For most chemical applications that operate in the rough vacuum range (down to 1 mbar), diaphragm pumps are a top pick.
Why? Because they're oil-free, eco-friendly, and they don't produce waste water or waste oil.
For applications demanding an even lower pressure in the fine vacuum range (down to o 10^-3 mbar), like freeze drying or Schlenk lines, you need rotary vane pumps .
Rotary vane delivers an ultimate vacuum of 2 x 10^-3 mbar. However, they do require oil for lubrication and sealing, which can sometimes interfere with sensitive processes. Plus, regular oil changes are a must.
Vacuum System, PC3016 NT VARIO Model, Adaptive Controller, 70 Ultimate Vacuum mbar, 53 Ultimate Vacuum Torr, 11.4 Free Air Capacity at 60 Hz cfm, 322 Free Air Capacity at 60 Hz lpm, 120 V, 60 Hz, Improved Productivity
Tubing, 10' L, 1.5 ID x 2" OD, Clear, Tygon, 0.25" Wall Thickness, 6" Minimum Blend Radius, 65 and 50 psi Maximum Working Pressure, 25 and 5 psi Vacuum Rating, 2275 I.B. Series, Plasticizer free, Non-toxic, Low Sorption
Tubing, 500' L Coil, 0.01 ID x 0.03" OD, Crystal Clear, Tygon, 0.01" Thickness, 30 ga Needle, S-54-HL Series, Autoclavable, Compatible with Blood, Reduced Flexibility, Non-toxic
Tubing, 50' L, 0.0625 ID x 0.1875" OD, Clear, Tygon, 0.0625" Thickness, 0.5" Minimum Blend Radius, 35 psi Maximum Working Pressure, XL-60 Series, Chemical Resistance, Flexible, Low Extractable
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Biocompatible Tubing, 25' L, 0.020 ID x 0.145" OD, Silicone, 0.0625" Thickness, 0.125" Minimum Blend Radius, 115 psi at 73°F & 72 psi at 180°F Maximum Working Pressure, For Peristatic Pumps and Cell Culture
Tubing, 50' L, 0.125 ID x 0.25" OD, Black, Tygon, 0.0625" Thickness, 0.375" Minimum Blend Radius, 60 psi Maximum Working Pressure, R-3400 Series, Chemical Resistance, Ozone Resistant