ISO 13996:1999 download free.Protective clothing – Mechanical properties-Determination of resistance to puncture.
1 Scope
ISO 13996 specifies a test method for measuring the puncture resistance of protective clothing or
materials used for these products.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of ISO 13996. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on ISO 13996 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and lEG maintain registers of currently valid International Standards.
ISO 2231, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing.
ISO 7500-1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tensile/compression
testing machines.
3 Term and definition
For the purposes of ISO 13996, the following term and definition apply.
puncture resistance
maximum force required to push a spike with a specified speed through the test specimens
NOTE It is expressed in newtons.
4 Test specimens
Take four representative test specimens from the sample, each of 50 mm minimum diameter, so that the specimens fit between the bolt holes of the clamps.
The test spike shall be checked by an optical enlargement after every 500 tests or at least once a year. When testing materials, which wear out the test spike, the optical checks shouki be done more frequently. If this check shows that the test spike dimensions do not comply with the dimensions of Figure 1, the test spike shall be discarded.
Control of the dimensions of the test spike is important. It is recommended that every test laboratory maintain an internal reference material to carry out regular checks on the results of the testing.
5.1.3 Clamping rings, to prevent slippage during the test.
They shall consist of two steel plates, at least 10 mm thick, each having a (20 ± 0,5) mm diameter hole in the centre and four cIampng bolts, as shown in Figure 2.
NOTE Gripping aids can be used it necessary to prevent slippage or to reduce damage to the specimen.
5.2 CondItioning
The specimens shall be conditioned arid the test shall be conducted in the standard atmosphere as described in ISO 2231, i.e. at a relative humidity of (65 ± 5) % and a temperature of (20 ± 2) °C. Conditioning at a specified relative humidity may be omitted if it can be shown that the results for the type of material under test were not affected.
5.3 Procedure
Secure the specimen between the clamping rings (5.1.3) with the outer surface exposed to the test spike (5.1.2). Tighten the nuts sufficiently to ensure no slippage of, or damage to, the specimen. Place the specimen and the clamping rings in the tensile testing machine (5.1.1). Advance the spike onto and through the specimen at a rate of (100 ± 10) mm/mm. It the spike fails to penetrate after a movement of 25 mm after contact with the specimen, the test is terminated. This shall be referred to in the test report.
Repeat the procedure on the remaining specimens.
Record for each test the maximum force (in newtons) needed to penetrate the specimen.
6 Calculation of results
Calculate the arithmetical mean of the maximum force (in newtons) needed to puncture the tour test specimens,
7 Test report
The test report shall include the following information:
the number and the date of this International Standard:
— all details necessary for the identification of the sample tested:
— the results obtained for each test specimen:
— the mean value iii newtons:
— any deviation from the procedure outlined In ISO 13996.