BS 1970:1984 download free.Specification for Rubber hot water bottles.
1 Scope
BS 1970 specifies requirements for the physical properties and performance of rubber hot water bottles designed for complete or partial filling with hot water and fitted with screw stoppers or push-in stoppers.
NOTE The titles of the publications referred to in BS 1970 are listed on the inside back cover.
2 Physical properties
2,1 General appearance. When inspected visually, the bottle shall be free from porosity, inclusions of foreign matter, tears and blisters.
2.2 Thickness. The rubber shall at no point have a thickness less than that shown in Table 1, according to the capacity of the bottle.
Thickness shall be determined by the method described in Appendix A and the capacity by the method in Appendix B.
3 Performance
3.1 Leakage. Each hot water bottle shall show no visible leakage when inflated with air to a pressure of 14 kPa and immersed in water for a minimum time of 5 s.
3.2 Tensile stress-strain properties
3.2.1 General. The tensile properties as specified in 3.2.2, 3.2.3 and 3.2.4 shall be determined in accordance with BS 903-A2. Type I dumb-bell test pieces shall be used, or type 2 dumb-bell test pieces if the shape of the bottle is such that type 1 dumb-bells cannot be cut from it.
NOTE BS 903.A2 includes requirements for the maximum time between vulcanization and testing.
If it is necessary for test. pieces to be buffed, values of 80 % of those specified in 3.2.2, 3.2.3 and 3.2.4 shall be deemed to meet the requirements of this standard.
3.2.2 Tensile stress-strain properties before ageing. The tensile strength shall be not less than 14 MPa and the elongation at break shall be not less than 500 % when tested in accordance with
BS 903-A2.
3.2.3 Tensile stress-strain properties after ageing. After ageing in an oven for 168 h at a temperature of 70 ± 1 °C in accordance with BS 903-A19, the tensile strength shall be not less than 10.5 MPa and the elongation at break shall be not less than 425 % when tested in accordance with BS 903-A2.
3.2.4 Tensile stress-strain properties after immersion. After continuous immersion of the test pieces in water for 96 h at a temperature of 70 ± 1 °C, the tensile strength shall be not less than 10.5 MPa and the elongation at break shall be not less than 425 % when tested in accordance with BS 903A2 and as follows.
Measure the test pieces before immersion in the water. After the immersion period, store the test pieces in water at 23 ± 2 °C for a period of not less than 16 h and not more than 96 h before testing. Remove all free surface moisture from the test pieces with a suitable absorbent before testing.
3.3 Tension set. The tension set shall be not more than 20 % of the original length when determined in accordance with Appendix C.
3.4 Strength of bonded seams. If present, bonded seams shall withstand a maximum applied force of not less than 72 N when tested in accordance with Appendix D.
4 Closures
4.1 General. The hot water bottle shall be provided with a closure which, when tested in accordance with both methods in Appendix E, shall show no visible leakage and no visible damage to the closure.
4.2 Rubber components. If a rubber plug is provided or a rubber washer is used as part of a screw stopper, the rubber shall have a hardness of between 55 IRHD and 80 IRHD, when determined in accordance with method N in BS 903-A26. The rubber compound from which a plug or washer is manufactured shall have a compression set of not greater than 30 %, when determined in accordance with BS 903-A6 for 24 h with a temperature of 70 ± I °C maintained during the compression period using type 1 test pieces.
The rubber washer shall not exhibit a loss of thickness greater than 30 % after testing in accordance with E.3.
5 Marking
Each hot water bottle shall be legibly and permanently marked with the number and date of BS 1970, i.e. BS 197O:1984, and additionally with the following in the form of a simple code:
a) name or trade mark of the manufacturer or supplier;
b) month and year of manufacture (last digit only).
For example, a trade mark, month June and year 1984:
6 Informative labelling
6.1 General. Each hot water bottle shall be accompanied by the identification of the UK manufacturer, or the UK supplier of bottles manufactured overseas.
6.2 Hot water bottles with screw stoppers. Each hot water bottle shall be accompanied by at least the Collowing instructions, depending on the design designated by the manufacturer. Either.
a) Hot water bottles designed for partial filling. “When filling this hot water bottle do not use boiling water and only fill to a maximum of two-thirds capacity. Fill the bottle in an upright position holding it by the neck. Expel air from the bottle by lowering it carefully onto a flat surface until water appears at the opening”.
b) Hot water bottles designed to be completely filled. “When filling this hot water bottle do not use boiling water. Fill the bottle in an upright position holding it by the neck until water appears at the opening”.
and:
c) “Screw the stopper sufficiently tight to ensure that there is no leakage. Finger tight. should he adequate.
Do not let the bottle come into contact with hot surfaces.
Avoid contact with oil or grease.
When not in use drain completely and store with the stopper removed in a cool, dry, dark place. Do not place anything on top of the bottle.
Check the stopper components at regular intervals.”
6.3 Hot water bottles with push-in rubber stoppers
Each hot water bottle shall be accompanied by at least the instructions specified in 6.2, except that the sentences I and 2 of 6.2 c) shall be replaced by the following instructions.
Insert the rubber stopper into the neck of the filled hot water bottle and press firmly until fully home, Turn the skirt of the stopper down over the neck.
7 Packaging
If a flexible film bag is used for packaging, the following warning shall be printed on the film in the format given:
PLASTIC BAGS CAN BE DANGEROUS TO AVOID DANGER OF SUFFOCATION KEEP THIS BAG AWAY FROM BABIES AND CHILDREN”.