Microscratch　responses　of　four　different　thermoplastics　including　polytetrafluoroethylene,　polyethylene,　polyvinyl　chloride,　and　polyetheretherketone　were　investigated　under　constant　normal　load　by　Berkovich　indenter　with　the　focus　on　quantifying　effects　of　sliding　speed　and　normal　load　on　scratch　variables　such　as　penetration　depth,　elastic　recovery　rate,　contact　scratch　hardness,　residual　scratch　hardness,　lateral　hardness,　width　of　residual　groove,　and　scratch　friction　coefficient.　The　results　show　that　penetration　depth　is　more　sensitive　to　sliding　speed　than　lateral　force,　and　power　law　functions　are　applicable　to　describe　dependences　of　scratch　variables　on　sliding　speed　and　normal　load.　Correlations　between　scratch　variables　and　mechanical　properties　such　as　yield　strength　and　Meyer　hardness　are　also　discussed,　and　contact　scratch　hardness　is　linearly　correlated　with　yield　strength,　Meyer　hardness,　and　elastic　recovery　rate.　©　2023,　ASM　International.