Carbon steel without coating – General purpose for non-corrosive and non-oxidizing liquids.

Carbon steel with protective internal coating – This internal coating protects against UV,

abrasion and corrosion, and should be specified for water applications such as river water, service

water, cooling water, clear run water from sewage treatment facilities, etc.

 

304 Series stainless steel – Widely available, good general corrosion resistance, good cryogenic

toughness. Excellent formability and weldability.

 

316 Series (L and Ti) stainless steel – Widely available, good general corrosion resistance, good

cryogenic toughness. Excellent formability and weldability.

 

Polyamide (filter element end caps) – General-purpose polymer (amide) for use in applications

such as hydraulics and pneumatics. Resistant to oils, hydraulic fluids, water fuels, gases, petroleum

oils, cold water, silicone greases and oils Di-ester base lubricants (MIL-L-7808) ethylene glycol base

fluids (Hydrolubes) not suited for use in brake fluids. Good abrasion resistance. Good resistance to

compression set. High tensile strength. Characteristics: Stable plastic. Dull, matte finish.

 

PTFE / Teflon^® (a registered trademark of DuPont Dow Elastomers) – General-purpose thermoplastic

(Polytetrafluoroethelyene) for use as a low friction, insulating product that is inert to most chemical

substances.

 

Buna N / NBR (nitrile) – General-purpose elastomer for use as seal energizer or low-pressure

applications such as hydraulics and pneumatics. Resistant to oils, hydraulic fluids, water fuels, gases,

petroleum oils, cold water, silicone greases and oils. Di-ester base lubricants (MIL-L-7808) ethylene

glycol base fluids (Hydrolubes) not suited for use in brake fluids. Good abrasion resistance. Good

resistance to compression set. High tensile strength. Characteristics: Rubber-like elastomer. Dull,

matte finish. Some NBR o-rings have a very shiny surface.

 

Silicone – General-purpose elastomer for use as seal material. Resists water and many chemicals such

as some acids, oxidizing chemicals, ammonia and isopropyl alcohol. Note: concentrated acids, alkalines

and solvents should not be used with silicone rubber. Characteristics: Soft rubber-like elastomer. High

tear and tensile strength, good elongation, excellent flexibility.

 

Viton^®  (a registered trademark of DuPont Dow Elastomers) – Widely available elastomer for use

as seal energizer or low-pressure applications such as process fluids, hydraulics and pneumatics.

Highly resistant to many aggressive fluids such as fuels and chemicals. Characteristics: Rubber-like

elastomer. ISO 9000 registration.

 

EPDM (Ethylene Propylene Diene) – Versatile and widely used synthetic rubber recognized for its

resistance to heat, oxidation, weather, and electricity. Compatible with water, acids, alkalies,

phosphate esters, and many ketones and alcohols.

 

Cleaning Reusable Filter Elements – The cleaning methods for the reusable elements depend upon 
the type of service and the filter element design. The individual cleaning methods described here 
can be combined to achieve better results. It is not advisable to attempt most of these cleaning methods 
without the proper equipment and training. There are competent organizations best suited for this type of 
work. Upon request, we will provide a cleanliness certificate, including the results of a bubble-point test as 
well as the clean and fully laden element weights.

 

Pyrolysis – This method is based upon the removal of organic materials imbedded within the

element. Organic material is vaporized at high temperature in an oxygen-depleted atmosphere. Exact

control of the temperature and oxygen content is required to avoid damage to the element of the

possibility of flame generation.

 

Vacuum Pyrolysis – This method is based upon the removal of plastic materials imbedded within

the element using a two-step process. Organic material is vaporized at high temperature in an

oxygen-depleted atmosphere within a vacuum chamber. In this process the material to be removed

is melted into liquid and evacuated via vacuum in the first step, then further heating vaporizes the

remaining material in the second step. Exact control of the vacuum, temperature and oxygen content

is required to avoid damage to the element of the possibility of flame generation.

 

Boil Off – This method is based upon a process similar to a commercial dishwasher. Constant flowing

of a flushing liquid (typically a solvent) at high temperature ensures removal of particles.

 

High Pressure Wash – This method is used mainly for the removal of coarse particles from the filter

elements. It can be a manual or automatic process depending on the equipment available. A standard

high pressure using water or water-based solvents can be used taking care not to damage the

element. The wash direction must be consistent with the flow direction of the element.

 

Ultrasonic Cleaning – This method utilizes an ultrasonic bath, which easily loosens the particles
imbedded in the filter element. Using water with a detergent additive, a 20 to 40 Hz frequency is 
recommended. Solvents other than standard detergents can be used also.