Flammability and Tribological Properties of Pine Sapwood, Reinforced with Sodium Metasilicate and Non-food Oil

  • Edita GarskaiteEmail author
  • Dalia Brazinskiene
  • Svajus Asadauskas
  • Lars Hansson
  • Dick Sandberg
Conference paper


Modification of Scots pine (Pinus sylvestris L.) sapwood using aqueous formulations of Na2SiO3 via vacuum-pressure technique and subsequent treatment with cashew nut-shell liquid (CNSL) is reported. Morphology, elemental distribution within wood matrix, and structural properties of wood-composites were investigated by FE-SEM/EDS, FTIR analysis. Microstructure and density of modified wood blocks were further assessed by X-ray computed tomography. The flammability of Na2SiO3-CNSL-wood composites was evaluated simultaneously performing thermogravimerical (TG) and FTIR gas analysis; the results showed that maximum weight loss for the modified wood was obtained at up to 70 °C lower temperatures compared to the untreated wood, whilst substantially reducing terminal weight losses. The coefficient of friction significantly increased after the CNSL treatment compared to that of untreated wood, but addition of Na2SiO3 to CNSL eliminated most of the friction increase. Enhanced tribological properties along with industrial wood-impregnation method suggest that wood modification using Na2SiO3 in combination with CNSL has a potential for the exploration of a broader range of wood material properties in agreement with sustainable material management.


Scots pine Na2SiO3 Computed tomography Tribology 



The work has been partially supported by the Swedish Research Council FORMAS (grant no. 2018-01198) and IPOS (No. DP2 BFAST AP4 Brand) projects.


  1. 1.
    Donath S, Militz H, Mai C (2004) Wood modification with alkoxysilanes. Wood Sci Technol 38:555–566CrossRefGoogle Scholar
  2. 2.
    Pfeffer A, Mai C, Militz H (2012) Weathering characteristics of wood treated with water glass, siloxane or DMDHEU. Eur J Wood Wood Prod 70:165–176CrossRefGoogle Scholar
  3. 3.
    Adetogun AC, Adegeye AO, Omole AO (2009) Evaluation of Cashewnut Shell Liquid (CNSL) as a wood preservative using weight loss. Agric J 4:32–35Google Scholar
  4. 4.
    Hansson L, Couceiro J, Fjellner B-A (2017) Estimation of shrinkage coefficients in radial and tangential directions from CT images. Wood Mater Sci Eng 12:251–256CrossRefGoogle Scholar
  5. 5.
    Raudoniene J, Laurikenas A, Kaba MM, Sahin G, Morkan AU, Brazinskiene D, Asadauskas S, Seidu R, Kareiva A, Garskaite E (2018) Textured WO3 and WO3:Mo films deposited from chemical solution on stainless steel. Thin Solid Films 653:179–187CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Edita Garskaite
    • 1
    Email author
  • Dalia Brazinskiene
    • 2
  • Svajus Asadauskas
    • 2
  • Lars Hansson
    • 3
  • Dick Sandberg
    • 1
  1. 1.Wood Science and EngineeringLuleå University of TechnologySkellefteåSweden
  2. 2.FTMC Tribology LaboratoryVilniusLithuania
  3. 3.Department of Ocean Operations and Civil Engineering, Faculty of EngineeringNorwegian University of Science and TechnologyÅlesundNorway

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