SIST EN ISO 19932-2:2013
(Main)Equipment for crop protection - Knapsack sprayers - Part 2: Test methods (ISO 19932-2:2013)
Equipment for crop protection - Knapsack sprayers - Part 2: Test methods (ISO 19932-2:2013)
This part of ISO 19932 specifies test methods for the verification of requirements of ISO 19932-1 for knapsack sprayers carried on the back or shoulder of the operator for use with plant protection products. It is applicable to lever-operated knapsack sprayers, knapsack compression sprayers and knapsack sprayers driven by an engine or electric motor using hydraulic pressure atomization of the spray liquid, with a nominal volume of more than 3 l for their intended use primarily in agriculture and horticulture. It does not apply to knapsack mistblowers covered by ISO 28139.
Pflanzenschutzgeräte - Tragbare Geräte - Teil 2: Leistungsmerkmale (ISO 19932-2:2013)
Dieser Teil der EN ISO 19932 legt Prüfverfahren für tragbare Geräte fest, die vom Bediener zur Anwendung mit Pflanzenschutzprodukten auf dem Rücken oder der Schulter getragen werden.
Die vorliegende Norm gilt für tragbare Sprühgeräte, die mit einem Hebel betätigt werden, Drucksprühgeräte sowie Sprühgeräte, die von einem Verbrennungsmotor oder einem Elektromotor angetrieben werden und die hydraulische Druckzerstäuber für Sprühflüssigkeiten verwenden, mit einem Nennvolumen von mehr als 3 l, deren Verwendung beispielsweise in der Landwirtschaft und im Gartenbau vorgesehen ist.
Sie gilt nicht für tragbare Nebelsprühgeräte.
Matériel de protection des cultures - Pulvérisateurs à dos - Partie 2: Méthodes d'essai (ISO 19932-2:2013)
L'ISO 19932-2:2013 spécifie des méthodes d'essai pour la vérification des exigences de l'ISO 19932‑1 relatives aux pulvérisateurs à dos destinés à être utilisés avec des produits de protection des cultures et que l'opérateur porte sur le dos ou l'épaule.
Elle est applicable aux pulvérisateurs à dos à pression entretenue, aux pulvérisateurs à dos à pression préalable et aux pulvérisateurs à dos entraînés par un moteur ou un moteur électrique utilisant la pulvérisation sous pression hydraulique du liquide à pulvériser, dont le volume nominal est d'au moins 3 l, dans le cadre de leur usage prévu, en particulier en agriculture et en horticulture.
Elle n'est pas applicable aux nébulisateurs à dos selon l'ISO 28139.
Oprema za zaščito poljščin - Nahrbtni škropilniki - 2. del: Preskusne metode (ISO 19932-2:2013)
Ta del ISO 19932 določa preskusne metode za preverjanje zahtev ISO 19932-1 za nahrbtne škropilnike, ki jih izvajalec nosi na hrbtu ali ramah za uporabo z izdelki za zaščito rastlin. Velja za nahrbtne škropilnike s krmilno ročico, nahrbtne batne škropilnike in nahrbtne škropilnike z motorjem ali elektromotorjem, ki ga poganja atomizacija s pomočjo hidravličnega tlaka razpršene tekočine, ki imajo nazivno prostornino večjo od 3 l ter se predvidevajo zlasti za uporabo v kmetijstvu in vrtnarstvu. Ne velja za nahrbtne škropilnice, ki jih zajema ISO 28139.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 19932-2:2013
01-september-2013
2SUHPD]D]DãþLWRSROMãþLQ1DKUEWQLãNURSLOQLNLGHO 3UHVNXVQHPHWRGH ,62
Equipment for crop protection - Knapsack sprayers - Part 2: Test methods (ISO 19932-
2:2013)
Pflanzenschutzgeräte - Tragbare Geräte - Teil 2: Leistungsmerkmale (ISO 19932-
2:2013)
Matériel de protection des cultures - Pulvérisateurs à dos - Partie 2: Méthodes d'essai
(ISO 19932-2:2013)
Ta slovenski standard je istoveten z: EN ISO 19932-2:2013
ICS:
65.060.40 Oprema za nego rastlin Plant care equipment
SIST EN ISO 19932-2:2013 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 19932-2:2013
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SIST EN ISO 19932-2:2013
EUROPEAN STANDARD
EN ISO 19932-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2013
ICS 65.060.40
English Version
Equipment for crop protection - Knapsack sprayers - Part 2: Test
methods (ISO 19932-2:2013)
Matériel de protection des cultures - Pulvérisateurs à dos - Pflanzenschutzgeräte - Tragbare Geräte - Teil 2:
Partie 2: Méthodes d'essai (ISO 19932-2:2013) Prüfverfahren (ISO 19932-2:2013)
This European Standard was approved by CEN on 8 May 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19932-2:2013: E
worldwide for CEN national Members.
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SIST EN ISO 19932-2:2013
EN ISO 19932-2:2013 (E)
Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC on machinery and Directive 2009/127/EC
amending Directive 2006/42/EC with regard to machinery for pesticide application .4
2
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SIST EN ISO 19932-2:2013
EN ISO 19932-2:2013 (E)
Foreword
This document (EN ISO 19932-2:2013) has been prepared by Technical Committee ISO/TC 23 "Tractors and
machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2013, and conflicting national standards shall be withdrawn
at the latest by December 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 19932-2:2013 has been approved by CEN as EN ISO 19932-2:2013 without any modification.
3
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SIST EN ISO 19932-2:2013
EN ISO 19932-2:2013 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC on machinery
and Directive 2009/127/EC amending Directive 2006/42/EC
with regard to machinery for pesticide application
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 2006/42/EC on machinery and Directive 2009/127/EC amending Directive
2006/42/EC with regard to machinery for pesticide application.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the normative clauses of
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the
relevant Essential Requirements of Directives 2006/42/EC and 2009/127/EC and associated EFTA
regulations.
NOTE The main function of ISO 19932-2 is to provide test procedures for the verification of the
requirements of ISO 19932-1. Compliance with ISO 19932-1 and ISO 19932-2 is necessary to achieve
presumption of conformity with the Essential Requirements of Directive 2006/42/EC and Directive
2009/127/EC and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.
4
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SIST EN ISO 19932-2:2013
INTERNATIONAL ISO
STANDARD 19932-2
Second edition
2013-06-01
Equipment for crop protection —
Knapsack sprayers —
Part 2:
Test methods
Matériel de protection des cultures — Pulvérisateurs à dos —
Partie 2: Méthodes d’essai
Reference number
ISO 19932-2:2013(E)
©
ISO 2013
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test liquids and equipment . 1
5 General . 2
5.1 Test conditions . 2
5.2 Sprayer . 2
5.3 Functional tests . 2
5.4 Pressure test . 5
5.5 Leakage test . 6
5.6 Centre of gravity . 6
6 Specific tests for lever-operated knapsack sprayers . 7
6.1 Preconditioning . 7
6.2 Drop test . 8
7 Specific tests for engine- or motor-driven knapsack sprayers . 9
7.1 Volume of external surface deposit . 9
7.2 Volume of total residual liquid . 9
8 Specific tests for compression sprayers .10
8.1 Volume test .10
8.2 Drop test .11
9 Test report .11
Annex A (informative) Example of a preconditioning device .12
Annex B (informative) Example of a shut-off test device .13
Annex C (informative) Example of a strap test device .14
Annex D (informative) Example of drop test device .15
Annex E (informative) Example of filling device .16
Annex F (normative) Minimum content of test report .17
© ISO 2013 – All rights reserved iii
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 6, Equipment for crop protection.
This second edition of ISO 19932-2, together with ISO 19932-1, cancels and replaces ISO 19932-1:2006
and ISO 19932-2:2006, which have been technically revised.
ISO 19932 consists of the following parts, under the general title Equipment for crop protection —
Knapsack sprayers:
— Part 1: Safety and environmental requirements
— Part 2: Test methods
iv © ISO 2013 – All rights reserved
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Introduction
The application of plant protection products with knapsack sprayers should take into consideration
biological, economic, environmental and operator issues.
The aim of this part of ISO 19932 is to specify test methods for the verification of requirements for
equipment to ensure safe use and protect the environment.
Implementation of parts 1 and 2 of ISO 19932 should achieve an appropriate level of operator safety and
avoid unnecessary dispersal of plant protection products into the environment.
© ISO 2013 – All rights reserved v
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SIST EN ISO 19932-2:2013
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SIST EN ISO 19932-2:2013
INTERNATIONAL STANDARD ISO 19932-2:2013(E)
Equipment for crop protection — Knapsack sprayers —
Part 2:
Test methods
1 Scope
This part of ISO 19932 specifies test methods for the verification of requirements of ISO 19932-1 for
knapsack sprayers carried on the back or shoulder of the operator for use with plant protection products.
It is applicable to lever-operated knapsack sprayers, knapsack compression sprayers and knapsack
sprayers driven by an engine or electric motor using hydraulic pressure atomization of the spray liquid,
with a nominal volume of more than 3 l for their intended use primarily in agriculture and horticulture.
It does not apply to knapsack mistblowers covered by ISO 28139.
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 5681:1992, Equipment for crop protection — Vocabulary
ISO 19932-1:2013, Equipment for crop protection — Knapsack sprayers — Part 1: Safety and
environmental requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5681 and ISO 19932-1 apply.
4 Test liquids and equipment
4.1 Water, clean and free from solids.
4.2 Preconditioning device, allowing holding of the sprayer and the operation of the lever-operated
knapsack sprayer pump lever continuously. The stroke and frequency shall be adjustable. An example is
given in Annex A.
4.3 Shut-off device test equipment, consisting of a frame to fix the hand-held part of the shut-off device
and a unit for moving the shut-off device control, e.g. valve lever, to open it periodically with an induced
flow at the prescribed rate and pressure. The stroke shall be adjustable. An example is given in Annex B.
4.4 Strap test device, capable of dropping the sprayer, vertically guided, onto each strap from a height
of 200 mm using a horizontal restraining bar that is 75 mm in diameter. The device is to be capable of
testing sprayers with one or two upper and/or lower fixing points. An example is given in Annex C. Other
devices with equivalent performance can be used.
WARNING — This test device presents an element of risk when the test is underway. All personnel
shall either be kept out of the test area or otherwise protected from hazards such as parts
displaced from the sprayer on test.
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
4.5 Drop test device, to drop the upright sprayer, vertically guided, from a height of (600 ± 20) mm
onto a flat level surface, 800 mm x 800 mm x 50 mm in height, made of high density polythene (HDPE) or
hard wood placed on a flat level floor. The device shall not affect the impact force of the dropped sprayer.
An example is given in Annex D. Other devices with equivalent performance can be used.
4.6 Filling device, by which the volume and flow of water or test liquid can be controlled and adjusted.
An example is given in Annex E. Other devices with equivalent performance can be used.
4.7 Weighing devices, with the ability to weigh up to:
a) 25 kg with a maximum error of ± 1 g;
b) 2 kg with a maximum error of ± 0,1 g.
4.8 Measuring cylinder, for measuring volumes of up to 1 l with a maximum error of ± 10 ml.
4.9 Timer (stop watch), with a maximum error of ± 0,5 s for measuring periods up to 5 min.
4.10 Pressure supply device, to place the sprayer under pressure using air or water. The pressure shall
be adjustable up to 10 bar with a maximum error of ± 5 % of the measured value.
4.11 Pressure gauges, to measure between 0 bar and 25 bar with a maximum error of ± 0,15 bar
(equivalent to a class 0,6 pressure gauge according to EN 837-1).
4.12 Polythene bags, the size of which shall be at least 30 cm x 40 cm.
4.13 Polythene sheets, the size of which shall be at least 2 m x 1 m.
5 General
5.1 Test conditions
The tests shall be performed with one new specimen of the sprayer type at an air temperature of 10 °C
to 30 °C and relative air humidity of at least 30 %, with no influence of wind or sunlight.
5.2 Sprayer
Assemble the knapsack sprayer in accordance with the instruction handbook. Inspect for tightness of
the filling cap, gland nut and other operator controlled couplings. Weigh the complete empty sprayer
using a weighing device [4.7 a)] and record the mass in kilograms.
5.3 Functional tests
5.3.1 Shut-off device reliability
Detach the shut-off device assembly with the spray lance from the sprayer and mount it on a frame (4.3).
Connect the shut-off device to a pressurized water supply of (3 ± 0,2) bar. Fully activate the shut-off
device using a frequency of (15 ± 5) cycles/min for a total duration of 25 000 cycles. Inspect functionality
and record any leakage occurring within 1 min ± 5 s after completion of the last cycle.
5.3.2 Spray liquid output
The spray liquid output rate q of the sprayer for each combination of nozzle/pressure regulator
m
supplied for use with the sprayer shall be measured with a maximum error of ±1 % at the optimum spray
pressure specified in the instruction handbook or at the setting specified in the instruction handbook.
2 © ISO 2013 – All rights reserved
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Record the spray liquid output and calculate the percentage deviation σ from the values q specified in
s
the instruction handbook using the following equation:
q
m
σ =×100%
q
s
5.3.3 Load carrying straps and their fixation points
WARNING — This test has an element of risk. All personnel shall either be kept out of the test
area or otherwise protected from hazards such as parts displaced from the sprayer on test.
Fill the spray tank with water so that the total mass of the sprayer is 7 kg ± 10 g. If the empty mass of
the sprayer is over 7 kg the test shall be carried out with the sprayer empty and if the maximum mass of
the sprayer filled to the nominal volume is below 7 kg record the mass and test at this mass. Attach the
sprayer to a strap test device (4.4) so that each load carrying strap can be tested individually. From the
position where the sprayer is carried by a strap in the device, lift the sprayer vertically (200 ± 20) mm
and let the sprayer drop. Repeat this 10 times for each load carrying strap.
Inspect for damage.
5.3.4 Stability
Position the empty sprayer on a flat hard surface with an incline of 8,5° ± 0,2° so that the load carrying
straps are facing down the slope. Set any lever and the lance in their park position. If there are no park
positions, set the lever in its highest position with the lance down the slope.
Check the stability of the sprayer by rotating it at 90° intervals.
Repeat the test with the spray tank filled to the nominal volume.
Record any position in which the sprayer is not stable.
5.3.5 Contents gauge scale and total volume
Place the empty sprayer in an upright position on a flat horizontal surface with any lever in the park position.
Measure and record the volume between the graduations on the spray tank contents gauge scale when
filling the spray tank using a measuring cylinder (4.8) or using a device (4.7). Continue until the spray
tank is filled to its nominal volume.
Determine the scale error E in percentage using the following equation:
VV−
sm
E= ×100%
V
s
where
V is the volume according to the spray tank scale, in millilitres (ml);
s
V is the measured volume of water filled into the spray tank, in millilitres (ml).
m
As a second part of the test, fill the spray tank to the upper edge of the filling opening.
For lever-operated sprayer and engine- or motor-driven sprayers, insert the filling filter and close
the tank lid.
For compression sprayers, insert and tighten the air pump and remove all liquid from an integrated filling
funnel. If the filling opening is situated below any parts of the spray tank, so that air pockets are formed,
remove the hose and fill the sprayer through the spray tank outlet opening with air pump mounted.
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Weigh the sprayer using a device according [4.7 a)].
Determine the total volume V by the difference between the mass of the completely filled sprayer and
t
the mass registered in 5.2.
Calculate the additional volume V of the spray tank in percentage using the following equation:
A
VV−
t n
V = ×100%
A
V
n
where V is the nominal volume.
n
5.3.6 Filling rate
This test shall be carried out on a complete sprayer, empty at the start of the test, as described in 5.2.
Wash all external surfaces of the sprayer with a non-ionic surfactant aqueous solution of 0,5 % and
then dry them.
Put any lever and spray lance in the park position. Remove the spray-tank lid or the air pump, as
appropriate, but keep the filling filter in position.
Position the sprayer in the centre of a polythene sheet (4.13).
Position a filling device (4.6)with its outlet placed 100 mm above the filling opening. The sprayer shall
be positioned with its straps opposite to the filling device with the line connecting the upper strap fixing
points orientated perpendicularly to the axis of the filling device (see Annex E). The impact point of the
test liquid shall be the middle of the filling opening.
Fill the filling device with a volume of water to its maximum volume without overspill.
Pour a volume of water that equates to the nominal spray-tank volume from the filling device into the
filling opening of the sprayer to simulate filling of the sprayer. The flow rate from the filling device shall be
such that the nominal tank volume will be poured within 60 s with a maximum flow rate deviation of 10 %.
Wipe off any external residues on the sprayer with a tissue. Determine the amount of splashes as the
mass of the collected splashes on the polythene sheet (4.13) and the tissue, considering their tare, using
a weighing device [4.7 b)].
5.3.7 Emptying
This test shall be carried out on a complete sprayer, empty at the start of the test, as described in 5.2.
Fill the sprayer with water to its nominal volume. Drain the sprayer in accordance with the instruction
handbook. Fill the sprayer again and drain according to the instruction handbook and then weigh it
using a weighing device [4.7 a)].
Determine the amount of liquid remaining in the sprayer as the difference between the mass of the
drained sprayer and the mass recorded before it was filled with water.
5.3.8 Absorbency of carrying straps
This tests shall be performed at an air temperature of 20 °C to 25 °C and relative air humidity of 50 % to 70 %.
Remove the carrying straps, and any padding and any metal or plastic parts attached to them before
immersion (in order to minimize, as far as possible, the dry mass of the straps) and weigh them dry
using a weighing device [4.7 b)]. Completely immerse the straps in water for 2 min. Remove the straps
from the water, shake off surplus liquid and hang freely to drain for 10 min before re-weighing.
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SIST EN ISO 19932-2:2013
ISO 19932-2:2013(E)
Calculate the mass increase Δm in percentage using the following equation:
mm−
ab
Δm= ×100%
m
b
where
m is the mass before the test;
b
m is the mass after the test.
a
NOTE The test method will be revised when sufficient data are available.
5.3.9 Test for compatibility of sprayer components
WARNING — Care should be taken when doing this test, as the test liquids are potentially toxic
and inflammable.
This test shall be performed at an air temperature of 20 °C to 25 °C and relative air humidity of 50 % to 70 %.
The test is to determine any adverse effects on the material by checking whether it absorbs liquid or
whether there is any visible effect (e.g. deformity), change in physical properties (e.g. flexibility) or mass
change due to any action of the test liquids on the material.
This test applies to components that come into direct contact with the plant protection product. The
samples to be tested shall be complete components (e.g. a whole ‘O’ ring, a washer, a gasket, a tube), or
samples of material of larger components such as the spray tank.
The mass m of each sample of material shall be recorded before the test.
b
The samples shall be tested by immersion in:
a) a 10 % acetone (EC-No: 200-662-2) in distilled water for 72 h; and then
b) a mixture of 50 % regular unleaded gasoline and 50 % diesel for 72 h.
After the immersion period, any surplus liquid shall be wiped from the external surface and the samples
dried in air for 24 h. Then, the mass m shall be recorded for each sample.
a
Calculate the mass change Δm in percentage using the following equation for each test liquid:
mm−
ab
Δm= ×100%
m
b
where
m is the mass before the test;
b
m is the mass afte
...
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