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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Order No. Details Nominal MW Description PDI Packsize
PSS-dxt180 picture_as_pdf 180 Dextran =1,00 500,00
PSS-dxt342 picture_as_pdf 342 Dextran =1,00 500,00
PSS-dxt504 picture_as_pdf 504 Dextran =1,00 500,00
PSS-dxt1.3k picture_as_pdf 1300 Dextran <1,50 500,00
PSS-dxt5k picture_as_pdf 5000 Dextran <2,00 500,00
PSS-dxt10k picture_as_pdf 10000 Dextran <2,00 500,00
PSS-dxt20k picture_as_pdf 20000 Dextran <2,00 500,00
PSS-dxt25k picture_as_pdf 25000 Dextran <2,00 500,00
PSS-dxt40k picture_as_pdf 40000 Dextran <2,00 500,00
PSS-dxt70k picture_as_pdf 70000 Dextran <2,00 500,00
PSS-dxt80k picture_as_pdf 80000 Dextran <2,00 500,00
PSS-dxt130k picture_as_pdf 130000 Dextran <2,00 500,00
PSS-dxt200k picture_as_pdf 200000 Dextran <2,00 500,00
PSS-dxt320k picture_as_pdf 320000 Dextran <3,00 500,00
PSS-dxtb1.5m picture_as_pdf 1500000 Dextran broad/branched >2,00 1000,00
PSS-dxtb2m picture_as_pdf 2000000 Dextran broad/branched >2,00 1000,00
PSS-dxtkit picture_as_pdf Kit Dextran, 10 x 0.25 g, Mp 180 - 225 000 Da
PSS-dxtkitr1 picture_as_pdf ReadyCal-Kit Dextran, 3 x 5 Vials-1.5ml, Mp 180 - 298 000 Da
PSS-vlskitr1dxt10 picture_as_pdf ReadyVLS-Kit, Dextran, 10 Vials-1.5ml
PSS-dxtval picture_as_pdf Standardkit (aqueous), 6 x 5 Vials-1.5 ml, for EasyValid Validation Kit
PSS-dxtkitv picture_as_pdf Visco/LS-Kit Dextran, 4 x 0.5 g, Mp 8 500 - 202 000 Da

Organic Mobile Phase

Product Download

Material safety data sheet: SDS


Material safety data sheet: SDS


Material safety data sheet: SDS

Poly(carbonate) broad

Material safety data sheet: SDS

Poly(dimethyl siloxane)

Material safety data sheet: SDS


Material safety data sheet: SDS

Poly(ethylene terephthalate)

Material safety data sheet: SDS

Poly(ethyl methacrylate)

Material safety data sheet: SDS


Material safety data sheet: SDS


Material safety data sheet: SDS


Material safety data sheet: SDS

Poly(methyl methacrylate)

Material safety data sheet: SDS

Poly(n-butyl methacrylate)

Material safety data sheet: SDS


Material safety data sheet: SDS

Poly(t-butyl methacrylate)

Material safety data sheet: SDS

Poly(t-butyl acrylate)

Material safety data sheet: SDS

Poly(2-vinylpyridine) org.

Material safety data sheet: SDS

Poly(vinyl chloride)

Material Safety Data Sheet: SDS


Material safety data sheet: SDS

Poly(propylene glycol)

Material safety data sheet: SDS

Specialties / Particle Standards

Product Download
Random copolymers

A selection of random copolymers with different compositions.

Block copolymers

A large selection of block copolymers with different chemistries and compositions.

Deuterated polymers

A selection of deuterated polymers. Material safety data sheet: SDS

Functionalized polymers

Reference materials with specific end groups or without initiator. Material safety data sheet: SDS

Star polymers

A selection of star branched polymers with 3 arms.

Particle standards

Certified Particle Size Standards for particle sizing instruments  (Nanospheres and Microspheres), and Standards for particle counting instruments (EZY-CAL)

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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