Thermal DeformationBirch plywood has excellent dimensional stability under heat, far superior to that of metals and plastics. In practice, the thermal deformation of birch plywood is so small, that it can generally be disregarded. Useable temperature range for Birch PlywoodsStandard Birch plywood and most coated birch plywood products are suitable for use at temperatures of 100°C and many up to 120°C. The supplier should be consulted for applications at high temperatures, especially if the birch plywood is load carrying. Birch plywood endures cold even better than heat and can be used at sustained temperatures as low as-200°C. Fire PerformanceAlthough Birch plywood burns it can have better fire resistance than many materials which do not burn. Birch plywood has an optimal dimensional stability under heat and a low rate of combustion, better than solid wood. The temperature at which Birch plywood will ignite when exposed to a naked flame is about 270°C whilst a temperature of over 400°C is needed to cause spontaneous combustion. When exposed to a fully developed fire, Birch plywood chars at a slow and predictable linear rate (about 0.6 mm per minute), which enables it to be used in certain fire resisting constructions. This property can be improved by impregnation or coating the Birch plywood with proprietary formulations or by facing with non-combustible foils.
The sound insulation of Birch plywood can be improved by using sandwich construction and by avoiding gaps between elements. Emission of formaldehydeFormaldehyde emission from phenol formaldehyde resin adhesive bonded Birch plywood is very low and measured values are below even the tightest national requirements. When determined according to EN 717-2, the formaldehyde emission from unsurfaced exterior birch plywood is 0.4 mg HCHO/(m2·h), significantly lower than the requirements of class E1 (the best class). Also Sveza, Birch plywood-exterior meets requirements of the formaldehyde emission limits of EN 1084, release class A (the best class) as well as enjoys the exemptions from California ARB regulations for P2. Chemical ResistanceBirch plywood has good resistance to many dilute acids and acid salt solutions. Alkalis tend to cause softening. Direct contact with oxidising agents such as chlorine, hypochlorites and nitrates should be avoided. Alcohols and some other organic liquids have an effect similar to water, producing swelling and slight loss of strength. Apart from discoloration, petroleum oils have no effect. Sound InsulationSound is transmitted through air and through structures. Airborne sound insulation is dependent on the density of the insulating material. Birch plywood is a good insulating material in relation to its weight. For these reasons plywood is a good material for acoustic improvement solutions. The average measured sound reduction index (for the frequency range 100-3200 Hz) for single panels of Finnish plywood is given in table. PreservativesPlywood is made from natural Birch wood Veneers grown and harvested in Russia and is free from any toxic chemicals except resin. As is common knowledge, all wood products are susceptible to insects or termites and/or borers present in different climatic zones in the soil or buildings. It is recommended that the users are applying the coat of suitable chemicals or insecticides on all exposed surfaces of wood in addition to treatment of masonry foundations of the building where the Wood products are required to be use. Fipronil emulsified concentrate at about 3% is one such chemical and effective deterrent against insects and pests or termites in tropical climate zones. However, the application should be in accordance with manufacturers guidelines for effective results. Users own discretion in selection of appropriate chemical and its doses or frequency of such treatment is advised for satisfactory results in the light of experience gained over the period of time. Availability options:
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Related Documents
Related knowledge documents :
US Lacey Act - Declaration Form
FAQ- The US Lacey Act
EPA Wood Composite FAQ
US EPA formaldehyde-emission-standard
EPA-EPA-950-F-17-001
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