their temperature readings stabilized, production quality improved, and they stopped losing sleep over inconsistent batches. If your temperature measurements are giving you grief in high-heat applications, it might be time to source proper Mica Insulating Sleeve For Thermocouple that can actually withstand real industrial conditions.