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what is polymer composite for
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Epoxy not curing can result from improper mixing ratio, low temperature, or poor quality resin/hardener. First, check if the mixing ratio was accurate; incorrect ratios prevent proper setting. If the ratio was correct, temperature might be the issue; most epoxies require a minimum of 70°F to cure properly. Use a heat gun or space heater to gently warm the area without overheating. If ambient temperature isn’t the problem, the quality or expiration date of the epoxy could be at fault. Try a small test batch with fresh epoxy. If none of these steps work, removal and reapplication with a new batch may be necessary. Ensure all surfaces are clean and dry before reapplying.
The amino acid with the lowest isoelectric point (pI) is aspartic acid. The isoelectric point is the pH at which a molecule carries no net electric charge. Aspartic acid, an acidic amino acid, has a pI around 2.77. This low pI is due to its side chain, which contains a carboxylic acid group, readily donating protons in aqueous solutions, thus acting more acidically. The presence of this additional acidic group means aspartic acid gets deprotonated at lower pH values compared to other amino acids, leading to its notably low pI. Understanding pI values is crucial in biochemistry and molecular biology, especially for protein purification and enzyme activity studies, as it influences solubility and overall molecular interaction.
Rutile titanium dioxide is a mineral that has a wide variety of uses, mainly as a pigment. Here are a few factories that produce this material:
1. The Chemours Company (USA): It produces titanium dioxide under the brand name Ti-Pure.
2. Tronox Holdings plc (USA): Tronox is a global leader in producing and marketing titanium dioxide.
3. Venator Materials PLC (UK): Based in UK, Venator is a manufacturer and marketer of various chemical products, including titanium dioxide.
4. Kronos Worldwide Inc (USA): Provides rutile titanium dioxide pigments under brand name KRONOS.
5. RKW SE (Germany): The company offers RKW Group rutile titanium dioxide.
6. Lomon Billions Group (China): This is the world's third-largest titanium dioxide manufacturer, offering rutile and anatase products.
7. Ishihara Sangyo Kaisha Ltd (Japan): This is another leading manufacturer of titanium dioxide, primarily for the Japanese market.
8. Grupa Azoty (Poland): This is a leading Polish company that manufactures a variety of chemical and fertilizer products, including titanium dioxide.
9. Cristal (Saudi Arabia): It operates eight manufacturing plants in seven different countries worldwide providing titanium dioxide pigments. In 2019, Cristal was acquired by Tronox Holdings plc.
10. DONG JYU Chemical Co., Ltd (South Korea): Provides both rutile and anatase type titanium dioxide pigment.
Please note that availability of products may vary based on location and company's policy. Always contact the company directly for detailed and accurate information.
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