BS EN 15651-2 2017 pdf free download.Sealants for non-structural use in joints in buildings and pedestrian walkways Part 2: Sealants for glazing
4 Requirements
4.1 Identification requirements and test methods
4.1.1 Short description of the sealant The short description of the non-structural sealant for glazing elements shall include: brand name, type (general chemical family), opaque or translucent, waterborne or solvent based or solvent free, reactive or non-reactive, and one or multi-component (e.g. neutral cure, reactive silicone and one component, etc.). The primer shall be stated for the substrate concerned if relevant (name, chemical type, etc.).
4.1.2 Thermogravimetric test The test shall be carried out in accordance with EN ISO 11358 on the uncured or wet sealant, between 35 °C to 900 °C, temperature slope 10 °C/min, non-oxidative condition (e.g. nitrogen). A single sample shall be used for this test. A single specimen may be tested and there shall be no significant difference between the reference curve and derivative (profile). In the case of multi-component sealant, each component shall be evaluated (if relevant).
4.1.3 Density
4.1.3.1 Principal A pyknometer is filled with the product under test. The density is calculated from the mass of the product in the pyknometer and the known volume of the pyknometer.
4.1.3.2 Method A test temperature of (23,0 ± 0,5) °C shall be used and the test sample and pyknometer shall be conditioned to this temperature, and it shall be ensured that the temperature variation does not exceed 0,5 °C during testing. The determination of the density shall be in accordance with EN ISO 2811-1:2016 and should be carried out using a suitable 50 cm 3 calibrated pyknometer as described in EN ISO 2811-1:2016, 6.1.1. An alternative is the 50 cm 3 Hubbard pyknometer as described in ISO 3507. Measurements should be carried out on the uncured or wet sealant and in the case of a multi- component sealant, each component shall be evaluated. At least three samples shall be tested.
The specific pyknometer used and the mean value, recorded to two decimal places, shall be declared. The tolerance of the declared values shall be within ± 5 %.
4.1.4 Hardness (indentation) test (Shore Hardness) The determination of the indentation hardness shall be in accordance with EN ISO 868.
The test shall be performed on the cured or dried sealant. The exact conditions of test shall be defined by the manufacturer, i.e. thickness, cure/drying times and temperature and relative humidity, specific hore type (A, D…), test time, temperature, etc.
At least three samples shall be tested and the five measurements taken per sample. The mean value and tolerances of all measurements, recorded to the nearest unit, shall be declared.
4.2 Conditioning, test procedure and substrates
When determining the classification of a glazing sealant according to the requirements of this standard, the same conditioning procedure shall be used in all relevant test methods (use only Method A or Method B). For each test method, three test specimens for each substrate shall be tested. The same batch of sealant (and primer, if used) shall be used in all tests. The same substrates (material and surface finish) shall be used in all tests. Tests shall be performed on glass according to ISO 13640.
The specific test conditions for each test method are given in Table 1.
Substrates to be used in all mechanical tests concerned shall be glass according to ISO 13640. Additional substrates to be considered mortar are M1 or M2 and/or anodised aluminium.
4.3 Performance requirements
4.3.1 General
Classes for elastic sealants for glazing in building construction are referred to as type G. A summary of the characteristics and classes are given in Table 2.
4.3.2 Sealants for glazing elements in cold climates
4.3.2.1 General This test has been developed to demonstrate that glazing sealants perform well at lower temperatures than those currently tested in EN ISO 11600 (i.e. common winter temperatures in Northern Europe).
The specification intention is to ensure that the sealant continues to perform at – 30 °C, which is a common winter temperature in cold climate areas. In addition to the requirements given in Table 2, non-structural sealants for glazing elements required to maintain performance in cold climate (- 30 °C) shall fulfil also requirements as given in Table 3. The classification of the sealant given in Table 2 shall be determined prior to this optional additional test and the corresponding test amplitude shall be applied to this additional test.
The designation CC (cold climate) shall be declared for any sealant meeting the requirements of Table 2 and 3. For example, Type G Class 25LM CC. Anodised aluminium or/and glass and/or mortar M1 or M2 substrates, according to ISO 13640, shall be used.
4.3.2.2 Tensile properties – Secant modulus to EN ISO 8339:— test procedure at (- 30 ± 2) °C The test specimens shall be stored at (- 30 ± 2) °C for at least 4 h before the start of the test. The spacers for the preparation of the test specimens shall be removed and the test specimen placed in the tensile test machine and extended at (- 30 ± 2) °C at a rate of (5,5 ± 0,7) mm/min until rupture occurs. The force/extension diagram shall be recorded.BS EN 15651-2 pdf download.