\nThermal resistance (R) and conductivity (\u03bb) are established by taking into account the aging process of the board. At least ten measurements are taken in the assessment process. The aging process is simulated using expanding gases with a lower thermal conductivity than air that remain inside the extruded polysterene for various periods of time, depending on the thickness of the tested board. A 25-year aging can be simulated using this technique. In order to establish their official values, the manufacturer of the board directly measures resistance and conductivity, in-depth as well as on its surface. The value that reflects the aging period is symbolized through the \u03bbaveragewhich stands for the average thermal conductivity of the extruded polystyrene once the aging process is complete.
\nThe SR EN 13164 standard helps to precisely define the thermal resistance (R) and conductivity (\u03bb) measuring methods. The SR EN 12667 is a special standard for measuring thin boards and SR EN 12939 deals with thick boards.
\nThe resulting values are all stated by polysterene manufacturers and can be easily found in the product\u2019s technical specification brochures, on the manufacturer\u2019s websiteand also on the product label. The manufacturer will specify in the CE label the calculated (\u03bb) value for the thermal conductivity, as specified in the SR EN 13164 method of measurement.\nThe thermal conductivity range for the XPS boards is 0.030, 0.040 and 0.045 W\/mK.
\nThe GIAS GrafitXPS board has a \u03bb value \u2265 0.030 W\/mK.<\/p>\n
2. Water absorbtion<\/strong> 3. Water vapour diffusion resistance (\u00b5) \u2013 or the so-called ability to breathe.<\/strong> \u00b5air = 1 What is Sd? According to DIN 4108 the limit for the wall\u2019s inability to breathe ( being diffusion-proof) is\nSd = 1500 m<\/em><\/p>\n 4. Resistance to corrosive substances and solvents<\/strong> 5. Fireproofing<\/strong> The GIAS GrafitXPS boards are class E products which means that the polystyrene will keep burning if exposed to fire. However, if the source of the fire is removed, the XPS board will extinguish.<\/p>\n 6. Mechanical properties<\/strong> The link between density and resistance to compression<\/p>\n <\/p>\n The link between density and tensile strength<\/p>\n <\/p>\n <\/p>\n The testing method is regulated by SR EN 1606 that states that the maximum accepted elongation is 2%.<\/p>\n 7. Dimensional stability<\/strong> One of the most important elements providing us with the desired comfort is thermal insulation. During the warm season, we want our home to be cool, while in the cold season, we want it to be hot, with thermal energy losses as low as possible.<\/p>","protected":false},"author":8,"featured_media":4131,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[34],"tags":[36,35],"class_list":["post-4116","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-biblioteca-electronica-blog-gias-xps-polistiren-extrudat","tag-polistiren-extrudat","tag-xps-vs-eps","post_format-post-format-gallery"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/posts\/4116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/comments?post=4116"}],"version-history":[{"count":0,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/posts\/4116\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/media\/4131"}],"wp:attachment":[{"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/media?parent=4116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/categories?post=4116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/testareweb.ro\/en\/wp-json\/wp\/v2\/tags?post=4116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nWater damages thermal insulation by permeating its structure. This leads both to the direct damage to the material as well as a loss of insulating qualities, as water conducts heat 25 times better than air. The spongy extruded polystyrene material on the other hand, due to its closed-cell structure, withstands water and humidity, being thus a reliable solution for the safe, long-term insulation of a building. The thermal insulation is not affected by water, the boards providing appropriate insulation during the lifetime of the building.
\nDue to this feature, the XPS boards provide an important advantage when their uses require a certain level of detail. For example, on a terraced roof, in the inverted terrace system, the XPS boards, due totheir waterproofing qualities, provide a long lifetime solution. When enveloping a building\u2019s exterior wall the XPS boards are waterproofed for any conditions and are designed to withstand continuous inclement weather and freeze-defreeze cycles, maintaining their compressive strength for the entire lifetime of the building and their insulation capability throughout their lifetime.<\/p>\n
\nThe \u00b5 parameter defines the resistance to the diffusion of the water vapour as compared to the resistance to air and establishes the quantity of vapours that passes through a certain surface area in standardized time, temperature and humidity conditions and for a particular standardized width for the tested materials.
\nDiffusion occurring on the walls of a building, commonly called the ability of the wall to breathe, is defined by the \u00b5 parameter for every building material. Each has its own coefficient value for water diffusion.
\nExtruded polystyrene materials, owing to their increased resistance to water vapour diffusion, have a parameter value that is optimally suited for their different uses.
\nSee below for a comparison of \u00b5 values:<\/p>\n
\n\u00b5mineral felt = 1
\n\u00b5EPS = 50-70,
\n\u00b5XPS = 50-250
\n\u00b5bitumen membrane = 20,000-50,000
\n\u00b5Aluminium foil = 1,000,000<\/p>\n
\nSd = \u00b5 x d
\nSd is used in practice and indicates the thickness of a static layer of air that has the same water vapour resistance (\u00b5)as the building material thickness (d). It is directly proportional with the diffusion resistance and the thickness of the building material t, measured in meters.
\nSd= the equivalent thickness of a layer of air.
\nSee below for a comparison of lengths that must be travelled by water vapours for various building materials:<\/p>\n\n
\nThe operation of a building must take into account the resistance to corrosion by various chemical substances as the thermal insulation comes in contact with: adhesives, paints, solvents, thinners, bitumen based products, concrete, etc. XPS boards can withstand corrosion from building materials like lime, cement, gypsum, bitumen, physiological serum, diluted acid, etc. XPS boards can not, however, withstand corrosion from flammable bitumen-based substances, varnish or solvent-based thinners.<\/p>\n
\nLike any other organic material, XPS boards can catch fire. Unless fire retardant substances are used, XPS, as a self-standing product, tests as an E class product under the European fire regulations.\nDue to the XPS boards never being used on their own, that is, not directly exposed to a flame or covered in various other products, such as plasters, it makes sense that the testing is done with the covering material on.
\nThe reaction to fire for a certain material is determined by its flammability (whether or not it can combust), the degree to which the flames persist and whether or not incandescent particles detach from it.\nFire resistance is the time value for which the material can hold its structure during a fire. It is influenced by the below parameters:
\n- the percentage of flame retardant additives used
\n- the flammability of the expanding gas
\n- the tested sample (the width)
\n- the material\u2019s density<\/p>\n
\nOne of the superior qualities of the XPS extruded polystyrene boards is its high compressive resistence for both short-term and long-term loads. A thermal insulator with high compressive strength will very slightly decrease its width when subjected to a load, maintaining intact calculations pertaining to the thermal insulation, the material\u2019s insulation features and values being preserved.\nThe material\u2019s thermal resistance is directly proportional to its width: R = d \/ \u03bb.
\nExtruded polystyrene is among materials with high compressive strength.As a safety measure, loads that correspond to a 10% deformation of the material\u2019s basic shape can be taken into account.
\nThere is a direct proportionality between XPS\u2019 density and one of its main features: its resistance to compression\/elongation. As the density increases so will the resistance. The GIAS GrafitXPS graphite boards have a minimum density of 32 kg\/m3, 20% higher than similar products.<\/p>\n![\"Tabel](\"https:\/\/testareweb.ro\/wp-content\/uploads\/2021\/04\/COMPARATIE-XPS-1-640x303.png\")
<\/p>\n![\"COMPARATIE](\"https:\/\/testareweb.ro\/wp-content\/uploads\/2021\/04\/COMPARATIE-XPS-2-640x426.png\")
<\/p>\n
\nThermal insulators, through their nature, will have to undergo temperature fluctuations. This will give rise to major temperature differences on their opposing sides while also being affected by the day-night cycles. Dimensional stability is the most important property that influences the behaviour of a thermal insulator during daily operation.The spongy XPS extruded polystyrene material is assumed to have a three dimensional cell structure which is balanced, airtight and consistent.<\/p>","protected":false},"excerpt":{"rendered":"