emco GPRSmoothness Tester according to Bekk

The emco GPR is a smoothness tester according to Bekk for paper with automatic compensation of air pressure.

The smoothness or roughness is a substantial surface property of papers, cardboard and cartons. The quality of the surface structure has a great influence on the printability and any form of coating. The Bekk smoothness is a method established in the paper industry based on air flow. The slower the air flows between the paper surface and the ideal plane, the higher the smoothness, expressed in the Bekk smoothness seconds. The shape, the total volume as well as the distribution of the cavities at the contact surface are decisive for the smoothness.

In contrast to PPS and Bendtsen, a representative paper area of approximately 10 cm² is tested in the Bekk method.

Fulfilled standards

  • DIN 53107: 2016-05 Testing of paper and paperboard – Determination of smoothness according to Bekk
  • TAPPI T 479 cm-09 Smoothness of paper (Bekk method)
  • ISO 5627: 1995, confirmed in 2016 Paper and board – Determination of smoothness (Bekk method)

New standard DIN 53107: 2016-05 with a physically necessary complement to compensate the ambient air pressure.

All emco GPR devices meet the air pressure compensation since 2004.


  • Compensation of measured values of air pressure, required in DIN 53107: 2016-05
  • Two measuring ranges (standard volume and 1/10 volume)
  • Density test and calibration mode is menu-driven
  • Supervision and registration of the test climate


  • Quality assurance
  • Production control
  • Research and development


  • Decor paper
  • Photo paper
  • Cigarette paper
  • Specialty papers

Technical data

Measuring range

15 to 600 Bekk s

Volume standard

380 ml, 10 ml

Volumen fast measuring

38 ml, 1 ml

Working range

  • Standard mode: 10 to 1400 Bekk s
  • Fast mode: 80 to 1400 Bekk s

Operating conditions

18 – 25 °C; 30 – 70 % humidity

Power connection

230 V, 50 Hz / 110 V, 60 Hz

Compressed air

not necessary

Dimension (LxWxH)

500 mm x 400 mm x 520 mm


45 kg

Product information

Downloads / Documents

Product request

* Mandatory fields
* Mandatory fields

Further products

emco PPA – Paper Testing Automat

Configurable, compact testing automates for fully automatic proof of cross-sections of paper, paper board and carton for the use in testing laboratories and on the machine

emco IBT Internal Bond Tester

Determination of splitting strength of the structure of paper, paper board, compound systems, etc. according to TAPPI and ISO

emco PZS Sample Cutting

Lever cutting machine with mounted measuring caliper for fast production of test strips for standard-compliant paper testing

emco PTM 5 – Thickness measuring device

Battery-powered, electronic mobile measuring device for the determination of the thickness of non-metal materials, such as papers, textiles, veneers, wood, leather, rubber, plastic and glass