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PSS Perfect Separation Solutions > Products > Reference Materials > Standards Sorted by Type

Molecular Weight Standards, GPC/SEC Calibration Kits and Validation Standards

PSS supplies certified standards that meet the requirements of DIN 55672 and ISO/EN 13885. All reference materials are characterized with GPC/SEC to obtain molecular weight values. These values are subsequently confirmed by alternative methods such as Laser Light Scattering, Viscometry, MALDI-ToF, VPO and NMR.

Each product comes with a Certificate of Analysis, which provides the characterization information, the testing parameters, the molecular weight values (Mn, Mw, Mp, PDI) and the chromatogram. Calibration kits include a calibration report.

Products Sorted by Type - Click on the Material to open the Product List

  • Aqueous Mobile Phase
  • Organic Mobile Phase
  • Specialties
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Poly(ethylene glycol)
Order No. Details Nominal MW Description PDI Packsize
PSS-pegkit Kit Poly(ethylene glycol), 10 x 0.5 g, Mp 106 - 44 000 Da
PSS-pegkitval LCCCValid Validation Kit, 6 x 3 and 3 x 4 Vials-1.5ml
PSS-pegkitvala LCCCValid Validation Kit, PEG Standards, 10 x 3 Vials-1.5ml
PSS-PEG62 picture_as_pdf 62 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG106 picture_as_pdf 106 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG150 picture_as_pdf 150 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG194 picture_as_pdf 194 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG200 picture_as_pdf 200 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG238 picture_as_pdf 238 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG282 picture_as_pdf 282 Poly(ethylene glycol) =1,00 1000,00
PSS-PEG330 picture_as_pdf 330 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG400 picture_as_pdf 400 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG600 picture_as_pdf 600 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG1K picture_as_pdf 1000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG1.5K picture_as_pdf 1500 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG2K picture_as_pdf 2000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG3K picture_as_pdf 3000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG4K picture_as_pdf 4000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG6K picture_as_pdf 6000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG10K picture_as_pdf 10000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG12K picture_as_pdf 12000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG18K picture_as_pdf 18000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG22K picture_as_pdf 22000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG26K picture_as_pdf 26000 Poly(ethylene glycol) <1,25 1000,00
PSS-PEG42K picture_as_pdf 42000 Poly(ethylene glycol) <1,30 1000,00
PSS-pegkitr1 ReadyCal-Kit Poly(ethylene glycol), 3 x 10 Vials-1.5ml, Mp 232 - 44 000 Da
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Poly(isobutylene)
Order No. Details Nominal MW Description PDI Packsize
PSS-pibkit Kit Poly(isobutylene), 10 x 0.25 g, Mp 390 - 674 000 Da
PSS-PIB112 picture_as_pdf 112 Poly(isobutylene) =1,00 250,00
PSS-PIB390 picture_as_pdf 390 Poly(isobutylene) <1,30 250,00
PSS-PIB680 picture_as_pdf 680 Poly(isobutylene) <1,30 250,00
PSS-PIB1K picture_as_pdf 1000 Poly(isobutylene) <1,30 250,00
PSS-PIB2.1K picture_as_pdf 2100 Poly(isobutylene) <1,30 250,00
PSS-PIB3K picture_as_pdf 3000 Poly(isobutylene) <1,30 250,00
PSS-PIB4.7K picture_as_pdf 4700 Poly(isobutylene) <1,30 250,00
PSS-PIB7.2K picture_as_pdf 7200 Poly(isobutylene) <1,30 250,00
PSS-PIB12K picture_as_pdf 12000 Poly(isobutylene) <1,30 250,00
PSS-PIB16K picture_as_pdf 16000 Poly(isobutylene) <1,30 250,00
PSS-PIB21K picture_as_pdf 21000 Poly(isobutylene) <1,30 250,00
PSS-PIB24K picture_as_pdf 24000 Poly(isobutylene) <1,30 250,00
PSS-PIB30K picture_as_pdf 30000 Poly(isobutylene) <1,30 250,00
PSS-PIB47K picture_as_pdf 47000 Poly(isobutylene) <1,30 250,00
PSS-PIB70K picture_as_pdf 70000 Poly(isobutylene) <1,30 250,00
PSS-PIB80K picture_as_pdf 80000 Poly(isobutylene) <1,30 250,00
PSS-PIB100K picture_as_pdf 100000 Poly(isobutylene) <1,30 250,00
PSS-PIB120K picture_as_pdf 120000 Poly(isobutylene) <1,30 250,00
PSS-PIB210K picture_as_pdf 210000 Poly(isobutylene) <1,80 250,00
PSS-PIB600K picture_as_pdf 600000 Poly(isobutylene) <1,80 250,00
PSS-PIB700K picture_as_pdf 700000 Poly(isobutylene) <1,80 250,00
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Random copolymers
Order No. Details Nominal MW Description PDI Packsize
PSS-PSMM133K picture_as_pdf 133000 Poly(styrene-methyl methacrylate) 10/90 1,57 1000,00
PSS-PSMM100K picture_as_pdf 103000 Poly(styrene-methyl methacrylate) 20/80 1,27 1000,00
PSS-PSMM86K picture_as_pdf 85800 Poly(styrene-methyl methacrylate) 45/55 1,91 1000,00
PSS-PSMM87K picture_as_pdf 87700 Poly(styrene-methyl methacrylate) 51/49 1,63 1000,00
PSS-PSMM51K picture_as_pdf 50700 Poly(styrene-methyl methacrylate) 83/17 1,49 1000,00

Polydispersity Index, PDI

The Polydispersity Index, PDI, is a measure of the width of the molar mass distribution. It is defined as ratio of the weight average molar mass Mw and the number average molar mass Mn, PDI =Mw/Mn.

PDI is 1 for monodisperse substances (no molar mass distribution), it is larger than 1 for the vast majority of all macromolecules. The PDI depends on the polymerization technique applied to produce the material. In praxis the PDI can be very large up to values of 100 and above. Narrow PDIs can only be obtained using controlled/living polymerization techniques.

Please refer to the literature section to learn more.

  • Narrow Standards
  • Broad Standards

Narrow polymer standards are made by controlled/living polymerization techniques (living anionic/cationic, ATRP, RAFT, etc.) or by fractionation of very broad standards.

All narrow standards have small polydispersity indices and exhibit a sharp and slim chromatographic profile.

The Mp value (molar mass at the peak maximum) is well defined and independent on the column resolution. As Mp is the only clearly defined point in the chromatogram this value is used to establish GPC/SEC calibration curves.

Standards with a narrow molar mass distribution are used:

  • to construct a GPC/SEC calibration curve using the provided Mp values
  • for the validation of a chromatographic system
  • for the determining of physical constants

Broad reference materials are made by radical polymerization, polycondensation or coordinative polymerization (polyolefins).

The PDI of broad standards is usually > 1.5. For broad standards the Mp value is a function of the column resolution. Molar mass values provided for broad standards are thus only the average molar masses Mw and Mn.

Modern GPC/SEC software packages allow for the construction of a calibration curve by the use of Mw, Mn or the intrinsic viscosity [η] of broad standards.


Standards with a broad molar mass distribution are used:

  • to validate a chromatographic system
  • to determine physical constants such as the Mark-Houwink constants K and ∝
  • to construct a calibration curve using broad calibration options
  • to test for porosity mismatch
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