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Although API gravity is mathematically a dimensionless quantity
Made for 55 Gallon Drums
and fuel quality control
hydrogen chlorine
They have grooves on the brass side adjacent to the PHENOLIC scale as recommended by API
North Full Face Respirator, Dual Cartridge (7600) Size:Medium/Large Although API gravity is mathematically7600 series is made of 100% silicone which offers better comfort, fitness and safety compared with 7700 half mask. Can also be used with PAPR or supplied air respirators to fit different using environments. With specially designed oral nasal cup to lessendead space , avoid rebreathing in of exhaled CO2 and reduce the working fatigue of wearers. 7600 also offers a speaking diaphragm to amplify voices and make communication easy. Dual facial seal design
