ASTM D1735 Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus

The ASTM D1735 standard practice outlines the procedure for testing the water resistance of coatings using the water fog apparatus. This widely recognized standard provides valuable insights into the durability and performance of coatings, ensuring their suitability for a wide range of applications. ASTM D1735 is a comprehensive standard developed by the American Society for Testing and Materials (ASTM) that evaluates the water resistance of coatings. By subjecting coated materials to a specified fogging environment, this test simulates realistic conditions to assess their performance and durability against moisture.

The ASTM D1735 standard, along with related practices such as the ASTM B117 salt spray test, plays a vital role in determining the water resistance and corrosion performance of coatings. By complying with these standards and utilizing corrosion testing methods, manufacturers can produce coatings that provide reliable protection against water damage and corrosion. Salt spray chambers offer a controlled environment to accurately simulate harsh conditions, enabling manufacturers to evaluate and enhance their coating’s durability.

ASTM D1735 Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
Type and Description WEW-YW-60D WEW-YW-90D WEW-YW-110D WEW-YW-120D WEW-YW-130D WEW-YW-160D WEW-YW-200D
Inner Dimension(mm) 600*450*400 900*600*500 1000*750*500 1200*800*500 1300*850*600 1600*1000*600 2000*1000*600
Outer Dimension(mm) 1070*600*1180 1410*880*1280 1600*1050*1200 1700*1150*1200 1800*1200*1300 2300*1250*1450 2800*1350*1450
Test Room Size (Liters) 108 Liters 270 Liters 420 Liters 500 Liters 650 Liters 1000 Liters 1200 Liters
Power Supply AC 220V, 50Hz AC 220V, 50Hz AC 220V, 50Hz AC 220V, 50Hz AC 220V, 50Hz AC 380V, 50Hz AC 380V, 50Hz
Power Current 1Phase, 1.5 kW 1Phase, 2.0 kW 1Phase, 2.5 kW 1Phase, 2.9 kW 1Phase, 3.5 kW 3Phase, 5.0 kW 3Phase, 6.5 kW
Lid Opening Method Manual Opening Manual Opening Manual Opening Manual Opening Pneumatic Air-Operated Pneumatic
Brine Tank Volume 15 Literes 25 Literes 30 Literes 30 Literes 35 Literes 40 Literes 45 Literes
Test Room Temp Range Ambient Temperature +5℃ – +30℃, Ventilation is recommended, if the temperature exceeds +30℃, it is recommended to adjust the room temperature by suitable means. Ambient humidity should be controlled below 80%RH.
Test Room Temp Range RT+10℃ – +55℃ RT+10℃ – +58℃ RT+10℃ – +55℃ RT+10℃ – +58℃ RT+10℃ – +55℃ RT+10℃ – +58℃ RT+10℃ – +55℃
Saturated Barrel  RT+10℃ – +70℃ (Purpose: Heating and filtering of compressed air to reduce nozzle crystallisation.)
Temp Performance Temperature Uniformity: ≤2℃ Temperature Fluctuation: ≤ ±0.5°C Temperature Uniformity: ≤2℃ Temperature Fluctuation: ≤ ±0.5°C Temperature Uniformity: ≤2℃ Temperature Fluctuation: ≤ ±0.5°C Temperature Uniformity: ≤2℃
Salt Mist Settling Rate 1~2 ml/80 cm2/h (Take 16 Hours To Test The Average Value) 1~2 ml/80 cm2/h 1~2 ml/80 cm2/h (Take 16 Hours To Test The Average Value)
Spray Method Continuous, Intermittent,  Programmable Tests Continuous, Intermittent,  Continuous, Intermittent,  Programmable Tests Continuous, Intermittent,  Continuous, Intermittent, 
Safety Devices Low Water Level Alarm Over-Temperature Alarm (Mechanical Over-Temperature Protection + Electronic Over-Temperature Protection Double Over-Temperature Protection) Low Air Pressure Alarm
Air Requirements Inlet Pressure Above 0.4Mp. Two-Stage Pressure Regulation. Spray Pressure 0.07~0.17mp (Adjustable) Inlet Pressure Above 0.4Mp. Two-Stage Pressure Regulation. Spray Pressure 0.07~0.17mp (Adjustable) Inlet Pressure Above 0.4Mp.
Sample Holder One Set Each Of V-Groove And O-Round Bar (Combined To Form An Angle Of 20°±5%). Special Samples Support Customisation. Load Capacity According To The Actual Situation
Standard Configuration 1 Set Of V-Type/O-Type Shelves, 2 Bottles Of Test Drug Sodium Chloride (500g/Bottle), 1 Plastic Anti-Rust Bucket (5l Capacity), 1 Nozzle
salt spray testing

ASTM corrosion testing standards, including ASTM D1735 and ASTM B117, play a crucial role in ensuring the reliability and quality of coatings. The ASTM B117 salt spray test is a widely used method to assess the corrosion resistance of coatings. It involves exposing test specimens to a saline fog environment within a controlled chamber. This test helps evaluate the coating’s ability to withstand salt spray and provides valuable insights into its resistance against corrosion. By testing coatings against corrosion, manufacturers can identify potential weaknesses and make necessary improvements to enhance the coating’s performance.

Corrosion is a natural process that can cause significant damage to coatings. Various testing methods, such as the salt spray test and other accelerated corrosion tests, help assess a coating’s resistance to corrosion. These methods replicate harsh environmental conditions, enabling manufacturers to evaluate the potential durability of their coatings effectively. Adhering to ASTM corrosion testing standards ensures that coatings meet stringent quality requirements, ultimately benefiting end-users in various industries.

5.1 Descriptions for the Test Chamber, Test Specimen Supports, and Fog Collecting Devices, are listed under Apparatus Section in Practice B117. 5. Apparatus
5.2 Unless otherwise specified, provide for continuous recording, such as a chart recorder or data logger, of the temperature within the chamber during the exposure period.
6.1 This practice does not cover the preparation of test specimens. The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. 6. Test Specimens
Note 2: Applicable methods for the preparation of test panels and substrates are given in Practices D609 and D1730. Practices D823 cover application techniques of the production of uniform films.
6.2 It’s recommended that a control specimen of a paint with known durability be included with each test. 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.
6.3 It’s recommended that at least two replicate specimens of each different coating be used, so as to compensate for variations between specimens and variations in test conditions within the apparatus.
salt spray fog apparatus
7.1 Fill the reservoir with reagent water conforming to Type IV or better of Specification D1193. 7. Procedure
7.2 Heat the water to the desired temperature with the circulating system in operation. If no temperature is specified, heat the water to 38 6 2°C (100 6 4°F). Maintain the temperature throughout the test.
7.3 Support or suspend specimens 15° from the vertical, with the plane of the specimen parallel to the direction of the fog flow. Slotted wood supports are suitable for flat specimens. Each specimen shall be placed to permit unencumbered exposure to the fog. A minimum spacing between specimens of 30 mm is recommended. Arrange the specimens so that the water from one specimen does not drip on other specimens.
7.4 To collect fog for measurement, place two collectors within the chamber near the test specimens. Use a glass or plastic funnel with a diameter of approximately 100 mm with the stem of the funnel extending into the collection container.
Locate one container within 10 cm of the fog nozzle and the other as far as possible from the nozzle. Place the collectors so that they collect only the fog from the nozzle. Collection rates are to be measured every 24 h except on weekends and holidays. Record the collection rate in mL/h. Refer to customer specification for acceptable collection rates.
7.4.1 Use at least four collectors for cabinets that have more than one fogging nozzle. Position a collector 10 cm from each nozzle. Place the other collectors at positions as far as possible from each nozzle.
7.4.2 It is recommended to map the collection rates within the exposure zone of the cabinet once a year. Place collectors throughout the exposure zone to evaluate variations within the cabinet. Areas that are out of compliance should be taped off and specimens not tested there. Refer to manufacturer’s recommendations to correct the problem.
Note 3: Collection rate mapping of a chamber throughout the exposure zone to ensure conformance to the collection rate requirements is recommended as a means of reducing test variability.
Note 4: Larger cabinets that have more than one fogging nozzle, may need more than two collectors to obtain adequate collection information. Refer to manufacturers’ recommendations and customers’ requirements for specific requirements.
7.5 To control for variability within the apparatus, reposition the specimens on a regular basis so that all specimens spend equivalent amounts of time in the various areas of the apparatus (front, back, left, right, and center).
7.6 Adjust the atomizing air supply so that 1.0 to 3.0 mL of water/h is collected in a collector with a diameter of 100 mm based on an average run of at least 16 h. Collection rates outside the 1 mL/hr to 3 mL/hr range must be agreed upon between the customer and the supplier before starting the test and the alternate collection rate used must be stated in the test report.
Note 5: The fog rate specified in Practice B117 is only 1.0 to 2.0 mL/h for a collector with a diameter of 100 mm.
7.7 Operate the test continuously with the test chamber closed unless otherwise specified. Short interruptions to inspect or remove specimens or to replenish the water supply are permitted. Minimize the time the chamber is open during the interruption. Keep chamber closed whenever possible to prevent specimens from drying out.
7.8 Conclude the test after a specified period oftime or after effects from exposure to water fog are observed.
7.9 Wipe the test specimens dry. Rate specimens for changes in color, blistering, etc. Evaluate specimens no less than 5 min and no more than 10 min after removal from test, as the effects from water exposure can change within a short time. Remove only as many specimens as can be rated within the specified time.
Note 6: The 0 to 10 scale described in the ASTM STP 500 3 is preferred for rating. Relevant procedures for evaluating water effects are described in Test Methods D610, D714, D1654, D2616, D3359, D3363, and D4541.
7.9.1 If possible, rate the specimens again after they have been removed from the test for a recovery period long enough that moisture absorbed within the specimens dries out and the specimens reach moisture equilibrium with room air. A recovery period of 12 from 24 h is generally sufficient. The post-recovery rating allows evaluation ofthe permanent effects of the exposure as distinct from the transient effects, and is especially important for evaluation of color and gloss.
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