IRG Documents Database and Compendium


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The use of new, aqueous chemical wood modifications to improve the durability of wood-plastic composites
2017 - IRG/WP 17-40787
The wood flour used in wood-plastic composites (WPCs) can biologically deteriorate and thus the overall mechanical performance of WPCs decrease when exposed to moisture and fungal decay. Protecting the wood flour by chemical modification can improve the durability of the wood in a nontoxic way so it is not harmful to the environment. WPCs were made with modified wood flour and then evaluated for moisture sorption, fungal resistance and mechanical performance. Two different chemical modifications at 2 different levels were used: organosilicate (OS, 1% and 2.5%) and cobalt sulfate (CoS, 2.5% and 5%). All modifications had less weight loss than the unmodified controls with the 2.5% OS blend showing no weight loss from decay by either brown or white rot fungi. Water soaking for 1-week at elevated temperature (70°C) was more aggressive for laboratory decay and mechanical testing as shown by higher weight loss and lower mechanical properties compared to 2-week water soaking at room temperature (23°C). Moisture exposure decreased the mechanical properties, but 2.5% OS, 2.5% CoS and 5% CoS had better performance than the unmodified controls and 1% OS after 70°C conditioning and decay.
R E Ibach, C M Clemons, G C Chen


Minutes of the meetings of WG II
1983 - IRG/WP 2207
IRG Secretariat


Agenda WG II
1989 - IRG/WP 2337
IRG Secretariat


Minutes of the WG II meetings 1974
1974 - IRG/WP 241
IRG Secretariat


Agenda WG II
1974 - IRG/WP 237
IRG Secretariat


IRG Working Group II. Co-operative leaching test (letter to collaborators)
1974 - IRG/WP 240
J W W Morgan


Agenda WG II
1981 - IRG/WP 2158
IRG Secretariat


Minutes of the WG II meetings 1975
1975 - IRG/WP 256
IRG Secretariat


Agenda WG II
1990 - IRG/WP 2352
IRG Secretariat


Minutes of the WG II meetings 1976
1976 - IRG/WP 274
IRG Secretariat


Minutes of the meetings of WG II
1984 - IRG/WP 2231
IRG Secretariat


Minutes of the meetings of WG II
1989 - IRG/WP 2340
IRG Secretariat


Minutes of the meetings of WG II
1982 - IRG/WP 2191
IRG Secretariat


Efficacy of anhydrides as wood protection chemicals - II. Performance against soft rot fungi
1998 - IRG/WP 98-30174
Pine sapwood modified with various anhydrides and with butyl isocyanate was tested for its resistance to soft rot decay. Small stakes were exposed for 20 months in unsterile soil in a fungal cellar test. Wood modified with butyl isocyanate performed better than any of the anhydrides tested, with a threshold level of protection (less than 3% weight loss) at 12% weight percent gain (WPG). Stakes acetylated to 15% WPG did not give complete protection against soft rot. Stakes modified with alkenyl succinic anhydride showed increasing resistance to soft rot with WPG up to about 10% WPG, above which no further improvements were evident. Succinic anhydride and phthalic anhydride treated stakes showed little or no noticeable protection.
S C Forster, M D C Hale, G R Williams


IRG Working Group II. Co-operative leaching tests
1973 - IRG/WP 230
J W W Morgan


Fire resistance of Alder wood treated with some chemicals. Part II. Effect of Other Chemicals on the Combustion Properties
2002 - IRG/WP 02-40235
Samples from alder wood (Alnus glutinosa (L.) Gaertn. subsp. barbata (C.A.Mey) Yalt.) were impregnated according to ASTM D 1413-88 with boron compounds (boric acid, borax, sodium perborate), vinyl monomers (styrene, methyl methacrylate), Tanalith-CBC, Phosphoric acid, Vacsol, Immersol, Polyethylene glycole (PEG-400) and their mixed solutions of chemicals in order to determine their combustion properties. The results indicated that inorganic boron compounds with aqueous solutions were very effective as fire retardant and reduced burning of some vinyl monomers at some extent such as styrene and methylmetacrylate when used as a secondary treatment chemical polimerized later on wood structure and phosphoric acid was also showed fire-reterdancy. Further studies are suggested on boron-vinyl monomers, and boric acid+borax with different concentrations by physical and chemical interactions in terms of fire reterdancy.
A Temiz, Ü C Yildiz


Agenda WG II
1977 - IRG/WP 276
IRG Secretariat


Agenda WG II
1983 - IRG/WP 2203
IRG Secretariat


Agenda WG II
1984 - IRG/WP 2227
IRG Secretariat


Programme WG II
1992 - IRG/WP 92-2415
IRG Secretariat


Minutes of the Meeting of WG II 1971
1971 - IRG/WP 205
IRG Secretariat


Minutes of the Meeting of WG II 1969
1969 - IRG/WP II 2
IRG Secretariat


Agenda WG II
1991 - IRG/WP 2386
IRG Secretariat


Minutes of the meetings of WG II
1981 - IRG/WP 2165
IRG Secretariat


Agenda WG II
1988 - IRG/WP 2313
IRG Secretariat


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