New manufacturing methodology for boron-based rods for remedial treatments of wood: solubilities and some physical and thermal properties of the rods

Creative Commons License

Aydin S., TERZİ E., Kartal S. N., PİŞKİN S., Depren S. K., Figen A. K.

SN APPLIED SCIENCES, vol.2, no.11, 2020 (ESCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 2 Issue: 11
  • Publication Date: 2020
  • Doi Number: 10.1007/s42452-020-03593-2
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus, INSPEC
  • Yıldız Technical University Affiliated: Yes


Boron-based rods are ideal for remedial treatments in wood attacked by decay fungi, insects and termites as well as for preventive treatments of high-risk areas in structural timbers and logs internally. This study evaluated the solubility, some physical and thermal properties of the boron-based rods manufactured from either raw ulexite mineral, raw cole-manite mineral, di-sodium octa borate tetrahydrate (DOT), and their combination of silica-based plasticizer. This is the first attempt to produce ulexite and colemanite-based boron rods with/without additional compound by an extruder. To take the advantages of boron minerals, rods were produced with paste mixtures of boron compounds and plasticizer by a single-screw extrusion method. Solubility and thermal resistance tests as well as micro-hardness tests were performed to determine the quality and strength of the rods for discussing the on-site applications. The paste content was an important factor affecting the transport processes during single screw extrusion with special emphasis on the rod formation. No macro-structural changes were observed when the boron rods were exposed to heat at 30, 50, 70, 100, and 200 degrees C. According to the Kruskal-Wallis test, no significant difference was observed in micro-hardness values of thermally treated boron-based rods; however, at high temperatures up to 50 degrees C, there was a decrease in hardness of DOT rods. The rods manufactured by extrusion methods showed similar water solubility when compared to raw ulexite and colemanite minerals.