Thermal insulation products for building applications
BS EN 13497:2018 pdf free.Thermal insulation products for building applications一Determination of the resistance to impact of external thermal insulation composite systems (ETICS).
For the test a steel ball is dropped from a specified height onto the surface of the test specimen (see Table 1). A second impact (rebound) by the ball shall be avoided.
5.2 Steel ball requirements
Balls made of cutlery grade steel, AISI/SE Type 440 C and grade G100 according to Iso 3290-1 with the weights and nominal diameters given in Table 1.
5.3 Crack measuring gauge
For measurement of the width of any cracks formed as a result of the impact of the steel ball onto the surface of the test specimen. The gauge shall be capable measuring from 0.1 mm and be graduated in steps of 0,05 mm.
5.4 Specimen support
The support itself shall be flat, not bend, deform or absorb impact energy during the test, e.g. concrete support, in order not to influence the test result. E The test specimen shall be firmly held to prevent movement during the test.
NOTE 1 Larger specimen tends to show less movement than smaller specimen.
NOTE 2 The specimen might be fixed, clamped or glued to the support so that contact between them is maintained during the test.
5.5 Optional tube to control descent of steel ball
A vertical tube manufactured from a metal or rigid plastic can be used for this purpose with an inner diameter at least 2 mm larger than the steel ball diameter. The walls of the tube should preferably include regular perforated holes to prevent air within the tube becoming compressed due to the velocity of the ball during its descent and thereby acting as a “resistance cushion” to the impact of the ball with the specimen surface.
6.1 Preparation of a test specimen
The test specimen shall have the size/dimension to allow minimum 5 impacts taking into account the minimum distances according to 7.2. It consists of the thermal insulation product with the rendering system. It shall be prepared according to the system holders instructions.
6.2 Sealing and conditioning of test specimens
Sealing and conditioning of test specimen shall be according to procedure 1 or procedure 2 as follows:
The reverse side and the edges of the test specimen shall be sealed, if exposure to water occurs. Condition the test specimens after preparation as follows:
— (23 ± 2) °C and (SO ± 5) % r. H. for at least 28 days;
— Conditioning according to EN 16383 test cycles, either
— heating and wetting (hw), or
— heating and wetting plus heating and cooling (hwc), or
— heating and wetting plus heating and cooling plus wetting, freezing and thawing (hwcftj).
一Drying for at least 7 days at (23 ±2) °Cand (50+5) %r. H.
The edges of the test specimens shall be sealed. Condition the test specimens after preparation as follows:
一(23 ±2)C and(50土5)%r.H.foratleast28days;
Immersion in tap water for at least 7 days at (20 ±5) °C. The depth of submersion over the entire surface shall be at least 2 mm that is, the distance between levels 6 and 7 in Figure 1;
The test specimen shall be placed on a support according to 5.4.
The steel ball is dropped from the specified height onto the surface of the test specimen, as determined in Table 1, see Figure 2. For each energy level chosen, five separate impacts are performed at different positions of the test specimen. The minimum distance between any impact position and the specimen edges shall be at least 100 mm. The minimum distance between any impact position and the insulation board edges shall be at least 100 mm, i.e. no impact on a joint between insulation boards if more than one board is used to prepare the test specimen. The centre to centre distance between any two impacts shall be at least 100 mm.
In case of possible rebound, the steel ball shall be caught or diverted away to avoid a second impact.
If a perforated tube is used to control descent of the steel ball, it can be placed directly onto the test specimen surface. Alternatively, an unperforated tube can be used but this should be lifted above the specimen surface to allow the compressed air to be dissipated immediately before impact occurs. The verticality of the tube shall be checked before each individual test. The tube may be used for diverting the steel ball before a second impact.
Test results will be visibly observed and described. The observations are made from the external surface and from the rear face of the rendering system. The insulation product shall be removed carefully.
Observations shall be taken at each impact zone. If one or more of the following defects are observed, no further evaluation is necessary:
— delamination between the finishing layer and the base coat;
— delamination between the base coat and the insulation product;
— delamination within the base coat;
— visibility of the reinforcement;
— perforation of the finishing layer and/or base coat.
— cracks in the impacted surface wider than 0.2 mm.
If none of these defects are observed, state it in the test report and examine the cracks on each impact zone. The impact zone shall be examined from several angles with a bright white light to measure the maximum width of the widest crack:
— cracks in the external surface of the render system. The maximum width of the widest crack is measured with the gauge specified in 5.3; record in increments of 0,05 mm or state no cracks observed
— cracks in the rear face of the render system. The maximum width of the widest crack is measured with the gauge specified in 5.3; record in increments of 0,05 mm or state no cracks observed;
NOTE Separation of the layers can be done mechanically with a suitable knife/hot wire. Alternatively, some thermal insulation products can be dissolved using solvents. If this process is used, it is advised to follow the safety procedures associated with the use and disposal of the particular solvent.
— spalling of grains at the point of impact;
— Report the maximum depth for each impact zone to the nearest mm or state no deformation observed.
9 Accuracy of measurement
NOTE It has not been possible to include a statement on the accuracy of measurement in this edition of the standard, but it is intended to include such a statement when the standard is next revised.BS EN 13497 pdf free download.Thermal insulation products for building applications