w3mobile下载AS 1180
Australian Standard ™
Methods of test for hose
made from elastomeric
materials
Second Group:
Methods 7A, 7B, 7C, 7D,
7F, 7G, 7J, 8A, 8B
(metric units)
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The following scientific,industrial and governmental organizations and departments were officially represented on the committee which prepared this standard:
Associated Chambers of Manufactures of Australia
Australian and New Zealand Railways Conferences
Country Roads Board,Victoria
Electricity Trust of South Australia
Government Stores Department,N.S.W.
The Institution of The Rubber Industry
Metropolitan Water,Sewerage and Drainage Board,Sydney
Petroleum Marketing Engineers Advisory Committee
Society of Automotive Engineers,Australasia
State Electricity Commission of Victoria
This standard is under continuous preparation by Committee RU/1,Rubber Hose,and
methods are being progressively approved for publication.Keeping Standards up-to-date
Standards are living
documents which reflect progress in science,technology and systems.To maintain their currency,all Standards are periodically reviewed,and new editions are published.Between editions,amendments may be issued.Standards may also be withdrawn.It is important
that readers assure themselves they are using a
current Standard,which should include any amendments which may have been
published since the Standard was purchased.Detailed information about
Standards can be found by visiting the Standards Australia web site at www.standards.au and looking up the relevant Standard in the on-line catalogue.Alternatively,the printed Catalogue provides information current at 1January each year,and the monthly magazine,The Australian Standard ,has a full listing of revisions and amendments published each month.We also welcome suggestions for improvement in our Standards,and especially encourage readers
to
notify us
immediately of any apparent inaccuracies or
ambiguities.Contact us via email at mail@standards.au,or write to the Chief Executive,Standards Australia International Ltd,GPO Box 5420,Sydney,NSW 2001.
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AS 1180—November 1972
2nd List
LIST OF METHODS
The methods so far published are:
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1AS 1180.7A—November 1972
STANDARDS ASSOCIATION OF AUSTRALIA
Australian Standard Methods of Test
for
HOSE MADE FROM ELASTOMERIC MATERIALS
METHOD 7A.RESISTANCE OF HOSE LINING AND COVER TO LIQUIDS
1SCOPE.This method determines the effect of specified liquid(s)on the lining and cover components of hose.2PRINCIPLE.Test pieces of lining and cover are immersed for a given time in the liquid after which the changes in volume and hardness are determined.3MATERIALS AND APPARATUS.
(i)Liquids as specified—a fresh portion for each test.
(ii)Vessels,inert to the liquids specified,of suitable size and shape to contain the test pieces and capa
ble of being sealed to prevent the escape of the liquid.(iii)Such apparatus as is required or specified for determining volume and hardness.(See AS 1180.9A.)4TEST PIECES.Prepare three rectangular test pieces of lining and of cover 50×25mm as follows:(i)Carefully remove from the hose sample the cover and lining,using,if necessary,very small amounts of a suitable solvent.Where solvent is used dry up to 36h.(ii)Buff the test specimen only to the extent necessary to obtain smooth faces or to
reduce to a
maximum
thickness
of
1.6mm.The thickness of test specimen shall
be uniform to within ±0.13mm while that of specimens prepared from the same
sample shall be of the same thickness within ±0.25mm.(iii)From the test specimens of lining and cover cut the three test pieces of each to the required dimensions with one stroke using a suitable di
e.N OTE :Should it be impossible to obtain test pieces having a buffed thickness of 0.80mm or greater,the manufacturer may be obliged to furnish a sample of the cured elastomer taken from the same quality of rubber from which the hose was made and having a cure equivalent to that to which the hose was subjected.
5CONDITIONING OF TEST SPECIMEN AND PIECES.Conditioning shall be
at 20±2°C and 65+10per cent relative humidity for at least 4h.a
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AS 1180.7A—November 19722
6PROCEDURE.
6.1For Test Materials Immiscible or Non-Reactive with Water.
(i)Determine the hardness of the test pieces by the test of AS 1180.9A and obtain the mean values for both the lining and the cover.(ii)Weigh each test specimen or piece to the nearest milligram in air (W ),and then in distilled water (W 2),ensuring removal of all air bubbles.
Bubbles can be eliminated by adding a trace of surface-active agent,  e.g.detergent,to the water.(iii)Dry each test specimen or piece by blotting with filter paper or a textile fabric that does not deposit lint.(iv)Place the
three specimens
or
pieces separated
in the container and add test material (at least 15times the volume of the test specimens or pieces)with an
excess such as to keep them totally immersed.N OTES :
1.Place only test specimens or pieces from the same vulcanizote in any one container.
2.If necessary provide a means for holding the test specimens or pieces completely below the surface.
(v)Allow to stand at a temperature of 20±2°C for the specified time and remove the pieces.(vi)Remove the specimens or pieces and remove the test material from each.
N OTES :
1.If the immersion liquid is appreciably volatile at room temperature the maximum time for transference of each test specimen or piece after removal should be 30seconds.
2.The method of removing the surplus will vary with the nature of the material.With mobile liquids such as iso-octane and benzene,remove and quickly wipe the test specimen or piece with a filter paper or piece of textile which does not deposit lint.Some difficulty may be experienced in completely removing viscous,non-volatile oils by this method and it may be necessary to dip the test piece quickly in a suitable volatile liquid such as acetone which does not deposit lint.
(vii)Repeat step (i).
(viii)Transfer each test specimen or piece to a tared,stoppered weighing bottle and determine its weight in air to the nearest milligram (W 3).Remove from the bottle and immediately determine its weight (W 4)in distilled water at
20±2°C.6.2For Test Materials Miscible (or Reactive)with Water.Follow the procedure in 6.1above with the following amendments:(i)If the test material is not too viscous or volatile conduct weighings W 2and W 4in the test material instead of in water and use these weighings to determine ∆V by
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