EN 17333-4-2020 pdf download.Characterisation of one component foam-Part 4 Mechanical strength.
4.2.5 Expression of results
In total there are six measurements. Three moistened and three dry joints.
Take the mean value of the three measurements; report whether the test piece was moistened or not. The tensile force, usually obtained in Newton (N), is divided by the foam area in square centimetres to express the tensile strength in kilopascals.
Report the maximum mean tensile strength in kilopascals and elongation at maximum mean tensile strength in per cent.
4.2.6 Test report
The test report shall include the following information:
a) reference to this document;
b) the name and address of the testing laboratory;
c) the number and date of the test report;
d) the name and signature of the person responsible or signatory of the report;
e) product identification:
1) product name, manufacturer or supplier,
2) batch number or identification code,
3) origin of the sample(s),
4) way of dispensing. e.g. dispensing gun and type or adapter tube,
5) packaging: volume.
6) expiry date and/or production date;
f) test procedure for test performed according to 4.2:
1) date of test,
2) performer.
4.3.1 Principle
The foam is dispensed in the gap between two boards. When foam is fully cured, the boards are moved in opposite but parallel directions to each other (sheared) while the applied force is measured.
4.3.2 Equipment
For each test piece (in total 3 test pieces are required):
4.3.2.1 Two P3 or PS particle boards (compliant with EN 312) with dimensions of
140 mm x 100 mm x 10 mm (length x width x thickness) with sides sealed with an impervious waterproof coating or sealant material (e.g. epoxide or polyester based product or silicone sealant).
4.3.2.2 2 spacers, not water absorbing not adherent, (e.g. polyethylene (PE), polytetrafluoroethylene (PTFE), on which polyurethane (PU) does not adhere), thickness 20 mm.
4.3.2.3 2 screw clamps.
Set of test piece grips.
4.3.2.4 Sharp and clean knife blade.
4.3.2.5 Conditioning chamber capable of being controlled at (23 ± 2) C and (50 ± 5) ‘Yo RH.
4.3.2.6 Tensile testing machine.
4.3.3 Sampling
4.3.3.1 Conditioning
Bring the test container and the particle boards to the test temperature (23 ± 2) °C and (50 ± 5) % RH for at least 24 h.
4.3.3.2 Test pieces
a) Prepare the test piece with two particle boards plates, separated by a spacer and fix them with two clamps. The remaining space to be filled with foam shall be approximately 100 mm x 100 mm,
b) Place the fixed boards vertically.
c) Moisture curing foams and water drying foams can be tested dry or moistened. When moistened, the boards are immersed in water for 20 s, taken out and stored with the particle boards vertical and the spacers on the side for two minutes, until excess water drips off. For the test of self-curing foams do not moisten.
4.3.5 ExpressIon of results
It is necessary to complete at least three measurements to obtain a statistically relevant mean value. Report the mean of the measurements and kind of break (cohesion or adhesion).
The shear force, usually obtained in Newton (N), is divided by the foam area in square centimetres to express the shear strength in kilopascals.
Report whether the test piece was moistened or not.
4.3.6 Test report
The test report shall include the following information:
a) reference to this document;
b) the name and address of the testing laboratory;
c) the number and date of the test report;
d) the name and signature of the person responsible or signatory of the report;
e) product identification:
1) product name, manufacturer or supplier,
2) batch number or identification code,
3) origin of the sample(s),
4) way of dispensing. e.g. dispensing gun and type or adapter tube,
5) packaging: volume,
6) expiry date and/or production date;
test procedure for test performed according to 4.3:
1) date of test,
2) performer,
3) any deviation from procedure in 4.3;EN 17333-4-2020 pdf download.