viscoLAB: your clever way to analyze

viscotec's technical center features a fully equipped laboratory to ensure the highest material quality. The viscoLAB offers customers the possibility to follow their material- and process quality continuously during the test runs and in the follow-up process.


The viscoLAB provides the customers a variety of material testing services.

viscoLAB benefits:

  • Documented quality assessment acc. to GMP
  • Regular quality control
  • Strengthening your position towards suppliers
  • Compact material analysis and structured report

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viscotec viscolab roast test

Identification of contaminants

By heating up PET flake samples discoloration of its contaminants is achieved. Impurities like PVC, glue, polyolefins etc. can be optically detected and quantified.

viscotec viscolab color test

Color test

Color measurement of rPET (amorphous PET after extrusion and/or crystalline PET after SSP) according to the L*a*b*- system. These three color values are decisive for the application.

viscotec viscolab surface moisture test

Surface moisture test

PET pellets or flakes are heated up to 160 °C so that the surface moisture vaporizes. The moisture content is calculated by relating the starting to the final weight of the sample.

viscotec viscolab gas chromatography

GC – gas chromatographic analysis

Detection and quantification of the typical rPET substances Acetaldehyde (AA) and Limonene. A report including the chromatogram is provided.

iV – intrinsic viscosity test


Laboratory procedure for iV measurement of PET. The right procedure is crucial especially when testing iV of post-consumer bottle flakes to ensure precise and valuable results. viscotec offers basic and advanced training to our customers in order ensure precise measurement and quality control.



viscotec viscolab instrinsic viscosity test

iV – intrinsic viscosity test

Pre-dried PET flakes and pellets are melted and pressed with a defined pressure through a defined die at a certain temperature. The flow speed determines the iV value.

Prices & packages

Service Package of 10 tests
Flakes roast test € 900,-
Color test € 300,-
Surface moisture test € 300,-
iV measurement € 500,-
GC analysis € 1.300,-
Complete package deals     
1. Flakes € 2.900,-
2. Pellets (without roast test) € 2.000,-
viscotec viscolab gas chromatography team
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