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what are epoxies
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The primary difference between inside (interior) and outside (exterior) PVC lies in their formulation to withstand various environmental conditions. Interior PVC is designed for indoor applications, focusing on aesthetics and resistance to household chemicals and abrasions. In contrast, exterior PVC products are formulated to endure harsh outdoor conditions such as UV exposure, fluctuating temperatures, moisture, and potentially aggressive environmental pollutants. This results in exterior PVC often being treated with UV stabilizers and impact modifiers, making it more durable and longer-lasting under direct sunlight and weather variations. While both types share the inherent qualities of PVC, such as versatility and chemical resistance, the specific enhancements for exterior use are crucial for ensuring longevity and performance in outdoor applications.
Iron oxide (Fe2O3) is a chemical compound composed of two iron (Fe) atoms and three oxygen (O) atoms, forming a molecule with the formula Fe2O3. This composition results from the valency of iron (Fe) which can vary, but in iron(III) oxide, iron has a valency of +3. The oxygen has a valency of -2. To balance the charges and achieve stability, two iron atoms each providing +3 charge (total of +6) combine with three oxygen atoms each providing -2 charge (total of -6), resulting in a neutrally charged compound. It's a common form of iron oxide and can be found in nature as the mineral hematite. It is widely used in various industrial applications, including steel manufacturing and as a pigment.
Natural polymers are large molecules composed of smaller building blocks called monomers, which are primarily sourced from plants and animals. These polymers are critical in nature for various biological functions and structural applications. Examples include cellulose, which is made from glucose units and is essential for the structure of plant cell walls; proteins, made from amino acid monomers, which serve as the building blocks of muscles, enzymes, and many hormones; and nucleic acids like DNA and RNA, composed of nucleotide monomers, which carry genetic information. Other significant natural polymers are starches, also based on glucose monomers, used by plants for energy storage, and natural rubber, comprised of isoprene units, valued for its elasticity. These substances are renewable and biodegradable, making them highly valued for sustainable materials and applications.
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