To load ink into a Canon MX490, first, ensure the printer is turned on so the ink cartridge holder moves to the appropriate position. Open the front cover along with the paper output cover. You will see the ink cartridge holder. A key part of the process is to be gentle and to avoid touching the electrical contacts or ink nozzles on the cartridge, as this can affect the printing quality. If replacing, remove the old cartridge by pushing down on it and then take it out of the holder. For a new cartridge, remove the protective covering and gently insert the cartridge into the holder with the correct color slot, ensuring it clicks into place. Close the covers, and the printer should recognize the new ink, prompting you with a message on the display. Follow any on-screen instructions to align the cartridges if needed. This simple maintenance task ensures your Canon MX490 continues to provide high-quality prints.

I'm sorry for any confusion, but it seems there might be a mistake or typo in your question, particularly with the term "ocains." Polypropylene is a common thermoplastic polymer used widely in packaging, textiles, automotive parts, and many other applications due to its versatility, chemical resistance, and durability. Without specific context or clarification on what "ocains" refers to, it's difficult to provide a precise answer regarding the amount of polypropylene involved. Polypropylene usage varies significantly across industries and specific products, so understanding the context or specific application in question would be necessary to give an accurate estimation or explanation of polypropylene content. If "ocains" relates to a specific product, industry term, or is a term requiring clarification, please provide more details for an accurate and useful response.

A high-performance polymer, often referred to as a "hi-polymer," is an advanced material designed for applications requiring exceptional mechanical, thermal, or chemical properties. These polymers include materials like polyether ether ketone (PEEK), polysulfone (PSU), and polyimide (PI). Hi-polymers are distinguished by their ability to maintain performance under extreme conditions, such as high temperatures, corrosive chemicals, and heavy mechanical loads. They find widespread use in industries like aerospace, automotive, electronics, and medical devices due to their durability, light weight, and resistance to wear and tear. For instance, PEEK is commonly used in aerospace components because of its ability to withstand high temperatures and resist deformation under pressure. The development of hi-polymers has significantly contributed to advancements in various fields, enabling lighter and more efficient products that can operate in challenging environments.