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what are three primary colors of pigment
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Drilling screws into PVC requires precision and caution to prevent cracking the material. First, choose the right type of screw: self-tapping screws are ideal as they're designed to bore their own holes. Begin by marking the spot where you want to install the screw. It's recommended to pre-drill a pilot hole in the PVC to ensure the screw enters easily and to reduce the risk of the PVC splitting or cracking; ensure the drill bit is slightly smaller than the screw's core diameter. When drilling the pilot hole, use a low speed to maintain control and prevent heat buildup, which can melt or warp the PVC. Once the pilot hole is ready, align the screw with the hole and gently screw it in place using either a screwdriver or a drill set to a low torque. Keep a steady pressure to ensure the screw goes in straight and does not strip the hole. Avoid overtightening as it may cause the material to crack.
Polypropylene glycol (PPG), under most circumstances, shows low acute toxicity in humans. Toxicity levels can vary based on molecular weight and formulation. Generally, ingestion of small amounts (e.g., from cosmetics or pharmaceuticals) is considered to have low toxicity. However, higher doses, especially above 20 grams for an average adult, can lead to symptoms like nausea, vomiting, and diarrhea. It's important to distinguish between PPG and its relatives, like ethylene glycol, which is significantly more toxic. The precise toxic dose can depend on individual health, the specific type of PPG, exposure route, and duration. Chronic exposure or high-dose ingestion necessitates medical evaluation. As with all chemicals, appropriate handling and usage instructions should be followed to avoid adverse effects.
Super glue, known scientifically as cyanoacrylate, typically struggles to bond polyethylene (PE) and polypropylene (PP) effectively. These plastics have a non-porous, chemically resistant surface that prevents the super glue from adhering well. For PE and PP, a specialized adhesive designed for low surface energy plastics is recommended. Solutions like surface treatments (e.g., corona or plasma treatment) can improve the adhesion by modifying the surface chemistry, but for most casual or household applications, seeking an adhesive labeled specifically for PE and PP is the best approach.
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