Titanium dioxide is not considered to be toxic or poisonous when used properly. It is generally recognized as safe by the Food and Drug Administration and is used in many products including food, cosmetics, and sunscreens. However, there is some controversy surrounding its safety when inhaled in large amounts, such as in occupational settings, due to its possible links to respiratory issues but research is ongoing. Therefore, while it is not classified as poisonous, caution should be exercised when handling in large quantities.

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Polypropylene (PP) is a notoriously difficult material to bond due to its low surface energy. Traditional adhesives often fail to properly adhere to PP. However, there are specially formulated adhesives designed for plastics like polypropylene. Cyanoacrylate adhesives (super glue) can be effective for small repairs, but their bond can be brittle. For a stronger, more flexible bond, two-component epoxies specifically designed for polypropylene or plastic-specific adhesives containing MMA (methyl methacrylate) are recommended. Surface pretreatment with a plasma or corona treatment can significantly improve adhesion, but these methods are more complex and typically used in industrial applications. For DIY projects, using an adhesion promoter or primer designed for polypropylene before applying the adhesive can also enhance bond strength. Always follow the manufacturer’s instructions for the best results.