Details
| Translated title of the contribution | Melamine resin treated as well as varnish coated and untreated solid wood during two years of natural weathering |
|---|---|
| Original language | German |
| Pages (from-to) | 331-339 |
| Number of pages | 9 |
| Journal | Holz als Roh - und Werkstoff |
| Volume | 57 |
| Issue number | 5 |
| Publication status | Published - Oct 1999 |
| Externally published | Yes |
Abstract
Samples of solid wood, impregnated with melamine resin or coated with varnish, as well as untreated Scots pine sapwood (Pinus sylvestris L.), Norway spruce (Picea abies L.), English oak heartwood (Quercus robur L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco.) were exposed to natural weathering without ground contact for two years. The melamine resin even in low concentrations provided distinctive protection against photochemical wood degradation by weathering and infestation by wood staining fungi, but did not protect against cracking and high moisture content. In the second year of natural weathering the samples exceeded 25% moisture content on 9 days (untreated Douglas fir), 21 days (untreated oak), 88 days (untreated spruce), 129 to 160 days (pine impregnated with MF resin), 166 days (untreated pine) and 236 days (pine with varnish). After two years of weathering, the samples treated with biocide-free, transparent varnish gained a moisture content of 130% within 1 hour of floating in water. Light microscopy revealed extensive bacterial colonisation in the interior of the varnished samples which is made responsible for the increased water adsorption. The varnish, which was perforated in numerous places by blue stain but nevertheless still restricted diffusion, induced long-lasting periods of high moisture content. Thus the conditions necessary for the growth of bacteria and soft rot were provided and the risk of decay increased by the damaged coating.
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Forestry
- Materials Science(all)
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In: Holz als Roh - und Werkstoff, Vol. 57, No. 5, 10.1999, p. 331-339.
Research output: Contribution to journal › Article › Transfer › peer review
}
TY - JOUR
T1 - Melaminharzimprägniertes sowie mit Wetterschutzlasur oberflächenbehandeltes und unbehandeltes Vollholz während zweijähriger Freilandbewitterung
AU - Rapp, A. O.
AU - Peek, R. D.
PY - 1999/10
Y1 - 1999/10
N2 - Samples of solid wood, impregnated with melamine resin or coated with varnish, as well as untreated Scots pine sapwood (Pinus sylvestris L.), Norway spruce (Picea abies L.), English oak heartwood (Quercus robur L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco.) were exposed to natural weathering without ground contact for two years. The melamine resin even in low concentrations provided distinctive protection against photochemical wood degradation by weathering and infestation by wood staining fungi, but did not protect against cracking and high moisture content. In the second year of natural weathering the samples exceeded 25% moisture content on 9 days (untreated Douglas fir), 21 days (untreated oak), 88 days (untreated spruce), 129 to 160 days (pine impregnated with MF resin), 166 days (untreated pine) and 236 days (pine with varnish). After two years of weathering, the samples treated with biocide-free, transparent varnish gained a moisture content of 130% within 1 hour of floating in water. Light microscopy revealed extensive bacterial colonisation in the interior of the varnished samples which is made responsible for the increased water adsorption. The varnish, which was perforated in numerous places by blue stain but nevertheless still restricted diffusion, induced long-lasting periods of high moisture content. Thus the conditions necessary for the growth of bacteria and soft rot were provided and the risk of decay increased by the damaged coating.
AB - Samples of solid wood, impregnated with melamine resin or coated with varnish, as well as untreated Scots pine sapwood (Pinus sylvestris L.), Norway spruce (Picea abies L.), English oak heartwood (Quercus robur L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco.) were exposed to natural weathering without ground contact for two years. The melamine resin even in low concentrations provided distinctive protection against photochemical wood degradation by weathering and infestation by wood staining fungi, but did not protect against cracking and high moisture content. In the second year of natural weathering the samples exceeded 25% moisture content on 9 days (untreated Douglas fir), 21 days (untreated oak), 88 days (untreated spruce), 129 to 160 days (pine impregnated with MF resin), 166 days (untreated pine) and 236 days (pine with varnish). After two years of weathering, the samples treated with biocide-free, transparent varnish gained a moisture content of 130% within 1 hour of floating in water. Light microscopy revealed extensive bacterial colonisation in the interior of the varnished samples which is made responsible for the increased water adsorption. The varnish, which was perforated in numerous places by blue stain but nevertheless still restricted diffusion, induced long-lasting periods of high moisture content. Thus the conditions necessary for the growth of bacteria and soft rot were provided and the risk of decay increased by the damaged coating.
UR - http://www.scopus.com/inward/record.url?scp=0033215855&partnerID=8YFLogxK
U2 - 10.1007/s001070050353
DO - 10.1007/s001070050353
M3 - Artikel
AN - SCOPUS:0033215855
VL - 57
SP - 331
EP - 339
JO - Holz als Roh - und Werkstoff
JF - Holz als Roh - und Werkstoff
SN - 0018-3768
IS - 5
ER -