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Biodegradable lightweight construction boards based on tannin/hexamine bonded hemp shaves

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, with a dry I.B. strength of up to 0.34 MPa, a formaldehyde release well within the emission class E1 and certificate as normal flammable and not burning dripped off (DIN 4102-B2) were fabricated by mixing hemp shaves with a borate-modified mimosa tannin-hexamine binder and press the masses as fast as 6 s/mm thickness at 70°C to one-layer boards. Different drying processes indicate that fast drying at ˜100°C is needed both for satisfactory strengths and for a sufficient dimension stability performance of soaked samples, but, as well for a lower boron leaching during soaking. For dry environments the resistance to fungal attack is sufficient enough to have boards for interior application.

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verpresst. Querzugfestigkeiten bis zu 0.34 MPa, Formaldehyd-Emissionen die innerhalb der Emissionsklasse E1 liegen und Brandschutzeinstufungen als normal entflammbar und nicht brennend abtropfend (DIN 4102-B2) wurden bestimmt. Verschiedene Trocknungsprozesse zeigen, dass schnelles Trocknen bei ˜100°C zu höheren Festigkeiten und, nach wässern der Proben, zu ausreichender Dimensionstabilität bei geringerer Borauswaschung führt. Für trockene Umgebungen ist die Resistenz gegen Pilzbefall ausreichend genug um die Bretter für Innenanwendungen einzusetzen.

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Theis, M., Grohe, B. Biodegradable lightweight construction boards based on tannin/hexamine bonded hemp shaves. Holz als Roh- und Werkstoff 60, 291–296 (2002). https://doi.org/10.1007/s00107-002-0306-0

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  • DOI: https://doi.org/10.1007/s00107-002-0306-0

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