baths may also be ud.
5.3For exposure to distilled or deionized water in the laboratory it may be convenient to u the apparatus shown in Fig.1.
5.4For exposure to constant relative humidities,the speci-men may be placed in a apparatus similar to that shown in Fig.
1.A saturated salt solution may be placed in the bottom of the glass tube to provide a constant relative humidity(e Practice E104);a stopper having a small glass tube packed with grea may be ud to al the upper end of the large glass tube. 6.Test Specimens
6.1The successful u of the following test method depends on preparing good quality T-peel joint specimens.Prepare the test panels carefully according to the adhesive manufacturer’s directions or acc一字十三点猜一字
ording to some other specified t of condi-tions agreed upon between the manufacturer and the purchar.
花旦纹身6.2U the test-panel construction and the test specimen described in Test Method D1876.To adapt to differing test conditions and constraints due to size or configuration of various test environments and apparatus,dimensions of the specimen may be varied as long as they are identical when making direct comparisons of different adhesives.
N OTE1—For example,test specimens may be cut to12.7mm(1in.) wide tofit more readily into a glass tube as shown in Fig.1.
6.3The adherend surfaces may be either etched(e Guide D2651),solvent wiped,degread,or treated by some
other FIG.1Apparatus for Measuring Adhesive Peel Rates in
Water
specified method of surface preparation.
7.Conditioning
7.1Condition the peel specimens while either stresd or
unstresd in the environment of the specific test for a
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minimum of one day before beginning measurements.Carry
this out by discounting measurements made during the first
day.
8.Procedure
8.1Clamp one end of the nonbonded part of the T-peel test
specimen as shown in Fig.1and attach to a stationary frame or
object relatively free of vibrations.Clamp the other end of the
panel and attach the desired weight (if the apparatus shown in
Fig.1is ud,the total force on the adhesive joint is equal to
the sum of the weights of the water,the wet-peel apparatus,and
the applied weight.To avoid possible breaking of the glass tube
when a joint fails it is uful to attach a light-weight string from
the ho clamp or wire around the upper part of the glass tube
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怎么去胡子to the fixed point of support.If this apparatus is not ud,the
peel joints may be tested in ries by bolting veral joints
together and attaching the weight at the bottom).The force
exerted on the adhesive joint being tested should be a multiple
of 450g (1.0lb).Expo the stresd specimen to one of the
standard test environments,and then measure the length of the
unpeeled portion of the specimen.Record this length hourly,
daily,or weekly depending on the rate of peel of the specimen
until the specimen has peeled to failure.Make at least six
一本万利measurements for each specimen.Test a minimum of three
specimens under each t of conditions (test environment and
stress).Suggested stress levels are 25,50,and 75%of the
normal T-peel strength as measured by Test Method D 1876.
9.Calculation
9.1Plot the distance peeled (distance peeled equals initial
length of unpeeled portion minus length of unpeeled portion at
宴客菜谱time t )versus time.The slope of the curve at any point is the
peel rate at the corresponding time t .Divide the curve into six
equal parts.If the peel rate varies less than a factor of two over
all six parts of the curve,then obtain an average peel rate (slope
of the curve)for the specimen.In order to asss durability,
compare the peel rates under different levels of stress and
activities of water (for example,three stress each for test
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environments 1and 3)by plotting the log of peel rate versus
stress.10.Report 10.1Report the following information:10.1.1Complete identification of the adhesive tested,in-cluding type,form,source,and manufacturer’s code number.10.1.2Complete identification of the adherends ud,in-cluding composition,thickness,and the temper for metals.N OTE 2—The two adherends need not be identical;for example,a thin adherend may be bonded to a thick adherend with peeling occurring at 180°.10.1.3Method of preparing the test panel (both adhesive and adherends)and conditioning treatment.10.1.4Method of testing (weight in grams per millimetre (pounds per inch);test environment number from Table 1,including a complete description of any special test environ-ments;location of outdoor test site and time of year,high,low,average temperatures,and sun exposure;angle of peel).10.1.5Number of specimens tested,average bond line thickness,initial peel strength of specimens from the same test panel,average peel rate (or curves of distance peeled versus time)for each specimen,and plot of log of peel rate versus stress when available.11.Keywords 11.1adhesive;durability;exposure;joint;moisture;stresd;T-peel The American Society for Testing and Materials takes no position respecting the validity of any patent rights asrted in connection with any item mentioned in this standard.Urs of this standard are expressly
advid that determination of the validity of any such patent rights,and the risk of infringement of such rights,are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revid,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standards and should be addresd to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsible technical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards,100Barr Harbor Drive,West Conshohocken,PA 19428.TABLE 1Standard Test Environments Test Environment Number Temperature A Moisture Conditions B 123°C (73.4°F)immerd in distilled or deionized water 223°C (73.4°F)50%RH (relative humidity)323°C (73.4°F)15%RH 435°C (95°F)90%RH 535°C (95°F)100%RH 650°C (122°F)90%RH 750°C (122°F)100%RH 835°C (95°F)5%salt fog 9ambient (outdoors)ambient (outdoors)10other (specify)other,including aqueous solutions or nonaqueous liquids (specify)A The tolerance for test temperature shall be 61°C (1.8°F)for environments 1to 8.B
The moisture condition may be provided by controlling the relative humidity of
a box,room,or other chamber by any convenient
means.
