Embroidering on polypropylene fabric can be a bit challenging due to its slippery nature and low melting point. Begin by choosing a sharp, thin needle to prevent snagging, such as a size 75/11 embroidery needle. Use polyester thread since it's strong and has a similar stretch to polypropylene, reducing the chances of stitches breaking. Stabilizing the fabric is crucial; a medium-weight cutaway stabilizer works best, adhered with temporary spray adhesive to prevent shifting. Opt for a lighter density in your embroidery designs to avoid puncture damage. Also, adjust the machine's tension settings if possible, to accommodate the fabric's unique characteristics. Lastly, test your settings on a scrap piece of polypropylene before starting your main project to ensure quality results.

Low Density Polyethylene (LDPE) is flammable and will burn when exposed to high temperatures or open flames. Being a hydrocarbon-based polymer, LDPE combusts, producing a yellow flame accompanied by dripping. The material ignites at around 340-349°C (644-660°F). However, like many plastics, it requires a significant heat source to maintain combustion as it does not catch fire easily at lower temperatures. When burning, LDPE can release potentially toxic fumes, including carbon monoxide and specific hydrocarbons, making adequate ventilation crucial in case of a fire. In applications where fire resistance is needed, alternative materials or flame-retardant additives might be considered.

To prep polypropylene plastic for paint, start by thoroughly cleaning the surface with soap and water to remove any contaminants or grease. Dry it completely. Next, sand the plastic with a fine-grit sandpaper (around 220-300 grit) to create a surface that the paint can adhere to more easily. This step is crucial, as polypropylene is non-porous and has a naturally low surface energy, which makes adhesion difficult. After sanding, wipe down the plastic with a clean cloth to remove dust. Applying a plastic primer is highly recommended; it will increase paint adhesion and longevity. Choose a primer and paint specifically designed for use on plastic surfaces. After applying the primer and allowing it to dry according to the manufacturer’s instructions, you can then proceed to paint the polypropylene, applying thin, even coats and letting each dry before adding the next. This preparation ensures the best possible outcome for painting polypropylene plastic.