BS ISO 17464:2016 pdf download

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BS ISO 17464:2016 pdf download

BS ISO 17464:2016 pdf download.Pneumatic tubes for automotive vehicles — Technical requirements and test methods
1 Scope
This International Standard specifies the technical requirements and test methods for tubes of pneumatic tyres for automotive vehicles.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 3877-3, Tyres, valves and tubes — List of equivalent terms — Part 3: Tubes
ISO 9413, Tyre valves — Dimensions and designation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3877-3 apply.
4 Materials, form and fit
4.1 The tubes shall be manufactured from an appropriate rubber compound and vulcanized to an endless annular ring shape and shall be with a valve or spud conforming to ISO 9413.
4.2 The tubes shall be classified into the following two classes:
a) class A – natural rubber and its derivatives and blends;
b) class B – butyl rubber/halobutyl rubber and its derivative and blends.
4.2.1 A blend shall be named after prime rubber whose percentage by volume is more than 60 % in the compound.
4.3 The tube shall be uniform in thickness, free from flaws and designed to fit in a tyre of the corresponding nominal size.
4.3.1 Thickness uniformity
Except for the region at or near lap or splice, the thickness of the tube when measured along the longitudinal direction of the tube shall not vary from the arithmetic mean of the readings by ±17,5 % at any point.
4.3.2 The arithmetic mean of the tube thickness shall be determined for the points which lie in the same circumferential line or the length of the tube (see Figure 1). The thickness variation shall be determined for circumferential line at the crown centre.
5 Test requirements
5.1 Each type of tube shall conform to the following requirements.
5.1.1 Elongation
Dumbbell test pieces punched out in circumferential direction of the tube when tested in accordance ISO 37 and Annex A shall have elongation at break not less than 500 % for “class A” tubes and not less than 450 % for “class B” tubes.
5.1.2 Strength of splice
Tensile strength of splice determined on dumbbell in accordance with ISO 37 and Annex A shall not be less than 85 kgf/cm 2 for “class A” tubes and 35 kgf/cm 2 for “class B” tubes.
5.1.3 Set after ageing
Dumbbell test pieces punched out in circumferential direction of the tube when subjected to test conditions and test procedure in accordance with Annex B shall have set after ageing not more than 25 % for “class A” tubes and not more than 35 % for “class B” tubes.
5.1.4 Accelerated ageing
Dumbbell test pieces punched out in circumferential direction of the tube body when subjected to accelerated ageing test at (100 ± 2) °C for 48 h and tested in accordance with ISO 37, ISO 188 and Annex C shall not have a percentage drop in elongation at break more than 35 % from original, for both “class A” and “class B” tubes.