EN 2329-1993 pdf download.Aerospace series – Textile glass fibre preimpregnates – Test method for the determination of mass per unit area.
1.1 This EN 2329 specifies a method for determining the mass per unit area of a textile glass fibre prempregnate for aerospace use.
1.2 This standard does not give any directives necessary to meet the health and safety requirements. It is the responsibility of the user of this standard to adopt appropriate health and safety precautions.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are csted at the appropriate pPaces in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to apphes.
EN 2743 Aerospace series – Reinforced plastics – Standard procedures for conditioning prior to testing 1)
3 Definitions
A textile glass fibre preimpregnate with a thermosetting or thermoplastic resin is a material in the form of a synthetic resin impregnated textile glass fibre unidirectional sheet, tape or woven fabric and used for the manufacture of moulded components.
4 Principle
Weighing of specimens of known area after conditioning in a specified atmosphere.
5 Apparatus
5.1 Balance with an accuracy of 0.1 mg
5.2 Template of standard specimen
5.3 Ancillary items such as sharp knife and tweezers
6 Atmosphere for conditioning and testing
6.1 Conditioning
6.1.1 Conditioning of material stored at ambient temperature
For material stored at ambient temperature, the amount of material required for testing shall be sampled and conditioned in the test atmosphere (see 62.1) for a minimum of 2 h. unless otherwise specified.
6.1.2 Conditioning of material stored below ambient temperature
For macerrat stored at temperatures lower than ambient temperature, the material, suitably packed in an airtight and solvent resistant bag to prevent moisture pick-up, shall be allowed to reach ambient temperature over a period of time according to the mass of the package. This time shall not be Less than 8 h and the actual lime shall be recorded in the report.
When the material has reached the ambient temperature, the amount required for testing shall be sampled and conditioned in the test atmosphere (see 6.2.1) for a minimum of 2 h, unless otherwise specified.
6.2 Testing
6.2.1 Atmosphere for testing
The tests shall be carried out at temperature and relative humidity conditions in accordance with
EN2743B.
6.2.2 Time interval between conditioning and testing
Unless otherwise specified, the test shall be carried out within 6 h. after conditioning. the specimen being kept in the test atmosphere until the test is carried out.
7 Sampling and specimens
7.1 Specimen
The specimen has a square shape. The dimension of the s,des shall be (100 ± 1 mm.
Other dimensions of the specimen may be used, subject to agreement between the purchaser and supplier, but shall have a surface area of 100 cm2 with a tolerance of ± 2 %.
7.2 Number and distribution of specimens
At least three specimens shall be used.
These shall be evenly distributed and cut from the sample diagonally across the width or length, as shown in figures 1 and 2 for woven fabrics and in 1iyur 3 for unidirectional sheet or tape.
8 Procedure
Cut the specimens from a representative sample of the material under test, using the appropriate template.
Weigh each specimen with its separating film(s to the nearest mg (m1).
Remove the separating film(s) and weigh this to the nearest mg (m2).
9 Calculation and expression of results
The mass per unit area metre for each specimen is calculated from the formula m (rn1—m2)X 100
where:
m : the mess per unit area, in g/rn2,
ml : the mass of the specimen plus separating film(s), in g.
m : the mass of the separating film(s). in g.
Calculate the arithmetic mean of the values obtained for m, to the nearest g/m2.
10 Test report
The test report shall include the following information.EN 2329-1993 pdf download.