BS/EN 4708-001-2019 pdf download.Aerospace series – Sleeving, heat-shrinkable, for binding, insulation and identification Part 001: Technical specification.
4.3 Dimensions
See product standard
4.4 Shrink ratio
See product standard.
4.5 Temperature range
See product standard.
4.6 Shelf life
The use by date Is the shelf life when stored under the conditions recommended in Annex A.
The use by date shall be the guaranteed minimum storage time for which the sleeving retains the as supplied internal diameter. Following unrestricted shrinkage in accordance with the product standard, the sleeving shall conform to the internal diameter and wall thickness requirements as specified in the product standard.
In the event that the shelf life specimens fail the requirements of the product standard, delivery of any product still held by the manufacturer or distributors shall be halted until samples of each batch in storage are tested to confirm that they satisfy the original recovery qualification requirements, after which release can be resumed. In the event of failure the Approval Authority is to be notified.
4.7 Colours
See product standards for available colours. The colours shall be a reasonable match to one of those specilled in IEC 60304.
4.8 Standard cutting tolerances for cut lengths of sleeving See Table 1.
Sufficient quantities of each of the sleeves used for qualification shall be retained to provide the test samples for the conducting of the shelf life test for 60 months. Shorter if specified in the product standard Tests shall be conducted at 12 monthly intervals. The sleeves shall be stored at a temperature of (23 ± 3) °C and a relative humidity between 45 % and 75 %. Measure the as supplied internal diameter and then fully recover the sleeves in accordance with the product standard. Measure the recovered internal diameter and wall thickness .The measurements shall be made in accordance with fEC 60684-2, Clause 3.
6.2 Scrape abrasion
6.2.1 Apparatus
Shall be in accordance with EN 6059-403 except that the test mandrels shall be a smooth metal mandrel.
6.2.2 Preparation of specimens
Two (2) sleeves 200 mm in length shall be recovered onto test mandrels of diameter as follows:
Specimen A: 10 % greater than the minimum internal diameter of the fully recovered sleeving as specified in the product standard.
Specimen B: 10% smaller than the maximum internal diameter of the as supplied sleeving as specified in the product standard.
6.2.3 Method
The test shall be conducted at ambient temperature with the size and load as specified in the product standard.
The test shall be conducted without the electrical Contact between the needle and the test mandrel. Each cycle shall consist of the forward and backward movement of needle. The action should continue until the needle rubs through the sleeve maxing contact with the mandrel or the number of cycles exceeds 10 times the required average number of cycles specified in the product standard. The number of cycles shall be recorded.
Four (4) tests shall be carried out on each specimen whereby for each test the specimen is moved forward approximately 30 mm and rotated through 90 degrees.
Calculate the arithmetic mean of the eight (8) measurements from the two (2) specimens. Recalculate the arithmetic mean by ignoring all the values greater than the original mean. This shall be recorded as the result.
8.1.2 Qualification conditions
The sleevings shall be submitted for quahflcatlon tests on spools. in coils or sufficient cut lengths.
Each spool. coil or sufficient cut length shall have a label containing information given in 9.1.
8.1.3 QualificatIon tests
See Table 2.
Qualification tests shall be performed on sizes taken from the top, middle and bottom of the manufacturer or supplier’s range for each different material, unless otherwise indicated in Table 2.
Select samples for the shelf life tests. Due to the duration of this test approval may be granted prior to completion. Approval shall be granted subject to the provisions of 4.6 and will be subject to review on Completion.
8.2 Maintenance of qualification
8.2.1 PerIodic tests
See Table 2, tests shall be successfully carried out every 60 months for products in production or when production is restarted following a production stoppage of greater than 36 months.
The maintenance qualification tests shall be performed on specimens taken at random in accordance with
EN 9133.
8.3 Routine tests
8.3.1 Delivery conditions
See Table 2.
The production routine tests shall be applied to samples, taken at random, from every batch, either compound or sleeving, and shall consist of the tests listed in Table 2. The tests for compound batches shall be applied to the first sleeving produced from each compound batch.
Samples of sleeving or compound shall be selected from each batch and subjected to the tests detailed in Table 2 before release.BS/EN 4708-001-2019 pdf download.