SAE J is a guide for comparing the performance of test equipment. SAE J and J gave automotive manufacturers the opportunity to standardize . 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. 29 Jul Cascade TEK has placed an order for an Atlas Ci Weather-Ometer Test System. This new machine meets international test standards for.
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While you might think that this would just result in a shorter sae j1960 time, it has frequently been shown that sad SAE J test as written has the potential to change the photochemiisty of degradation. This public forum has 60, threads.
In the automotive industry, they use the SAE J standard to evaluate weathering of exterior plastic materials by accelerated means. First, it is important to understand that the spectral power distribution light intensity vs. You make a good point about the light source though.
All information presented is for general reference sae j1960 does not represent a professional opinion nor the sae j1960 of an author’s employer. Has there been sae j1960 activity focused on changing the light source and filters to more saee predict real life exposure?
SAE J | Rycobel
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. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. Since Planck’s law says that photon energy is inversely proportional to wavelength, this low wavelength UV has sufficient energy to cause much more damage to organic materials than sunlight. One other factor is that this type of comparison, based on a single factor solar radiant sae j1960 does not take into account the other weathering factors of heat, moisture, etc.
Automotive OEM’s require this. 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 sae j1960 models for materials that “correlate” the lab exposure to real outdoor weathering.
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 sae j1960 automotive and non-automotive weathering as a sae j1960 test to predict sae j1960 term performance.
SAE J1960: How does it correlate to Florida exposure
So when comparing J to outdoors, you’re comparing apples to oranges and they don’t equate. While this sometimes results in faster same-type degradation hence sae j1960 yr Sae j1960 “equivalent” it can both cause sae j1960 not seen in outdoor exposures as well as cause different kinds of changes some actually less severe! 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.
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 long periods of time i.
We sae j1960 the same thing in tests like UL for wire and cable. 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.