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Increasing adhesive choices in engineered wood products that meet market requirements

https://library.fpinnovations.ca/fr/permalink/fpipub41381
Auteur
Pirvu, Ciprian
Date
March 1907
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Alberta Forestry Research Institute
Date
March 1907
Genre du document
Research report
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Materials
Adhesives
Série
W-2481
Localisation
Vancouver, British Columbia
Langue
English
Résumé
Test results for three representative adhesives were obtained for use in the development of a proposed standard for limited moisture exposure (CSA O112.10). The adhesives tested were an emulsion polymer isocyanate (EPI), a polyurethane (PUR) and a melamine-urea formaldehyde with 40% melamine resin content (MUF40). Currently, EPI and PUR are used for I-joists and fingerjoined lumber. MUF40 was included in the study as a non-conforming adhesive. The range of performance of these adhesives, along with that of melamine formaldehyde (MF) and polyvinyl acetate (PVA) evaluated in a previous study, is baseline information used in defining acceptable performance levels for adhesives undergoing block shear tests required in the proposed standard. Specimens in this study were evaluated under five test conditions: dry, vacuum-pressure wet or re-dried, and three-cycle boil-dry-freeze wet or re-dried. Dry and re-dried test conditions are the proposed test protocols for the draft CSA O112.10 standard. In terms of shear strength and percentage of wood failure, EPI and MUF40 met the requirements of CSA O112.9 for the dry test condition, and PUR did not. The following block shear test requirements are recommended for CSA O112.10, based on the 95% lower confidence limit of the EPI test results, and structured to be analogous to the requirements of CSA O112.9:
Median dry shear strength = 10 MPa (1450 psi) (adopted from CSA O112.9);
Vacuum-pressure re-dried median shear strength = 7.4 MPa (1070 psi);
Three-cycle boil-dry-freeze re-dried median shear strength = 4.4 MPa (640 psi);
Median percentage wood failure = 85% for all the proposed tests (adopted from CSA O112.9); and
Lower quartile percentage wood failure = 75% for all the proposed tests (adopted from CSA O112.9). The above requirements will be discussed in the CSA Task Group, which will eventually make recommendations to the CSA Standards Committee.
Adhesion and Adhesives - Composite Materials
Documents
Moins de détails

Waferboard exposed to rain (a case study)

https://library.fpinnovations.ca/fr/permalink/fpipub40045
Auteur
Szabo, T.
Date
1978
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Szabo, T.
Date
1978
Genre du document
Research report
Description physique
7 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Weathering
Waferboard properties
Série
55-57-036
E-985
Localisation
Ottawa, Ontario
Langue
English
Résumé
Waferboard - Properties
Waferboard - Testing
Rain
Documents
Moins de détails