公开(公告)号：US11686719B2

公开(公告)日：2023-06-27

申请号：US17467019

申请日：2021-09-03

申请人： Michael M. Khonsari ,  Lijesh Koottaparambil

发明人： Michael M. Khonsari ,  Lijesh Koottaparambil

IPC分类号： G01N33/28 ,  G01N1/10 ,  G01N1/28 ,  G01N13/02

CPC分类号： G01N33/2888 ,  G01N1/10 ,  G01N1/28 ,  G01N13/02 ,  G01N2001/1031 ,  G01N2013/0208

摘要： Methods of evaluating viscous compositions are disclosed. The methods may be used to evaluate degradation levels of lubricants including grease. The methods may include preparing a surface for testing by leveling and flattening a viscous composition, placing a drop of a liquid on the flattened leveled surface, evaluating the observed contact angle between the drop and the surface, and then comparing the observed contact angle to a reference contact angle.