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under conditions of heavy load and low speed a thick film of lubricant cannot work ,under these conditions,boundary lubrication occurs.in other words ,this type of lubrication cannot persist ,and metal metal direct contact is possible for some reasons.such a situation develops when 1)the viscosity of oil is low 2)the load is fairly high 3)the viscosity of oil is low 4)a shaft starts moving from rest

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Q: Why boundary lubricants is used?
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