Which fluid we use in shock absorber?

My answer to Which fluid we use in shock absorber?

Answer by Arûn Râinâ:

A shock absorber (in reality, a shock "damper") is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. A shock absorber is a type of dashpot.

there have been many liquids tested for usein hydraulic systems. Currently, liquids being usedinclude  mineral  oil,  water,  phosphate  ester,water-based  ethylene  glycol  compounds,  and silicone  fluids. The  three  most  common  types  of hydraulic liquids are petroleum-based, syntheticfire-resistant,  and  water-based  fire-resistant.

PETROLEUM-BASED  FLUIDS: The  most  common  hydraulic  fluids  used  inshipboard systems are the petroleum-based oils.These fluids contain additives to protect the fluidfrom  oxidation  (antioxidant),  to  protect  systemmetals  from  corrosion  (anticorrosion),  to  reducetendency of the fluid to foam (foam suppressant),and  to  improve  viscosity.

SYNTHETIC  FIRE-RESISTANT  FLUIDS:Petroleum-based  oils  contain  most  of  thedesired properties of a hydraulic liquid. However,they are flammable under normal conditions andcan  become  explosive  when  subjected  to  highpressures and a source of flame or high tempera-tures. Nonflammable synthetic liquids have been developed for use in hydraulic systems where fire hazards exist.

Phosphate Ester Fire-Resistant Fluid: Phosphate  ester  fire-resistant  fluid  for shipboard  use  is  covered  by  specification  MIL- H-19457.  There  are  certain  trade  names  closely associated  with  these  fluids.  However,  the  only acceptable fluids conforming to MIL-H-19457 are the ones listed on the current Qualified Products List (QPL) 19457. These fluids will be delivered in  containers  marked  MIL-H-19457C  or  a  later specification  revision.  Phosphate  ester  in containers  marked  by  a  brand  name  without  a specification  identification  must  not be used in shipboard  systems,  as  they  may  contain  toxic chemical


As  a  maintenance  person,  operator,  supervisor, or  crew  member  of  a  ship,  squadron,  or  naval shore  installation,  you  must  understand  the hazards associated with hydraulic fluids to which you  may  be  exposed.

Which fluid we use in shock absorber?


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