General material specifications
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Lappset Materials 2016.pdf
Pine grows slowly (130–140 days/year) in the northern Boreal region, making it fine-grained and tough. Pine is a living material, swelling when it gets wet and shrinking when it dries. Pine can bend and crack. However, whatever happens, its toughness remains. Resin and knots are a natural part of the wood.
Typical to northern pine, the majority (70%) of timber is heartwood. Heartwood is extremely tough and the structure of wooden parts is usually designed so that the tough heartwood is on the surface where the timber is most vulnerable to the elements. The surface of the wood is susceptible to rotting, but modern wood protection technology and safe wood preservatives help make the surface durable too. Lappset’s wood preservatives do not contain arsenic or chromium. Timber treated with these wood preservatives can be recycled as impregnated wood. We use water-based paints to improve surface properties and to protect the wood against the sun’s ultraviolet irradiation and against aureobasidium. Some painted surfaces are further protected with a layer of varnish. Timber treated solely with these preservatives can be disposed of as wood waste.
Extra strong, long, sturdy, and curved components are manufactured from laminated wood composed of sheets of timber pressed together and bonded with weatherproof glue. Widely variable weather conditions may cause small splits to appear on the laminated wood, but these do not reduce its durability. Laminated timber does not twist or distort and although changes in humidity cause movement in wood, this occurs more often in solid wood than in laminated timber. Depending on the treatment, laminated wood can be recycled either as impregnated wood or wood waste.
The posts and pillars usually stand on metal feet. Bolts are glued on to wooden pillars to allow a flange to be attached for mounting the feet. The vertical tensile breaking strength of the joint between the post and the steel foot is 60,000 N. The post’s transverse strength is 2,200 Nm (220 kgm).
Depending on the circumstances, we use 6.5–21 mm plywood or high pressure laminate. The plywood is made of thin, alternating birch and/or pine plies bonded with weatherproof glue. Panels are coated with a hot-pressed, impregnated weatherproof surface agent, and most are further coated with weatherproof and wear-resistant paint. Floor panels also feature a roughened, non-slip surface. Depending on treatment, the plywood can be recycled either as impregnated wood or as wood waste.The HLP elements are between 6 and 20 mm thick, and survive knocks, scratching and varying weather conditions. UV irradiation does not weaken the strength of high pressure laminate, but bright colours may fade over time. Laminates can be used in thermal energy production.
The metal parts are made of stainless steel, anodised or painted aluminium or hot-dip galvanised steel, and the steel components are either sandblasted and treated with zinc epoxy and powdered paint or given an electrodeposited zinc coating and then a coat of powdered paint. The metal components have excellent weather-resistant properties and a finished look, they are also recyclable.
The plastic parts are made of polypropylene, polyamide, polycarbonate or polyethylene. The material is always chosen according to the requirements of each element. Fibre is added to the aforementioned materials in components that are subject to heavy stresses. The plastic materials are recyclable.
The ropes in our net products are polyamide-coated steel cable of 16 or 18 mm diameter. The tensile strength of the ropes is minimum 2,200 kg. The materials and the braiding on the topmost layers of the ropes have been chosen on the basis of their superior wear resistance and UV-protective properties. Rope strength is unaffected by surface wear. The ropes are recyclable.
For part of its product range Lappset uses components made of bonded rubber shred, consisting of recycled rubber granules glued together with weather-resistant polyurethane adhesive. Some of these components use a combination of bonded rubber shred and natural rubber (EPDM). All components containing rubber shred are recyclable.
All our swing chains are made of 6 mm diameter stainless steel, guaranteeing long-lasting protection against corrosion, even in demanding conditions. The chains are recyclable.
LappCoat is a coating method for metal components, developed by Lappset. We have designed the method with particular attention to the requirements of playground equipment. The LappCoat coating was innovated through research and development which helped us define the stages of the production process, the chemicals used in the process, and the coating thicknesses. LappCoat provides metal components with unbeatable qualities, such as a 10-year guarantee.
The LappCoat coating process has four stages. In the final stages, the metal components are undercoated with a zinc epoxy primer which protects them from corrosion and automatically repairs small scratches on the surface. The LappCoat surface is finished with polyester powder coating, which leaves the surface shiny, extremely durable and pleasant to touch. The LappCoat method guarantees that the metal components have long-lasting, bright and fresh colours.
The LappCoat coating process is made unique by our rigorous methods and quality control. Even the smallest details of all stages of the process have been audited. In order to guarantee the outcome, we have also audited the processes of all subcontractors importing the materials needed in the LappCoat coating.