BS ISO 3302-1:2014 pdf free.Rubber – Tolerances for products Part 1: Dimensional tolerances.
This part of ISO 3302 specifies classes of dimensional tolerances and their values for moulded, extruded, and calendared solid rubber products. The relevant test methods necessary for the establishment of compliance with this part of ISO 3302 are also specified.
The tolerances are primarily intended for use with vulcanized rubber but can also be suitable for products made of thermoplastic rubbers.
This part of ISO 3302 does not apply to precision toroidal sealing rings or to calendared composite products such as rubber-coated fabrics or products where a rubber coating is applied by the process of topping or skim coating.
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 3, Preferred numbers — Series of preferred numbers
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 1RHD)
ISO 2230, Rubber products — Guidelines for storage
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Measurement of dimensions
3.1 General
For solid products, measurements of dimensions shall not be made until 16 Ii have elapsed after vulcanization, this minimum time is being extended to 72 h in cases of dispute. Measurements shall be completed within 3 months after the date of despatch to the purchaser or before the product is put into use, whichever is the shorter time. Measurements shall be made at standard temperature, after conditioning, in accordance with ISO 23529. Care shall be taken to ensure that the products are not subjected to adverse storage conditions in accordance with ISO 2230, and that they are not distorted during measurement.
3.2 Test instruments
3.2.1 Depending on the circumstances, measurements shall be made using one or more of the following types of instrument. For solid products, a micrometre dial gauge, the foot of which shall exert a pressure of
22 kPa ± 5 kPa for rubber of hardness equal to or greater than 35 IRHD or of 10 kPa ± 2 kPa for rubber of hardness less than 35 IRHD as specified in ISO 23529 and ISO 48. A suitable optical measuring instrument. Fixed gauges, for upper and lower limits appropriate to the dimensions being measured. Other devices, including tape measures (with or without vernier), sliding calipers, and micrometre calipers.
3.2.2 All instruments shall be capable of measuring the dimension with an error within the tolerances specified.
3.2.3 In all measurements intended to be comparative, the same measuring device shall he used.
4 Tolerances
For the purposes of this part o1 ISO 330Z, nominal dimensions and tolerances are based on the R 5 and R 10 series of preferred numbers, respectively, in accordance with ISO 3.
The dimensions of certain parameters of a particular product may not all require the application of the same class of tolerance. Dimensions of different parameters of the product on the same drawing can have different class tolerances applied to them. When drawings do not indicate a class tolerance, the largest tolerance given in the related table shall be applied.BS ISO 3302-1 pdf free download.