Developed by CNH Global, a leading global designer, manufacturer, and distributor of agricultural and construction equipment primarily sold under the Case and New Holland brands, CNH MTM0113 Materials Test Methods - Weather Gauge Testing describes a procedure for evaluating accelerated weathering of paint on metal or plastic surfaces or integrally colored plastics. This method follows Cycle 7A of ASTM G155 Standard Practice for Operating a Xenon Arc Lamp Device for Exposure of Materials.
This test method may involve hazardous materials, devices, and procedures. This test method is not intended to address all safety issues associated with its use or application. It is the user's responsibility to consult appropriate, established safety or health practices and to determine the applicability of regulatory limitations before use.
Test samples must meet the requirements of CNH MAT0103, CNH MAT0105, or CNH MAT3004 standards. At least two test samples must be subjected to this method for evaluation unless otherwise specified. The weatherometer must comply with ASTM G155 using daylight filters. Instruments used for color and gloss measurements must comply with ASTM E308 and ASTM D523 standards.
When performing tests, the test area should be a smooth, continuous surface free of evidence of poor film formation, sagging, solvent bursts, pinholes, or other defects, and all readings should be taken on approximately the same area of the test sample. All dirt, contamination, wax, or other residue should be removed before testing by gently wiping the surface with a dry cloth or a cloth dampened with a warm soapy solution that will not damage the paint material. The surface of the test sample should be visually inspected to identify any scratch marks, blemishes, or other surface defects. This should be noted before exposure to the test conditions. Initial color and gloss readings should be measured and recorded.
Cycle times are the same as those for ASTM G155: Cycle 7A, but backspray is not required. Backspray is acceptable if the test equipment is so equipped. Humidity and temperatures in ASTM G155 are target values and tight tolerances, which are not required during the spray cycle.
Samples are run in the weather meter for 300 hours. The test cycle is stopped only at the end of the light cycle to prevent possible water stains. No washing or other polishing of the test samples is permitted. Color and gloss values are measured and recorded.
The above steps are repeated to achieve a total exposure of 1200 hours. Colour and brightness readings should be taken and recorded at hours 300, 600, 900 and 1200 of the test cycle.
The CNH MTM0113 standard, which provides a weathering (irradiation) test method for evaluating the resistance of painted and coated parts to UV and light exposure, is designed to evaluate how coatings (e.g., paint, primers) resist UV light and weathering over time. This standard estimates outdoor performance by simulating exposure to prolonged sunlight and environmental stressors such as heat, humidity, and light. It is typically part of a series of environmental and physical tests in CNH's paint and coating evaluations.
This standard is incorporated into CNH's material specifications for metal parts, along with other tests such as adhesion, corrosion resistance, and flexibility. The results influence which performance class a coating system meets (e.g., Classes 1–6) and where and how it can be used in field applications.
This standard is considered important for the following reasons:
Weatherometer testing is a standard laboratory test used to simulate the effects of natural weathering, such as sunlight, rain, and moisture, on coatings, paints, and other materials over time. It is widely used to evaluate the durability and UV resistance of surface treatments in industries such as automotive, construction, and agriculture.
A weatherometer (or abrasion chamber) subjects test specimens to accelerated abrasion conditions, including:
The main parameters tested in these tests are:
This method can simulate hundreds to thousands of hours of outdoor exposure over months or years. Common durations are 500, 1000, or 2000 hours, depending on product application and industry.
Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the "CNH MTM0113 Material Testing Methods - Air Meter Testing" standard.
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