Solid Biofuels Laboratory


CARTIF Biofuels Testing Laboratory was created in 2005, aimed at supporting biofuels related to energy use in R&D projects and offering to biomass stakeholders an accredited service for testing and quality evaluation of solid biofuels, as an answer to current demand of bioenergy sector. Nowadays Biofuels testing Lab has many customers, such as biofuels producers and traders, public entities and other R&D centers, among others, in a wide scope (regional, national and international).

Since 2015, in accordance with technical requirements and European testing standards, CARTIF is the first Spanish testing body recognized as an accredited Laboratory for solid biofuel testing, according to ENAC accreditation 335/LE1276. Furthermore, CARTIF is currently the only Spanish accredited testing body in full scope for ENplus® certification squeme for wood pellets for non-industrial use (ISO 17225-2), and is listed by European Pellet Council as testing body for certification of wood pellets within the ENplus® system.

CARTIF Testing Lab offers a fast and effective service, adapted to customers needs in biofuels testing aimed at evaluation, monitoring and quality control, according to standard ISO 17225 for solid biofuels.

Analysis and Tests:


Note: test marked with * are not covered by ENAC accreditation

Proximate Analysis

  • Total moisture , according to ISO 18134-1:2023
  • Moisture in general analysis sample, according to EN ISO 18134-3:2023
  • Volatile matter, accorging to ISO 18123 *
  • Fixed carbon (calculated) *
  • Ash content, according to ISO 18122:2022

Ultimate Analysis

  • arbon, according to ISO 16948
  • Hydrogen, according to ISO 16948
  • Nitrogen, according to ISO 16948
  • Sulphur, according to ISO 16994
  • Chlorine, according to ISO 16994
  • Oxygen (calculated) *

Energy Analysis

  • High Heating Value (HHV), according to ISO 18125
  • Low Heating Value (LHV); according to UNE-EN ISO 18125:2018

Quality determination of pellets

  • Bulk density, according to ISO 17828:2016
  • Particles density; according to ISO 18847*
  • Mechanical durability, according to ISO 17831-1
  • Fine particles content, according to ISO 18846
  • Coarse fine particles (3,15 mm ≤ FP < 5,6 mm), according to UNE-EN ISO 18846:2017*
  • Size: diameter and length of pellets, according to ISO 17829
  • Portion of pellets with length < 10 mm according to ENplus® Guidance Document *
  • Particle size distribution of disintegrated pellets, according to ISO 17830 *
  • Particle density of pellets , according to ISO 18847 *

Minor elements

  • As, Cd, Cr, Cu, Hg, Ni, Pb y Zn, according to ISO 16968

Quality determination of solid biofuels ashes

  • Ash melting behaviour in (oxydizing and reducing atmosphere), according to CEN/TS 15370-1
  • Shrinkage starting temperature (SST)
  • Deformation temperature (DT)
  • Hemisphere temperature (HT)
  • Flow temperature (FT)
  • Determination of major elements , according to ISO 16967 *

Other services in solid fuels

  • Water soluble sodium and potassium content (Na+K), according to ISO 16995 *
  • Determination of particle size distribution for uncompressed fuels, according to UNE EN ISO 17827-1 and/or UNE EN ISO 17827-2 *
  • Biomass content in solid recovered fuels , according to ISO 15440 *
  • Thermogravimetric Analysis (TGA) and Differential thermal analysis (DTA). Decomposition profiles in inert and oxidizing atmosphere *
  • Chromatographic analysis of decomposition gas (H2, O2, N2, CO, CO2, CH4, C2H4, C2H6, C3H8) *
  • Kinetic processes. Determination of kinetic parameters in thermal decomposition processes *
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