Polycarbonate

BPA returned in the 1950s as polycarbonate and epoxy resin (most commonly found in plastic bottles and the inside lining of cans) after its properties were studied in 1930. A carcinogenesis study was done after a rise in popularity of BPA containing products emerged. In the late 1970s, the National Cancer Institute (NCI) and National Toxicology Program (NTP) tested the safety of BPA. Evidence of carcinogenicity effects found in the report was not concrete. However, the NTP reported reproductive toxicity. In 1997 and 1998, Fred vom Saal and his research team published two studies, based on research done on the effects of low-dose (below 50 micrograms/kilogram) BPA on mice. They found changes in male reproductive organs, as well as, increased prostate weights. Vom Saal’s findings…

Bisphenol A is widely used in plastics to form different types of materials for daily use in society. However these plastics such as containers, may expose people to small amounts of BPA in food and water. The exposure of BPA comes primarily from consumption of food, as there was a national survey given out by the CDC(Centers for Disease Control and Prevention) as there was BPA found in urine more than 90% of the people being studied. In one of the research articles, a team of scientist…

Chapter One Introduction Do you ever wonder what happens to water that has been exposed to heat? Usually, when running errands, we forget about our refreshments and leave them sitting in our car. This exposure to solar energy heats up the polycarbonate plastic bottle and initiates the release of Bisphenol A, or BPA. Although it is not emitted in large quantities, the progressive consumption of BPA can have negative effects on the brain, behavior, and prostate glands in fetuses, infants, and…

The purpose of my experiment is to examine the amount of BPA levels in food packaging for infants. I believe that the BPA levels in baby food varies considering food packaging size, texture, material, and color. To help me during my experimental process I have found several articles,that explain each concept of my experiment; also providing background information. Kubwabo, C., Kosarac, I., Stewart, B., Gauthier, B. R., Lalonde, K., & Lalonde, P. J. (2009). Migration of bisphenol A from plastic…

A new form of polycarbonate plastic has been synthesized for the creation of collegiate helmets. The plastic was developed in order to combat the traumatic impacts created in collegiate sports, in focus on velocity and head rotation. It was hypothesized that the new form of polycarbonate plastic would reduce the risk of concussion severity in traumatic impact by 8%. Concussions in collegiate sports are of significant importance due to the domino-effect of the injuries. Repeated concussions are…

indoor courts require sports goggles for indoor lighting and impact resistance from flying objects. Other sports like cycling are performed in changing environmental conditions and impact is often from road debris. Yet, sports like basketball, it's those jabs and pokes from fingers in a contact sport that can cause the eye injuries. Lenses for sports glasses and goggles come in a variety of materials. Here are some of the most common and the pros and cons of each: * Plastic - Plastic lenses,…

impact tester. Materials and Methods Apparatus: Three specimens with a machined 45° notch (V-Notch) at room temperature {Polycarbonate, Polyamide (Nylon 12) and High Impact Polystyrene (HIPS)}. Avery Denison 6709 IZOD impact tester, used to measure the energy required to cause the specimens to fracture. Figure1. Vernier calliper used to measure the dimension of the specimens, as…

Item H form Mrs. Atkins is provided form the website bisphenol-a.org. the article was written in July 2007. The article “Bisphenol A fact sheet,” originates from the Polycarbonate/BPA Global Group. Bisphenol A is a chemical block used to make polycarbonate plastics and epoxy resins. Most of BPA that is being consumed at manufacturing sites, produce low levels of bisphenol A to the environment. BPA factors are stated as a non-risk to the environment because, of the low amount of BPA is released…

1. Rack and wall mountable connector housings shall accept an interchangeable connector panel. An adapter panel is defined as a modular removable plate containing optical fiber connector adapters. 2. Fiber optic adapter panels shall meet all requirements in this specification B. Design Specifications: Corning Cable Systems LANscape CCH Adapter Panels and Pigtailed Panels C. Physical Specifications 1. The adapter panel shall utilize a single mounting footprint and shall be interchangeable…

plants. Nevertheless, a 2009 meta-analysis of BPA in the surface water system showed BPA present in surface water and sediment in the US and Europe. According to Environment Canada in 2011, "BPA can currently be found in municipal wastewater. [...]initial assessment shows that at low levels, bisphenol A can harm fish and organisms over time. BPA affects growth, reproduction, and development in aquatic organisms. Among freshwater organisms, fish appear to be the most sensitive species. (A B…