In the automotive industry, they use the SAE J standard to evaluate weathering of exterior plastic materials by accelerated means. Most engineers involved. 22 Apr SAE J SAE J is the performance standard based on the test parameters of SAE J Use of xenon arc test apparatus to perform. SAE J is a guide for comparing the performance of test equipment. SAE J and J gave automotive manufacturers the opportunity to standardize .

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About the Author Melissa Bajorek began writing professionally in While this sometimes results in faster same-type degradation hence the yr Miami “equivalent” it can both cause failures not seen in outdoor exposures as well as cause different kinds of changes some actually less severe! There are two primary types of xenon-arc instruments: Automotive OEM’s require this. The automotive industry uses the SAE J standard to evaluate how exterior plastics on automobiles weather.

SAE J sets the standards for test duration, which is length of exposure to the xenon-arc device, and states protocol for the proper preparation of material samples prior to testing. In the automotive industry, they use the SAE J standard to evaluate weathering of exterior plastic materials by accelerated means. This device is used to mimic UV radiation and outdoor conditions, to weather samples of auto exterior or interior plastics or fabrics.

SAE J How does it correlate to Florida exposure

Any new xenon-arc test equipment must be verified by a contracted third party. Xenon-arc equipment cannot exactly mimic the effects of true sunlight because absorption of UV radiation is absolutely wavelength-dependent. Her work has sas online, in daily newspapers and on websites owned by Gatehouse Media, in monthly periodicals and for local and regional radio. Know that SAE J standards were developed in the s and are still used for preliminary tests; but be aware that auto manufacturers conduct real outdoor testing to validate lab results and to develop new auto-exterior materials.

Has there been any activity focused on changing the light source and filters to more accurately predict real life exposure?

Test equipment must also pass a verification process before it can be used in the lab. While you might think that this would just result in a shorter test time, it has frequently been shown that the SAE J test as written has the potential to change the photochemiisty of degradation.


First, it is important to understand that the spectral power distribution light intensity vs. Still, it’s a conundrum when considering accelerated tests like Xenon Arc or even oven aging, to test under more severe requirements to predict performance over very j19600 periods of time i.

She writes about a variety of topics, from new technology to animal husbandry. Xenon and Carbon Arc Weathering Standards. These tests assume the time-temperature superposition principle without taking into account thermooxidative effects at higher temperatures, or the deleterious effects of shorter wavelength light and thus higher energy.

How to Understand SAE J | It Still Runs

Either way, it can be a non-predictive test for some materials. Some polymers undergo heat degradation that cause yellowing or darkening not at all due to UV. We see the same thing in tests like UL for wire and cable. You make a good point about the light source though. Materials degrade or exhibit changes like fading, loss of luster, i1960 in ase strength or corrosion because molecular bonds have been broken and chemical reactions have occurred within the material.

To understand SAE J, you should know sxe issuing committee and the purpose of the tests, as well as some details about what it covers and its potential inaccuracies. Unlike the small amount of exterior material sample tested with SAE J, even small impurities can alter the effects of UV radiation on the auto as a whole.

SAE J1960: How does it correlate to Florida exposure

It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. To understand SAE J standards, you should know about the equipment used to complete the tests. In short, the exterior of each finished automobile is unique, and is subject to unique weather conditions, meaning that SAE J is an effective guide, but not always an accurate method of testing.

Melissa Bajorek began writing professionally in When this test temperature is lowered to 63C, the effect of discoloration is much less pronounced and we can focus mostly on the UV effects.

Ci Xenon Weather-Ometer Finishing. Another issue with SAE J standards is that real auto-exterior materials are produced in a factory, where impurities and contaminants do exist. SAE J tests are performed in laboratories by auto manufacturers and parts suppliers.


Bajorek has an Associate of Arts in business management from the University of Phoenix and holds certifications in marketing and advertising. These changes can be caused by forces other than sunlight. To understand SAE J standards, you must be aware of its inaccuracies, as the standards do not exactly represent real world weathering of materials. In other words, only certain approved tools can be used to perform the tests.

While the automotive OEM’s and suppliers use J as-written or modified for preliminary material approval, they still conduct outdoor testing to validate the interim results and develop models for materials that “correlate” the lab exposure to real outdoor weathering.

So when comparing J to outdoors, you’re comparing apples to oranges and they don’t equate. According to Weiss Gallenkamp, manufacturer of xenon-arc devices, the type of cooling used in the device has a negligible effect on the light output, but does affect overall design. All information presented is for general reference dae does not represent a professional opinion nor the policy of an author’s employer.

Photo Credits red car image by Tammy Mobley from Fotolia. One other factor is that this type of comparison, based on a single factor solar radiant energy does not take into account the other weathering factors of heat, moisture, etc. Also, the wavelengths of UV radiation from sunlight varies at different times of the day and throughout the year.

Since Planck’s law says that photon energy j19600 inversely proportional to wavelength, this low wavelength UV has sufficient energy to cause much more damage to organic materials than sunlight.

The SAE J test does include heat ageing 83C and water spray cycles so it should account for some of these other effects you mention.

We use SAE J heavily for automotive and non-automotive weathering as a defacto test to predict long term performance. SAE J sets the protocol for the operating procedures of a controlled irradiance, xenon-arc apparatus. To understand SAE J, note that in some regions automobile exteriors will weather differently due to outdoor conditions.