Liquid water permeability of exterior wood coatings-testing according to a proposed european standard method

2001 ◽  
Vol 73 (3) ◽  
pp. 53-59 ◽  
Author(s):  
Jan Ekstedt ◽  
Gunilla Östberg
Keyword(s):  
Standard Method ◽  
Water Permeability ◽  
Liquid Water ◽  
European Standard ◽  
Wood Coatings ◽  
Exterior Wood

scholarly journals WATER PERMEABILITY OF EXTERIOR WOOD COATINGS: WATERBORNE ACRYLATE DISPERSIONS FOR WINDOWS

2018 ◽  
Vol 13 (3) ◽  
pp. 1-16 ◽  
Author(s):  
Štěpán Hýsek ◽  
Hakan Fidan ◽  
Miloš Pánek ◽  
Martin Böhm ◽  
Kamil Trgala
Keyword(s):  
Water Vapor ◽  
Film Thickness ◽  
Water Absorption ◽  
Liquid Water ◽  
Coating Film ◽  
Water Vapor Absorption ◽  
Protective Function ◽  
Wood Coatings ◽  
Vapor Absorption ◽  
Exterior Wood

Permeability of coatings for water and water vapor is an important factor in their wood protective function. In this study, the permeability of coatings in terms of liquid water and water vapor absorption and desorption was measured based on different parts of the standard EN 927. This study evaluated the permeability of commercial coating systems and ascertained effects of coating layering on the coating permeability. For this measurement, six different waterborne acrylate dispersions were used as paint on spruce test samples. The results clearly revealed that liquid water and water vapor uptake were affected by coating film thickness, number of coats, and coating composition (producer). It was ascertained that the type of coating pigmentation affected water absorption of coatings and that with a constant coating film thickness, the number of coats affected water vapor absorption and desorption, but not water absorption. Furthermore, it was observed that the number of coats affected the correlation between the coating film thickness and water vapor absorption and desorption. The values for water vapor absorption were much higher than for liquid water absorption and, unlike the water vapor absorption rate, the water vapor desorption rate was approximately 50% lower.

scholarly journals Physical, Optical, and Visual Performance of Coated Cross-Laminated Timber during Natural and Artificial Weathering

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 252
Author(s):  
Gabrielly dos Santos Bobadilha ◽  
C. Elizabeth Stokes ◽  
Katie M. Ohno ◽  
Grant Kirker ◽  
Dercilio Junior Verly Lopes ◽  
...  
Keyword(s):  
Color Change ◽  
The United States ◽  
Market Demand ◽  
Field Exposure ◽  
Visual Appearance ◽  
Artificial Weathering ◽  
Cross Laminated Timber ◽  
Wood Coatings ◽  
Coating Type ◽  
Exterior Wood

Cross-laminated timber (CLT) market demand is on the rise in the United States. Adequate protective measures have not been extensively studied. The objective of this study was to investigate the weathering performance of exterior wood coatings. We evaluated coated CLT sample surfaces based on visual appearance, color change (CIE*L*a*b), gloss changes, and water intrusion. From the five exterior wood coatings evaluated, only two showed adequate performance after twelve months field exposure. Based on visual ratings following the ASTM procedures, coating failure occurs more quickly in Mississippi than in Wisconsin, due to its greater decay zone. Both location and coating type impacted the aging of the samples. Artificial weathering results were consistent with natural weathering indicating the two adequate coatings were the most resistant to failure, color, and gloss change. For future studies, new coatings designed for the protection of end-grain in CLT panels should be a target of research and development.

Water-Resistance of Nanofiber Textiles

2017 ◽  
Vol 731 ◽  
pp. 55-59
Author(s):  
Martin Černohorský ◽  
Michal Havrlík
Keyword(s):  
Contact Angle ◽  
Water Vapor ◽  
Liquid Water ◽  
Water Resistance ◽  
Diffusion Resistance ◽  
European Standard ◽  
Material Basis ◽  
Nanofiber Textile ◽  
Resistance To Penetration

This work deals with the determination of basic waterproofing properties of nanofiber textiles with basis weights of up to 30 g/m2. Samples used in this experiment were made from nanofiber textiles based on two polymers – PVDF and PUR. Each polymer was prepared in three basis weights. All samples were not treated prior to testing. One of the key properties was the contact angle of water and the resistance to penetration of liquid water. Water-resistance of nanofiber textiles was tested according to the harmonized European standard EN 13859-1., Underlays for discontinuous roofing in pitched roof constructions are tested according to this standard. In the position of underlays there has to be some layer with low diffusion resistance of water vapor and relatively high waterproofing. We suppose such properties of nanofiber textiles. Testing of the two groups of material basis shows correlation between the contact angle and water-resistance of the nanofiber textile.

Modelling film formation and degradation of semi-transparent exterior wood coatings

2007 ◽  
Vol 58 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Jan Van den Bulcke ◽  
Joris Van Acker ◽  
Hans Saveyn ◽  
Marc Stevens
Keyword(s):  
Film Formation ◽  
Wood Coatings ◽  
Exterior Wood

scholarly journals Maintenance procedures and definition of limit states for exterior wood coatings

2010 ◽  
Vol 69 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Gerhard Grüll ◽  
Michael Truskaller ◽  
Laurence Podgorski ◽  
Susanne Bollmus ◽  
Florian Tscherne
Keyword(s):  
Limit States ◽  
Wood Coatings ◽  
Definition Of ◽  
Exterior Wood

THE INFLUENCE OF THE PREHEATING OF WOOD IN WATER ON THE RATE OF DELIGNIFICATION BY SULPHITE LIQUOR

1935 ◽  
Vol 13b (3) ◽  
pp. 149-155 ◽  
Author(s):  
A. J. Corey ◽  
O. Maass
Keyword(s):  
Standard Method ◽  
Liquid Water ◽  
Wood Chips ◽  
Tentative Explanation

The rate of delignification of wood chips has been measured and found to conform to the monomolecular relation, provided that the standard method of penetration developed in this laboratory is used (3). Pretreatment of the wood chips by heating in liquid water at 130 °C. decreases the rate of delignification by subsequent cooking in sulphite liquor, and the rate no longer conforms to the monomolecular relation. Preheating of the wood to 130 °C. in the absence of water does not influence the rate of subsequent delignification. The results indicate the advantage of reducing the time of cooking, and a tentative explanation has been offered regarding the mechanism involved.

scholarly journals Infrared spectroscopic measurement of water permeability in polymer films exposed to liquid water

2006 ◽  
Vol 25 (5) ◽  
pp. 642-649 ◽  
Author(s):  
William F. Bauer ◽  
Mark L. Stone ◽  
Christopher J. Orme ◽  
Mason K. Harrup ◽  
Thomas A. Luther
Keyword(s):  
Polymer Films ◽  
Water Permeability ◽  
Liquid Water ◽  
Spectroscopic Measurement ◽  
Infrared Spectroscopic
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