Polypropylene, a thermoplastic polymer widely used in various applications, is not typically characterized as brittle. Its molecular structure affords it a good balance of properties such as toughness, flexibility, and resistance to fatigue, making it less prone to cracking compared to more brittle materials like polystyrene. Polypropylene's resistance to brittleness is enhanced at room temperature, but it can become more brittle at very low temperatures. The addition of specific additives or copolymerization can further modify its properties to increase its resistance to impact, thus reducing its brittleness under certain conditions. Therefore, while not inherently brittle, the material's brittleness can be influenced by environmental conditions and material modifications.

Yes, you can glue ABS (Acrylonitrile Butadiene Styrene) and PVC (PolyVinyl Chloride) together, but it requires the right technique and adhesive. Regular cement used for PVC or ABS alone will not suffice due to their different chemical compositions. A special adhesive, known as a multi-purpose cement or a transition cement, is designed specifically for bonding ABS to PVC. It’s crucial to ensure that the surfaces are clean and dry before applying the glue. Applying the adhesive evenly and allowing adequate curing time according to the manufacturer’s instructions is also important. This method is mostly suitable for non-pressure applications since the bond might not withstand high pressure.

Titanium dioxide. a colorless and odorless natural mineral. is commonly used as a pigment in diapers to achieve a clear white appearance. While generally deemed safe for use in consumer products. certain advocacy groups worry that excessive inhalation of titanium dioxide in industrial settings could lead to respiratory issues. Ongoing research is being conducted on the potential effects of skin contact with this compound. such as through diaper use. As a precautionary measure. some parents opt for diapers without titanium dioxide.