When Purity is Essential
Why
not go first class?
If your work requires high purity gases, why not use the best? Matheson Research Grade gases are the purest available. They are now supplied in our new ICC-approved high pressure cylinder that is far safer and more convenient than the so-called throw-away kind. Equipped with Standard CGA Connections. No deposit, no demurrage. Ordinary Regulators Contaminate. Our No. 18 and 19 regulators were specially designed for high purity and Research Grade gas service. They have diffusion resistant metal diaphragms to prevent the contamination that often occurs with ordinary "welding type" regulators. They are equipped for direct attachment to cylinders with provisions for options on outlet connections. Use A Good Valve. It's surprising how many researchers are using common needle valves. Our chromed brass 939 BT packless control valve attaches directly to the cylinder, provides positive seating, eliminates leakage. No " 0 " rings or packing to create diffusion problems. For further information on our Research Grade gases and handling equipment, write for Matheson Catalog 25. We invite you to consult our Engineering Department concerning the design of high purity gas systems or other compressed gas problems. P.O. Box 85, East Rutherford, New Jersey Plants in East Rutherford, N. J.; Joliet, III.; La Porte, Texas, Morrow, Ga.; Newark, Calif. / Matheson of Canada, Whitby, Ont,
fi£ I X / I A T H E S O N
No. 939 BT Valve No. 18 Regulator N o . 19 Regulator
54
C&EN
MATHESON RESEARCH GRADE NEON
