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All material of any containers covering or wrapping should be free from substances, such as copper, naphthenates, creosote preservatives or films containing softening agents, having a degrading effect on the rubber products.
Rubber components packed in accordance with clause mentioned above should be stored indoors under the conditions given below.
Storage Conditions
1. Temperature
The storage temperature should be below 25 C and products should be stored away from direct sources of heat such as direct sunlight, boilers, radiators etc.
If the storage temperature is below 15 C, care should be exercised during the handling of stored products as they may have got stiff and become susceptible to distortion if not handled carefully. Temperature of these rubber products taken from the low-temperature storage should be raised to approximately 30 C throughout their mass, before the products are put into service conditions.
2. Humidity
The relative humidity must be such that, given the variations of temperature in storage, condensation does not take place.
In any event, the relative humidity of the atmosphere in storage should be less than 70 %, or, if polyurethanes are being stored, then less than 65 %.
3. Light
Rubber products should be protected from light sources, in particular direct sunlight or intense artificial light having a high UV rays content.
4. Radiation
In order to avoid damage to the stored rubber products, precautions has to be taken to protect these products from all sources of ionizing radiation
5. Ozone
As ozone is particularly harmful to rubber, storage rooms should not contain any equipment that is capable of generating ozone, such as mercury vapour lamps or high -voltage electrical equipment giving rise to electric sparksor silent electrical dischargs. The storage rooms must be excluded from Combustion gases and organic vapours, as they may give rise to ozone via photochemical processes.
6. Deformation
Rubber should be stored free from super imposed tensions and compressive stresses or other cause of deformations. Where products are packed in a strain-free condition, they should be stored in their original packaging. In case of doubt, the manufacturer's advice should be taken.
7. Contact with liquid and semi-liquid materials
Rubber products should not be allowed to come into contact with liquid or semi-liquid materials (for example, petrol, greases, acids, cleaning fluids) or their vapours at any time during storage, unless these materials are by design an integral part of the product or the manufacturer's packaging.
8. Contact with metals
Certain metals and their alloys (in particular, copper and manganese) are known to have deleterious effects on some type of rubbers. Rubber products should not be stored in contact with such metals except when bonded to them but should be protected by wrapping in or by separation with a layer of suitable material, e.g. polyethylene or paper.
9. Contact with dusting powder
Dusting powder should only be used for the packaging of rubber items in order to prevent blocking (see ISO 5978). In such cases, the minimum quantity of powder to prevent adhesion should be used. The powder used should be free from any constituent having a deleterious effect on the rubber or the subsequent application of the rubber item.
10. Contact between different products
Contact between products made from rubbers of different compositions must be avoided. This would include rubber products differing in colour only.
11 Products with rubber-to-metal bonded
The rubber of other products should not come in contact with the metal of rubber-to-metal bonded products. The preservative used on the metal should be such that it will not adversely affect the rubber or the bond to such an extent that it does not match with the product specification.
12 Proofed fabrics and rubber sheeting
Proofed fabrics and rubber sheeting less than approximately 1 m2 in area or less than approximately 2 m in length should be stored flat, ideally with the layers interleaved with a suitable material (see ISO 2230 / 5.2.). Sheets having larger areas and longer lengths of material should be rolled, with the layers interleaved with a suitable material.
13. Rotation of stocks
The products that are issued from the stores must be in strict rotation so that the products remaining in store are those of most recent manufacture or delivery.
14. Cleaning
Vulcanized rubber products have to be carefully cleaned. Soap water is the best cleaning agent available. Using of scouring agents, sharp edges and solvents, as trichloroethylene, carbon tetrachloride or hydrocarbon fluids, must be avoided. The cleaned products must be allowed to dry at room temperature. |
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