ASTM D Standard Test Methods for Pressure-Sensitive Adhesive- Coated Tapes Used for_化学_自然科学_专业资料。ASTM D ASTM D – Standard Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applications. ASTM D – Standard Test Methods for Pressure-Sensitive Adhesive- Coated Tapes Used for Electrical and Electronic Applications. This standard is a part.
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When thermosetting tapes are used, cure the assembly as described in Except for determination of length of tape in a roll, remove and discard a minimum of three layers before removing tape for preparation of test specimens. Pass the adhesion roller prescribed in Insulation Resistance at High Humidity.
After this application of pressure, cut the tape to a width of 13 mm 1? It is limited in that adhesion to itself or backing only are considered, while in use tapes are generally adhered to various surfaces.
Protect the adhesive surface from dust. By dd1000 means, attach this assembly to a scale or other measuring device. Run off approximately mm 1 ft of tape for each determination. The adhesion property is also important in determining the uniformity of quality. Wrap the tape so as to leave s1000 gap between turns of 1 to 1.
Test Specimen Preparation 5. Calibrate the gauge for the actual load exerted by the presser foot. Avoid juggling or touching the tape to direct it during the wind up.
Firmly clamp the tape between the electrodes taking great care to avoid contact between the hands and any tape surfaces between electrodes. Conditioning for Low Temperature Measurements 9. After 25 mm 1 in.
ASTM D Standard Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for_图文_百度文库
One arrangement, suitable for testing a number of tapes at the same time, has several rows ashm electrodes mounted on the inside of the cover of the humidity chamber as shown in Fig. Measure the width perpendicular to the edges in mm in.
Calculate and record all values, and the median resistance of the? Unwind Force at Low Temperatures.
A satisfactory method of attaching guarded electrodes to the cover and bringing out a satm for each electrode is shown in Fig. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
A motorized system must be used to unwind the tape, as demonstrated in the video. The amount of each is a predicator of the difficulty one might experience in handling strips of any length of unwound tape during their application. Zero the sensor and manually pull the leading edge of the tape and?
Yards per roll 5 weight of roll less core 3 length of specimen, in. After conditioning, measure the relaxed length of the specimen to the nearest 2 mm or 0.
Axtm you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
D — 10 wind-up roll that can be used to either manually or automatically unwind the roll of tape. Position the roll and length sensor so that the sensor is in contact with the circumference of the roll and the leading end of the roll is directly under the sensor.
Let it relax for about 2 min or more. Thoroughly instruct all operators in the proper way to conduct tests safely. When making high voltage tests, particularly in compressed gas or in oil, it is possible that the energy released at breakdown will be suff?
These backings are made from materials such as:. Use only full rolls of tape.
This is angle A. No further reproductions authorized. Two recommended procedures are 1 to slit the specimen with a sharp razor blade free of nicks while the specimen is held down with a pattern of the desired width, or 2 to slit with mounted parallel sharp razor blades free of nicks to the desired width.
Immediately test the specimen to prevent misleading results due to drying of the sample. Asm to Accelerated Aging Heat and Moisture. Compare with the prescribed time of failure. Method B—For Class 2 Tape Wider samples can be used, however pressure sensitive adhesives which are wider than 1 inch may have more variability in the unwind force.
It is the responsibility of the user of this standard to establish ashm safety and health practices and determine the applicability of regulatory limitations prior to use. These tapes are classified as follows: Remove the asym from the oven, and allow them to cool for 5 min. Vinyl chloride and co-polymers.
ASTM D – Testing equipment according to ASTM D | Rycobel
The comparison of dielectric breakdown voltage of different tapes after exposure to widely differing moisture conditions gives an indication of the quality of the compound used in the tape backing as a moisture resistant dielectric material.
If it is necessary to trim the specimens due to the machine or jaw width limitations, take extreme care since hand trimming has the potential to materially affect the test results. If a value for measurement is followed by a value in inch-pound or English units in parentheses, the second value may only be approximate and is for information only.
Lower the presser asstm onto the tape gradually to minimize any impact force, allowing it to rest upon the tape for 2 s, and then observe the reading to the nearest 0. To apply pressure to the specimen, use a roller weighing 6 50 g 4. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Place the tape on a smooth clean surface, adhesive side up, or suspend it from one end in free air. After adtm, remove specimens from the oven and allow to cool to room temperature.
Follow the procedure described in