00000caa a22000003i 4500 UP-1685594773862388520 Buklod 20210318091712.0 m | | ta 210318s2018 xx r |||| u|eng d (iLib)UPBAG-00039513710 STII-DOST BAG rda eng ARTICLE-2711 Mari, Erlinda L. author. Spent tea leaves as extender and scavenger for urea formaldehyde-bonded plywood by Erlinda L. Mari, Juanito P. Jimenez, Jr., and Rebecca B. Lapuz. 2018. pages 285-291 color illustrations 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (pages 290-291) In lieu of wheat flour, spent tea leaves (STL) from the manufacture of tea-flavored drink was mixed with urea formaldehyde (UF) resin to produce an adhesive for 5-mm-thick plywood. Three glue mixes (GM1, GM2, and GM3) were formulated using three STL levels (3.4%, 6.8%, 10.2% by mass). GM1 had no catalyst and coconut shell flour/filler; GM2 had no catalyst but had a filler; while GM3 had a catalyst but no filler. The glue manufacturer?s recommended formulation was used for making the control plywood. All glue mixes were formulated with the same total resin solids. The effect of the STL on the various glue mixes was evaluated in terms of the plywood?s shear strength & wood failure (PNS ISO 12466-1:2016 & PNS ISO 12466-2:2016), and formaldehyde emission (PNS ISO 12460-4:2016). Results indicated that GM3, or complete replacement of wheat flour and coconut shell flour with STL both as extender and filler in the plywood glue mix, was the best formulation. It did not adversely affect the panel?s strength properties. Moreover, formaldehyde emission was significantly reduced by 36 to 60%. Chemistry. Extender. Formaldehyde emission. Plywood. Shear strength. Spent tea leaves. Lapuz, Rebecca B. author. Jimenez, Jr., Juanito P. author. The Philippine Journal of Science Vol. 147, no. 2, June 2018. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 16 March 2021) FI UPBAG UPBAG-MAIN ARTICLE-2711 Analytics