BS EN 2757-2011 pdf download.Aerospace series Structural adhesives system Test method Determination of the drying and ignition residues of primers.
2 Normative references
The following referenced documents are indispensable for the application of this document, For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2642, Aerospace series — Structural adhesive systems — Adhesive film — Technical specification1)
3 Definitions and abbreviations
See EN 2642.
4 Health and safety
This standard does not necessarily include all health and safety requirements, if any, associated with its use.
Persons using this standard shall be familiar with normal laboratoryItest house practices.
It is the responsibility of the user to establish satisfactory health and safety practices and to ensure conformity
with any European. National and/or local laws or regulations.
5 Principle!Technique
5.1 Method A
The drying residue (or solid content) is determined by weighing before and after a drying process, and is expressed as a percentage of initial weight.
The drying residue contains the proportions of all non volatile components of the primer, i.e. polymers and, in the case of corrosion inhibiting primers, inhibitors.
5.2 Method B
The residue after ignition of corrosion inhibiting primers (corrosion inhibitor content) is determined by weighing the drying residue before and after a glowing process, and Is expressed as a percentage of the drying residue.
6.2 Materials/reagents
Drying agent: silica gel. phosphorus pentoxyde,
7 Test samples
Primers which are stored at temperature below ambient shall be brought to this temperature in their onginal tightly closed containers.
Shake or mix the primer in its original container before taking a sample.
Three samples, approx. 5 grams to 10 grams are required for each determination of drying residue and residue after ignition.
8 Testing procedure
Heat up the crucible to the constant mass point at a temperature 10 °C higher than the drying temperature in 8.1.3 for drying residue determination, or than the ignition temperature in 8.2.1 if the residue after ignition is to be determined.
Then cool the crucible to ambient temperature In the dessicator fitted with the suitable drying agent.
8.1 Drying residue
NOTE Use appropriate air extraction.
8.1.1 Weigh the crucible to the nearest milligram (m1).
8.1.2 Place the sample of primer in the crucible and weigh simultaneously to the nearest milligram (rn2).
8.1.3 Dry the sample of primer to the constant mass point at the processing temperature defined in the relevant material standard. Care shall be taken during heat up to avoid boiling of the sample.
8.1.4 Cool the crucible and sample to ambient temperature in the dessicator, and weigh to the nearest milligram (m3).
8.2 Residue after ignition
Use the residue obtained in 8.1 for the determination of residue after ignition.
11 Test report
It shall include:
— reference to the test method standard;
— identification and traceability of the primer, in accordance with the technical specification;
— identification and traceability of test samples:
— expression of results (individual and mean values):
– traceability of individual performing the test work;
-— any incident which may have affected the results;
— any deviation from the test method standard;
— date of test.BS EN 2757-2011 pdf download.