Dear Customer, 

The purpose of this memorandum is to address some general questions concerning the life span of our King StarBoard®, King ColorCore®, and King ColorBoard® products. The use of special polymers and additives in these products yield the very best combination of appearance, toughness, rigidity, chemical resistance, environmental stress crack performance, and overall longevity. 

One of the most common questions asked is, “How long will King StarBoard®, King ColorCore®, or King ColorBoard® last?” This inquiry probably should be broken down into two questions: (1) how long will the color hold up before fading and (2) how long will the polymer retain its physical properties? Unfortunately, due to the many variables that affect these outcomes, such as product color, thickness, application, or climate it is impossible to give definite answers. In the following paragraphs, we will explain why and what you should be able to expect from our products. 

In order to answer the first question as to how long the color will last before fading, it should first be understood that the color stability of a product is primarily dependent on the type, quality, and color of the pigment used (not the UV stabilizers used). The only impact the UV stabilizer has on the color stability of a product is that by protecting the base material from degradation it helps maintain color. That being said, King Plastic Corporation uses the finest color pigments available for applications of long term outdoor exposure. All of our standard colors use pigments that are FDA approved (heavy metal free) as are our UV stabilizers. Each color we offer will perform with a slight difference from each other in regard to color stability. It is impossible to determine exactly how long any given color will “last”, due to the many variables affecting each application use. 

We continually monitor the color stability of our products by testing samples at our plant utilizing a QUV weather accelerator. These accelerated weather tests are quite long in nature and the results are checked at three, six, nine and twelve month intervals. By performing these tests on an ongoing basis, we can determine how a new color is going to hold up when compared to other established colors. 

The second question, as to the length of time the polymer can retain its physical properties is the reason why UV stabilizer additives are used. The sole purpose of the UV stabilizer is to bond molecularly with the base polymer and prevent the polymers molecular chains from breaking down due to UV exposure. The type and amount of UV stabilizers used and the amount of UV exposure are the main variables that affect polymer life. As with our pigments, King Plastic Corporation uses only the finest UV stabilizers available. 

King Plastic Corporation also randomly sends samples of our products to independent labs for UV content analysis. This testing procedure is performed to ensure correct loadings of the UV additives. Without exception, every one of these tests has verified having the correct amount of UV stabilizer present. As stated before, due to the many variables beyond our control, it is impossible to give an exact life expectancy. Based on the information available from our suppliers and from our many years of experience in producing these products, we feel eight to ten years should be a conservative figure. 

We do not publish copies of the test results mentioned above, because they contain information about our products that are proprietary. Please be assured that we are using the finest products available to us and that King Plastic Corporation is committed to monitoring our products to ensure that you receive the finest quality material on the market. 

Bill Birkholz
QA Supervisor 

Rev. 2 (5/31/19)