Varian NHS-35, Instruction Manual, Page: 27 / 49

Installation
1-7
f. For reassembly, reverse the above procedure.
g. Clean the flanges and O-ring grooves thoroughly with alcohol, using clean, lint-free rags.
WARNING
Diffusion pumps are typically cleaned with acetone, alcohol, or other
solvents.
When heated, sprayed or exposed to high temperature equipment,
these solvents become flammable and explosive, causing serious injury
or death. Do not use near a high-temperature source. Ventilate work-
ing area with a blower and use in large, well-ventilated room. When
heated or sprayed, solvents also become 4 to 5 times heavier than air
and will flow down, settling in tanks, pits, and low areas, thus displacing
air which can kill by asphyxiation. Use in a large, well-ventilated room.
Use of a self-contained breathing apparatus may be necessary.
Acetone, alcohol, and other solvents are irritants, narcotics, depres-
sants, and/or carcinogenics. Their inhalation and/or ingestion may pro-
duce serious effects. Prolonged or continued contact with the skin will
result in absorption through the skin and moderate toxicity. Always
ensure that cleaning operations are carried out in large, well-ventilated
rooms, and wear eyeshields, gloves, and protective clothing.
CAUTION
Acetone, alcohol, and other solvents degrade O-ring materials reducing
their ability to hold a vacuum. Do not use solvents on O-rings. If neces-
sary to clean O-rings, wipe with lint-free, clean cloth, wash in detergent
and water, or use a small amount of pump oil.
h. Remove all traces of acetone or alcohol by carefully drying with clean, dry, oil-free
compressed air. Install O-ring gasket.