Document ID: chunk:federal_register_of_legislation:F2012C00357:front:0:p26
Version: federal_register_of_legislation:F2012C00357
Segment Type: other
Provision Reference: 
Character Range: 70611–73315

vertically in such a way as to prevent the load swaying and the belt twisting.  The attachment shall be fixed to the 5 daN load as in the vehicle.

           7.3.6. Before the actual start of the test, a series of 20 cycles shall be completed so that the self‑tightening system settles properly.

           7.3.7. 1,000 cycles shall be completed at a frequency of 0.5 cycles per second, the total amplitude being 300 + 20 mm.  The 5 daN load shall be applied only during the time corresponding to a shift of 100 + 20 mm for each half period.

7.4. Conditioning of straps and breaking‑strength test (static)

           7.4.1. Conditioning of straps for the breaking‑strength test

           Samples cut from the strap referred to in paragraph 3.2.4. above shall be conditioned as follows:

           7.4.1.1. Temperature‑conditioning and hygrometrics

           The strap shall be kept for at least 24 hours in an atmosphere having a temperature of 20  5 °C and a relative humidity of 65  5 per cent.  If the test is not carried out immediately after conditioning, the specimen shall be placed in a hermetically‑closed receptacle until the test begins.  The breaking load shall be determined within five minutes after removal of the strap from the conditioning atmosphere or from the receptacle.

           7.4.1.2. Light‑conditioning

           7.4.1.2.1. The provisions of Recommendation ISO 105‑BO2 (1978) shall apply.  The strap shall be exposed to light for the time necessary to produce a contrast equal to grade 4 on the grey scale on Standard Blue Dye No. 7.

           7.4.1.2.2. After exposure the strap shall be kept for a minimum of 24 hours in an atmosphere having a temperature of 20 + 5 °C and a relative humidity of 65 + 5 per cent.  If the test is not carried out immediately after conditioning the specimen shall be placed in a hermetically‑closed receptacle until the test begins.  The breaking load shall be determined within five minutes after removal of the strap from the conditioning installation.

           7.4.1.3. Cold‑conditioning

           7.4.1.3.1. The strap shall be kept for a minimum of 24 hours in an atmosphere having a temperature of 20 + 5 °C and a relative humidity of 65 + 5 per cent.

           7.4.1.3.2. The strap shall then be kept for one and a half hours on a plane surface in a low‑temperature chamber in which the air temperature is ‑30 + 5 °C.  It shall then be folded and the fold shall be loaded with a mass of 2 kg previously cooled to ‑30 + 5 °C.  When the strap has been kept under load for 30 minutes in the same low‑temperature chamber, the mass shall be removed and the breaking load shall be measured within 5 minutes after removal