Film faced plywood - technical characteristics. Wood-plate laminated material can rightfully be called proven and popular among builders of housing complexes. Plywood is almost everywhere used as a substitute for wooden panels in many building structures where high strength and durability are required. This is a new generation material, which is now produced under the name "film faced plywood", whose technical characteristics are competitive with plastic and polymers, and in some ways it is even better.
Although at first glance it may seem that the difference between the laminated and the usual version is only that the back and front surfaces are covered with a protective waterproof film to increase the resistance of moisture, but this is not so.
This information is presented as the only difference by many construction salons and even representatives of the manufacturing company.
But for all home craftsmen it will not be superfluous to learn that the process and conditions for making film faced plywood are slightly different from the manufacturing method conventional plywood boards, which ultimately results in a different end result.
Below are some characteristics that were defined by GOST of 2010:
For your information! Bakelite is used as an adhesive and impregnating material, i.e. phenol-resole resins.
A sheet of laminated plywood, unlike the bakelite variety, is impregnated with a hot method, and it contains less phenol. As a result, we obtain an elastic and at the same time sufficiently strong material, which has a lacquered protective polymer layer.
Film faced plywood with a waterproof effect is more ductile than bakelite board, which is better than a laminated sample in terms of water resistance characteristics, but has an increased sensitivity to abrasion and impact.
In addition to textured paper and phenol-formaldehyde resin, PVC films and melamine varnishes are used to create the coating of the laminated fork. Although the technical characteristics of melamine and PVC coatings are slightly worse than FFS, they are indispensable when creating a plywood sheet in color. If the standard samples have a phenol emission class E1 according to GOST, then a colored PVC sample emit several times less toxic substances.
According to the technical characteristics of film faced plywood and the method of using GOST, laminated board is used for exterior decoration and in the manufacture of concrete casting molds.
If the same plywood sheet is painted, then it can be used for interior work during decoration, as well as for wall cladding in a frame house and as a sublayer for leveling the floor.
It is easy to distinguish standard film faced plywood from painted plywood - it all comes down to color, since the standard version is dark brown, and colored boards are tinted in shades that are lighter than the original.
To designate plywood boards with a special coating, the abbreviation FOB is used, which stands for "facing birch plywood" ...
According to the state standard, depending on how the coating is made, there are several grades:
Used when sheathing external and internal walls of the house.
In order to ensure the invariability of these characteristics during long-term use, the ends of the sheets are pre-painted at the factory with varnishes and acrylic paints. In the wholesale trade, you can buy film faced plywood only in this form. And at the stage of pre-sale preparation, the sheets can be reshaped according to the buyer's request.
Please note, that a sheet of 1.22 * 2.
44 meters is considered an internationally recognized standard.
Although the size grid is wide, plywood is usually produced with a thickness of 0.3 cm to 3 cm.For example, for laminated boards with a thickness of 1.2 cm, the transport or wholesale size is 1.
22 * 1.25 meters, and for slabs with a thickness of 0.9 cm, the slab size is two times smaller. The fact is that the size restrictions were not set just like that - if not observed, the stiffness of the slab will be reduced. For example, a sheet of plywood with a thickness of 0.
9 cm and at a size of 1.22 * 2.5 meters will bend and deform so much that the protective film may peel off!
To obtain objective information, you can compare the technical characteristics of ordinary waterproof plywood and laminated board. Based on the studied technical characteristics, it can be safely argued that the grades of plywood with laminated coating are better than standard boards. Since the advantage is expressed only in resistance to aggressive environments and bending strength, when buying a material, it will not be superfluous to familiarize yourself with all the indicators that are given in the quality and hygienic certificate.
For example, the latter must contain a record that the material complies with sanitary standards, which will guarantee minimal risks of poisoning from phenol emissions.
This approach is associated with a large number of factors. Products from China and Russia are presented on the domestic market, while the material from the Middle Kingdom costs less, but nevertheless complies with GOST. Upon inspection, it was found that 80% of the laminated material is made from hardwood, more specifically from poplar.
If you familiarize yourself with state standards, then it is permissible to manufacture film faced plywood from some hardwood and coniferous species, but only on condition that the quality of the veneer does not affect the final technical characteristics.
According to GOST, poplar can be used, but only for the inner layer, and not the entire package.
Maple, birch and alder woods are most suitable for the production of glued plywood boards in terms of technical characteristics, and the explanation is simple - large pores and a high level of lignin. By their characteristics, conifers have even large internal channels, but they contain hemicellulose substances and resins, and for this reason, phenol-formaldehyde-based varnishes will not penetrate well into the pores of the material.
Poplar is loose and light in structure, has hemicellulose substances in excess, and they also interfere with the saturation of wood with polymers. The substance, even with a small amount of moisture, can be destroyed, and therefore poplar slabs are suitable only for disposable formwork or for finishing a room from the inside.
Sheets of film faced plywood, which are produced at factories in Russia, receive the following marking:
At the end they write a designation according to GOST, which indicates the technical characteristics of the material.
The main conditions for choosing a grade of film faced plywood are wood and its species, as well as phenol content and grade.For example, finishing subfloors requires a protective film that will reduce chemical emissions.
Often, instead of one sublayer of a thick slab for the subfloor, a base is made of 2 or 3 layers of laminated mesh plywood with gluing the surface and seam with acrylic varnish. For the subfloor, it is permissible to use lime and coniferous boards with standard characteristics. If we are talking about external walls in frame-type buildings, bodies of vehicles and technical fences, standard plywood sheets, or even the second grade, whose phenol emission class is E2, will do.
Birch laminate is considered the main material for creating reusable formwork. For an objective assessment of the capabilities of the slab, such a concept as "structure turnover" is used. The most expensive slabs are able to transfer up to 70 foundation fillings.
If you plan to install disposable formwork, it makes sense to use polystyrene foam or bakelite plates instead of laminate. In practice, prolonged exposure to the ground and abrasive action of the earth masses destroys the protective film, and the glued swollen veneer can damage the waterproofing layer or the insulation.
The sooner you remove the slab from the concrete casting, the longer the material will last.
( 1 grade, average 5 of 5 )
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