Research & development in the field of pelletizing, mobilization of biomass resources    
DI Wilfried Pichler (DW -16, Email)

Testing, inspection and certification of wood pellets, fuel testing    
DI Andreas Haider (DW -66, Email)  

Standardisation, quality of wood chips    
DI Monika Steiner (DW -912, Email)

Different biofuels
Ring die pelletpress
Wood chips produced on the basis of biomass from forestry
Example of raw material
Probe für Wassergehaltsanalyse
Receipt and acceptance of energy wood: Sampling with modified chain saw
Device for testing the mechanical durability of pellets (Tumbler)
Sieve stack
Determination of water content in drying oven
Flat die pelletpress / pan grinder mill
Belt dryer
Refining station



The specialized division “Bioenergy” focuses on the production, the properties, the logistics and the market of solid biofuels, in particular wood-based biofuels. This encompasses wood pellets, wood briquettes as well as certain assortments of round wood, wood chips and hog fuel which are suitable for energetic utilisation. Partners are producers and traders of biofuels, technology providers in the field of biomass-based fuel processing and suppliers of additives or measuring instruments.

Research and Development

Process optimisation and product quality improvement in biomass processing and utilisation


Since spring 2013 Holzforschung Austria runs a state of the art biomass pilot plant in which R&D questions regarding processing and optimized utilisation of solid biomass are examined. Different technologies for separation of impurities, comminution and pelletizing are at place for R&D as well as industrial scale tests and are connected to modern measuring instruments. We aim for an international top-ranking position in the field of biomass research.

Know-how in the field of wood chips and hog fuel for energetic use

The development and implementation of the OENORM C 4005 standard for wood chips and hog fuel for energetic use was actively supported and practically promoted by Holzforschung Austria in the last years. These activities were supported by an Austria-wide screening of wood chip samples in the course of the project "ChipClass" which was initiated by cooperative platform Forest-Wood-based Panels-Paper - FHP and accomplished by Holzforschung Austria.

Inspection, certification and testing of biofuels

Holzforschung Austria is accredited for inspection, certification and testing of biofuels. This includes wood pellets, wood briquettes, wood chips and hog fuel as well as other solid biofuels. The following certification schemes and testing methods are within our scope:

Inspection of wood pellets and wood briquettes

  • ENplus® - Quality Certification Scheme For Wood Pellets (August 2015)
  • DINplus - Certification Scheme for wood pellets for use in small furnaces (Juni 2015)

OENORM EN ISO 17225-3 - Solid biofuels - Fuel specifications and classes - Part 3: Graded wood briquettesFor the programs stated above the specialized division “Bioenergy” performs both the inspection audits of the production sites and the obligatory fuel testing and analysis. 

ENplus®-certification of wood pellets

  • ENplus® - Quality Certification Scheme For Wood Pellets (August 2015)

For this internationally established certification scheme Holzforschung Austria is working as accredited certification body. With the combined inspection and certification by Holzforschung Austria our customers realize advantages, both regarding competent consulting on their way to obtain the ENplus® certificate and also regarding a cost-effective certification process. This makes Holzforschung Austria the top choice for the ENplus certification of wood pellets. 

>>> List of ENplus® certificate holders

Inspection of receipt and acceptance of energy wood

  • FHP „Richtlinie zur Übernahme von Energieholz nach Gewicht und nach Energieinhalt“

Holzforschung Austria controls the process of receipt and acceptance of wood fuel in the course of regular inspections at heating plants and CHP plants, which contributes to transparency between buyer and seller of wood fuel assortments. 

Accredited fuel testing

All quality parameters of OENORM EN ISO 17225-2 for wood pellets as well as OENORM EN ISO 17225-3 for wood briquettes are analysed by Holzforschung Austria and our accredited partner laboratories. Based on these analyses Holzforschung Austria issues accredited test reports for the quality of pellets and briquettes. Several fuel quality parameters can of course be analysed for wood chips and hog fuel as well, additionally for these fuels a particle size classification (sieving analysis) is possible. The following analyses are carried out within our fuel quality tests:

OENORM CEN/TS 15370-1:

Determination of ash melting behaviour

OENORM EN ISO 18134-2:

Determination of water content


Determination of ash content


Determination of net calorific value


Determination of bulk density


Determination of carbon, hydrogen and nitrogen


Determination of content of fines (e.g. in pellet samples)

OENORM EN ISO 17827-1 / -2:

Particle size classification (sieving analysis of wood chips and hog fuel)


Determination of particle density of briquettes

OENORM EN ISO 17831-1:

Determination of mechanical durability of pellets


Determination of sulphur and chlorine


Determination of arsenic, lead, cadmium, chromium, copper, mercury, zinc and nickel


Determination of the dimensions of pellets and briquettes

Upon request, together with the specialized division "Analytical Chemistry / Measurement of emissions" we can carry out special analyses like content of starch, content of volatile organic matter (VOC), content of volatile matter or content of ash producing elements (Ca, Mg, K, Fe, Na, Al). 

Further services

The specialized division “Bioenergy” offers training courses for the correct receipt and acceptance of energy wood for the staff of heating plants and CHP plants. 

Expert’s reports can be provided upon request and cover the areas fuel quality, fuel logistics and fuel receipt and acceptance. Special requests are examined in cooperation with other specialized divisions of Holzforschung Austria.  

Holzforschung Austria is very much involved in the process of standardisation and places the interests of industry and trade in the relevant discussion processes. In national and international standardisation projects for the development of standards for solid biofuels Holzforschung Austria participates actively.

Special facilities

Biomass pilot plant

Holzforschung Austria runs a comprehensively equipped biomass pilot plant where test runs for biomass utilisation and upgrading can be performed. The following machines can be used for this purpose separately, but also in various combinations to examine whole process chains:




Ring die pelletpress, industrial scale

Salmatec Anlagenbau GmbH

Pelletizing of biomass raw materials for huge test quantities

Ring die pelletpress, laboratory scale

CPM (California Pellet Mill)

Pelletizing of biomass raw materials for exploratory analyses

Flat die pelletpress / Pan Grinder Mill

Amandus Kahl GmbH & Co. KG

Preparation and pelletizing of biomass raw materials

Refining station

Albert Knoblinger GesmbH / ACO

Testing of additives and raw material blends

Belt dryer

Andritz / Heiza

Setting up a defined water content of biomass raw materials, technical dehydration

Four-shaft shredder

Untha shredding technology

Rough comminution of biomass raw materials

Hammer mill

Tietjen Verfahrenstechnik GmbH

Comminution of biomass raw materials to produce material suitable for pelletizing

Impurity separator

Teccon, Mesutronic

Separation of stones and other impurities from biomass raw materials

Sieve and washing station


Dry and wet sieving and washing of biomass raw materials


Biomass laboratory

Holzforschung Austria has an own, state of the art biomass laboratory for the accredited analysis of all the relevant fuel quality parameters stated above.