Overview
Transparent granular raw materials are polymer-based compounds prized for their optical clarity and mechanical properties. Commonly used polymers include polycarbonate (PC), polymethyl methacrylate (PMMA), and polystyrene (PS). These materials are manufactured through processes like extrusion or polymerization, resulting in uniform granules suitable for further processing. These granules are favored in industries requiring transparency, such as automotive lighting, medical devices, and consumer electronics. Their versatility allows for injection molding, extrusion, or blow molding, making them a staple in high-performance applications.
Physical and Chemical Properties
Transparent granules exhibit high light transmittance (up to 92% for PMMA) and excellent dimensional stability. Their thermal properties vary: PC withstands temperatures up to 135°C, while PMMA softens at 90°C. Most are resistant to weak acids and alkalis but degrade under prolonged UV exposure unless stabilized. Density ranges from 1.1 g/cm³ (PS) to 1.4 g/cm³ (PC), impacting weight considerations in final products. Solubility is negligible in water but varies in solvents like acetone or chloroform, which is critical for post-processing techniques such as solvent welding.
Main Applications
In packaging, these granules are molded into clamshells, blister packs, and cosmetic containers due to their clarity and rigidity. The automotive sector uses them for tail lights, dashboards, and sunroof panels, leveraging their impact resistance (especially PC). Optical applications include lenses, light guides, and displays, where PMMA’s scratch resistance and PC’s durability are prioritized. Medical-grade variants meet FDA standards for devices like IV connectors or surgical tools, emphasizing biocompatibility and sterilizability.
Safety and Storage
Granules should be stored in moisture-proof containers at temperatures below 30°C to prevent clumping or degradation. Some polymers, like PS, are flammable and require fireproof storage. Dust control is essential to avoid respiratory hazards; localized exhaust ventilation is recommended. During processing, overheating can release fumes (e.g., styrene from PS), necessitating proper ventilation and PPE. Material Safety Data Sheets (MSDS) must be reviewed for specific handling protocols, including first-aid measures for eye or skin contact.
B2B Procurement Guide
Buyers should specify requirements such as melt flow index (MFI), UV stabilizer content, and regulatory certifications (e.g., FDA, RoHS). Bulk purchases (1+ metric tons) often reduce costs by 10–20%, but sample testing is advised to confirm batch consistency. Suppliers in China (e.g., Sinopec) and Europe (Covestro) dominate the market, with lead times of 2–6 weeks. Payment terms like LC or TT are common. For custom formulations, MOQs typically start at 5 tons, with price premiums of 15–30% for specialized additives like anti-static agents.
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