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 / Particle Standards
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Poly(ethylene glycol)
Order No. Details Nominal MW Description PDI Packsize
PSS-pegkit picture_as_pdf Kit Poly(ethylene glycol), 10 x 0.5 g, Mp 106 - 44 000 Da
PSS-pegkitval picture_as_pdf LCCCValid Validation Kit, 6 x 3 and 3 x 4 Vials-1.5ml
LCCCValid LCCCValid Validation Kit, 6 x 3 and 3 x 4 Vials-1.5ml and Validation Column
PSS-pegkitvala picture_as_pdf 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 picture_as_pdf ReadyCal-Kit Poly(ethylene glycol), 3 x 10 Vials-1.5ml, Mp 232 - 44 000 Da
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Poly(alpha-methylstyrene)
Order No. Details Nominal MW Description PDI Packsize
PSS-amskit picture_as_pdf Kit Poly(alpha-methylstyrene), 10 x 1.0 g, Mp 1 580 - 932 000 Da
PSS-ams1.5k picture_as_pdf 1500 Poly(alpha-methylstyrene) <1,50 1000,00
PSS-ams2k picture_as_pdf 2000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams4k picture_as_pdf 4000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams6k picture_as_pdf 6000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams8k picture_as_pdf 8000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams16k picture_as_pdf 16000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams29k picture_as_pdf 29000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams35k picture_as_pdf 35000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams40k picture_as_pdf 40000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams60k picture_as_pdf 60000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams70k picture_as_pdf 70000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams110k picture_as_pdf 110000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams200k picture_as_pdf 200000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams230k picture_as_pdf 230000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams280k picture_as_pdf 280000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams430k picture_as_pdf 430000 Poly(alpha-methylstyrene) <1,15 1000,00
PSS-ams850k picture_as_pdf 850000 Poly(alpha-methylstyrene) <1,15 1000,00
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Deuterated polymers
Order No. Details Nominal MW Description PDI Packsize
PSS-pcd50k picture_as_pdf 49800 Poly(carbonate-d4) broad 1,78 1000,00
PSS-peode3.5k picture_as_pdf 3500 Poly(ethylene oxide-d4) 1,11 1000,00
PSS-peode6k picture_as_pdf 6000 Poly(ethylene oxide-d4) 1,07 1000,00
PSS-peode33k picture_as_pdf 33000 Poly(ethylene oxide-d4) 1,10 1000,00
PSS-mmd4k picture_as_pdf 3860 Poly(methyl methacrylate-d8) 1,12 1000,00
PSS-mmd20k picture_as_pdf 19900 Poly(methyl methacrylate-d8) 1,10 1000,00
PSS-mmd35k picture_as_pdf 35200 Poly(methyl methacrylate-d8) 1,10 1000,00
PSS-mmd230k picture_as_pdf 230000 Poly(methyl methacrylate-d8) 1,11 1000,00
PSS-mmd580k picture_as_pdf 580000 Poly(methyl methacrylate-d8) 1,11 1000,00
PSS-ppmd100k picture_as_pdf 102900 Poly(para-methylstyrene-d10) 1,08 1000,00
PSS-pssd44k picture_as_pdf 44000 Poly(styrene sulfonate-d8) sodium salt <1,20 1000,00
PSS-pssd145k picture_as_pdf 145000 Poly(styrene sulfonate-d8) sodium salt <1,20 1000,00
PSS-pssd1.5m picture_as_pdf 1500000 Poly(styrene sulfonate-d8) sodium salt <1,20 1000,00
PSS-psdt160k picture_as_pdf 158000 Poly(styrene-d3) 1,04 1000,00
PSS-psde2k picture_as_pdf 2090 Poly(styrene-d8) 1,06 1000,00
PSS-psde3k picture_as_pdf 3100 Poly(styrene-d8) 1,05 1000,00
PSS-psde4.3k picture_as_pdf 4330 Poly(styrene-d8) 1,04 1000,00
PSS-psde6k picture_as_pdf 5940 Poly(styrene-d8) 1,05 1000,00
PSS-psde7k picture_as_pdf 6870 Poly(styrene-d8) 1,04 1000,00
PSS-psde12k picture_as_pdf 12300 Poly(styrene-d8) 1,05 1000,00
PSS-psde16k picture_as_pdf 16000 Poly(styrene-d8) 1,02 1000,00
PSS-psde26k picture_as_pdf 26300 Poly(styrene-d8) 1,02 1000,00
PSS-psde27k picture_as_pdf 27100 Poly(styrene-d8) 1,06 1000,00
PSS-psde40k picture_as_pdf 39600 Poly(styrene-d8) 1,04 1000,00
PSS-psde50k picture_as_pdf 49400 Poly(styrene-d8) 1,03 1000,00
PSS-psde80k picture_as_pdf 80000 Poly(styrene-d8) 1,02 1000,00
PSS-psde130k picture_as_pdf 132000 Poly(styrene-d8) 1,02 1000,00
PSS-psde160k picture_as_pdf 163000 Poly(styrene-d8) 1,03 1000,00
PSS-psde175k picture_as_pdf 174000 Poly(styrene-d8) 1,03 1000,00
PSS-psde185k picture_as_pdf 185000 Poly(styrene-d8) 1,05 1000,00
PSS-psde310k picture_as_pdf 307000 Poly(styrene-d8) 1,06 1000,00
PSS-psde376k picture_as_pdf 376000 Poly(styrene-d8) 1,06 1000,00
PSS-psde600k picture_as_pdf 598000 Poly(styrene-d8) 1,11 1000,00
PSS-psde807k picture_as_pdf 807000 Poly(styrene-d8) 1,27 1000,00
PSS-psde830k picture_as_pdf 828000 Poly(styrene-d8) 1,16 1000,00
PSS-psde938k picture_as_pdf 938000 Poly(styrene-d8) 1,26 1000,00
PSS-psde985k picture_as_pdf 985000 Poly(styrene-d8) 1,31 1000,00
PSS-psde1.24m picture_as_pdf 1240000 Poly(styrene-d8) <1,50 1000,00
PSS-psde1.28m picture_as_pdf 1280000 Poly(styrene-d8) <1,50 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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