Abstract
Samples of rubber (Hevea brasiliensis) and mango (Mangifera indica) wood treated with 2.5%, 5%, 7.5% and 10% aqueous solution of Chromic acid were assessed for water repellency and dimensional stability. Significant reduction in water absorption in treated samples was observed in initial five hours of soaking in water compared to untreated controls. It was found that effectiveness of water repellency was independent of concentration of solution under repeated cycles of wetting and drying. Degree of water repellency that could be achieved by chromic acid treatment appears to be dependent on constituents of wood.
Zusammenfassung
Holzproben vonHevea brasiliensis undMangifera indica wurden mit wässriger Chromsäure (2,5%, 5%, 7,5% und 10%) behandelt und darauf ihre Feuchtebeständigkeit und Dimensionsstabilität untersucht. Die Behandlung führte zu einer deutlich verringerten Wasseraufnahme während der ersten 5 Stunden der Tränkversuche. Bei wiederholtem Befeuchten und Trocknen erwies sich die wasserabweisende Wirkung als unabhängig von der Konzentration. Der Grad der erreichbaren Feuchtebeständigkeit hängt dagegen vor allem von den chemischen Bestandteilen des Holzes ab.
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References
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Chauhan, S.S., Aggarwal, P.K., Karmarkar, A. et al. Water repellency in treatedHevea brasiliensis andMangifera indica wood. Holz als Roh-und Werkstoff 55, 203–205 (1997). https://doi.org/10.1007/BF02990548
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DOI: https://doi.org/10.1007/BF02990548