ISO 3865-2020 pdf free.Rubber, vulcanized or thermoplastic — Methods of testfor staining in contact with organicmaterial.
All mixing shall be carried out in a thoroughly cleaned mixer, preferably in accordance with ISo 2393.The rubber shall be sheeted out to a thickness of 2,0 mm  0,2 mm, and protected on both sides by aninert material, such as starched cambric fabric or polyethylene sheet, until tested. A test piece shal becut out to the required mould dimensions.The rubber veneer shall be calendered to a thickness of 0,5 mm± 0,05 mm and stiffened on at least oneside with a protective aluminium sheet.
At the time of coating, one protective layer shall be removed from both the test rubber and the veneer,and the two exposed surfaces pressed firmly together, ensuring that the aluminium sheet remains onthe external side of the rubber veneer.Pressure may be applied by a platen press or by rollers.
The composite body, including the aluminium sheet, shall be moulded and vulcanized in a platen press,taking care that the veneer and aluminium sheet are situated at the bottom side of the mould. Theconditions of vulcanization shall be included in the test report. The protective surface on the veneershall be left until used. Lacquered test pieces:Test pieces shall be immersed in a white, non-staining lacquer at a depth of 25 mm.The test pieces shallbe hung on a suitable rack and dried.After drying, they shall be immersed a second time in the lacquer,then dried until the surface is non-tacky.
Instead of lacquer, a paste prepared of the unvulcanized veneer in a suitable solvent (volume ratio 1:6)may be used.The procedure shall be the same as for lacquer.Aluminium foil dipped in the lacquer/paste may be used as a blank.
The thickness of the lacquer and paste layer shall be agreed between the interested parties. If nototherwise specified, the thickness of the lacquer layer shall be about 0,1 mm, and the thickness of thepaste layer shall be about 0,16 mm.
Blanks shall be prepared and treated in the same manner as the samples to be tested, except thatthe rubber to be tested shall be replaced by an inert material.A suitable inert material, such as analuminium sheet about 0,4 mm to 0,6 mm thick, may be used as an alternative to the rubber slab.
Reference samples shall be prepared in the same way and with the same construction as the samplesto be tested (6.1 to 6.3), but shall be protected from irradiation in an appropriate manner, i.e. by anappropriate covering during the irradiation exposure period.Also, part of the sample can be covered toact as a reference sample.ISO 3865 pdf download.