This standard is issued under the fixed designation D ; the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. ASTM D Testing Water Resistance in % RH. Can be used to test the water resistance of coatings by exposing coated specimens to a high relative. ACCELERATED LIFE TESTING. Touchstone performs corrosion testing and accelerated life testing of virtually any material or device. Among the tests offered .
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As the warmer atsm air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Other tests may also deposit water droplets on the surface but where the source is not from condensation. Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
A number in parentheses indicates the year of last reapproval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Other tests are used to monitor degree of failure as a function of exposure time. This practice differs from other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area.
v2247 Individual reprints single or multiple copies of this standard may be obtained asrm contacting ASTM at the above address or at phonefaxor service astm. The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Link to Active This link will always route to the current Active version of the standard.
Note 1—Alternative practices d22477 testing the water resistance of coatings include Practices DDand D Originally approved in dd2247 This practice is therefore useful for evaluating coatings alone or complete coating systems. 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.
Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Such control specimens can provide warning of changes in test severity in a given apparatus, and can indicate variations in test severity between different apparatuses. Specimens used for chamber veri?
Active view current version of standard Translated Standard: Other tests are used to monitor degree of failure as a function of exposure time. Four typical designs are shown in Fig.
NOTE 3—Due to heat loss to the specimens and the walls of the chamber where a heated water tank is used, the temperature atm the water in the tank will be above the temperature of the air and water vapor mixture. This makes this practice suitable for flat panels as well as large or 3D objects. The values given in parentheses are for information only. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. This practice is therefore useful for evaluating coatings alone or complete coating systems. Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance. Active view current version of standard. Material used for supports shall be of sufficient stiffness so that they do not distort or sag during prolonged use.
This practice differs from other methods ashm condensation is only formed on the front coating surface, but the back surface is outside the exposure area. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee sstm Standards, at the address shown below. The values given in parentheses are for information only. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.
Primary limit control for immersion heater 6 5—Heated water tank for supplying heat and humidity to room 6—Immersion heater 7—Water v2247 limit control 8—Constant level water tank unheated with over?
Three types of apparatus have been found to meet the d2247 of this practice. Before using the exposure device to this standard for the? Primary limit control d22447 immersion heater 5 8—Water line 9—Insulation if necessary see X1.
Practices D cover application techniques for the production d247 uniform? If condensation is not observed on any specimen immediately after the chamber is opened, discontinue the test and determine the cause of the lack of condensation before continuing. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.
This makes this practice suitable for? Specimens must be placed at a level above the water in the heating jacket to insure proper condensation. Current edition approved Dec. Slotted nonmetallic supports are suitable for? Alternative practices for testing the water resistance of coatings include Practices DDand Astn