American Polymer Standards Corporation

Providing Molecular Weight Determination Services, Polymer Standards and GPC Columns since 1983

 

 

 

Accuracy of Various Molecular Weight Determination Methods

Method of Determination Standard Error of Estimate
Mw by LALLS (Mw above 50,000) +/- 5 to 10 %
Mw by LALLS (Mw below 50,000) +/- 10 to 15 %
Mn by LALLS +/- 20 to 30 %
Mw by MALLS (Mw above 50,000) +/- 3 to 10 %
Mw by MALLS (Mw below 50,000) +/- 10 to 15 %
Mn by MALLS +/- 20 to 30 %
Mn by Membrane Osmometry (Mw above 50,000) +/- 5 to 10 %
Mn by Vapor Pressure Osmometry (Mw 15,000 - 30,000) +/- 10 to 15 %
Mn by Vapor Pressure Osmometry (Mw below 15,000 ) +/- 2 to 5 %
Mw by GPC/SEC +/- 3 to 10 %
Mn by GPC/SEC +/- 10 to 15 %
Mz by GPC/SEC +/- 10 to 15 %
Mp by GPC/SEC +/- 3 to 10 %
Mw by GPC/DV Universal Calibration +/- 5 to 10 %
Mn by GPC/DV Universal Calibration +/- 10 to 15 %
Mz by GPC/DV Universal Calibration +/- 10 to 15 %
Mp by GPC/DV Universal Calibration +/- 5 to 10 %
Mn by End Group Analysis (Mw below 10,0000) +/- 10 to 15 %
Mz by Ultra Centrifuge (Mw above 10,000) +/- 10 to 15 %
Mv by Viscotek Viscometer Y501-C +/- 5 to 10 %
Intrinstic Viscosity by Viscometer Y501-C +/- 5 to 10 %