Acrílico, commonly known as PMMA or Plexiglas, is derived from the English term “acrylic plastic” and refers to polymethyl methacrylate. It represents one of the early developments in plastic polymer materials, offering excellent transparency, chemical stability, weather resistance, ease of dyeing, and attractive appearance. Due to these properties, acrylic is widely used in the construction industry and can be categorized into cast sheets, extruded sheets, and molded plastics.
Mechanical Properties
Polymethyl methacrylate boasts strong overall mechanical properties, positioning it among the leading general-purpose plastics. Its tensile, bending, and compression strengths surpass those of polyolefins and are higher than those of polystyrene and polyvinyl chloride. While its impact toughness is relatively low, it is slightly better than that of polystyrene. Cast polymerized PMMA sheets, such as those used for aviation-grade Plexiglas, exhibit even higher tensile, bending, and compression strengths, reaching levels comparable to polyamide, polycarbonate, and other engineering plastics.
Typically, the tensile strength of PMMA ranges from 50 to 77 MPa, while its bending strength can reach between 90 and 130 MPa. The upper limits of these performance metrics can match or exceed those of some engineering plastics. However, PMMA has a low elongation at break of only 2%-3%, making it a hard and brittle plastic that is sensitive to gaps and prone to cracking under stress. Unlike polystyrene and ordinary inorganic glass, its fractures tend to be less sharp and uneven. The secondary transition temperature of PMMA is around 40°C, which corresponds to the temperature at which the side methyl groups begin to move; above this temperature, the material’s toughness and ductility improve. It is worth noting that PMMA has low surface hardness and is susceptible to scratching.
The strength of PMMA is influenced by the duration of stress application, decreasing as the duration increases. However, the mechanical properties of oriented PMMA (oriented Plexiglass) improve significantly after tensile orientation, enhancing both strength and notch sensitivity.
In terms of heat resistance, PMMA is not particularly high-performing. Its glass transition temperature is approximately 104°C, but the maximum continuous use temperature varies between 65°C and 95°C depending on working conditions. The heat deflection temperature is about 96°C (at 1.18 MPa), and the Vicat softening point is around 113°C. Heat resistance can be enhanced through copolymerization with acrylate methacrylate or glycol bis-ester acrylate. Cold resistance is also limited, with a brittleness temperature around 9.2°C. PMMA’s thermal stability is moderate, better than that of polyvinyl chloride and polyformaldehyde, but inferior to polyolefin and polystyrene, with a thermal decomposition temperature slightly above 270°C and a flow temperature around 160°C, allowing for a wide range of melt processing temperatures.
The thermal conductivity and specific heat capacity of PMMA are moderate among plastics, measuring 0.19 W/m·K and 1464 J/kg·K, respectively.
Proceso de pedido
Q1: Cómo enviar una solicitud de procesamiento?A: Puedes contactar con nosotros vía WhatsApp: +86 15323729231 or email [email protected].B: Admitimos formatos de archivo STEP/STL/IGES. También puedes enviar tus archivos a nuestro correo electrónico de servicio.. Nuestro sistema generará una cotización y procesará las recomendaciones dentro de 1 hora.
Q2: ¿Ofrecen sugerencias de optimización del diseño??A: Sí! Nuestro equipo de ingeniería ofrece un DFM gratuito (Diseño para la fabricabilidad) revisar, Proporcionar sugerencias de optimización para mejorar la estructura y reducir costos..
Precios & Entrega
Q3: ¿Cuál es la cantidad mínima de pedido? (Cantidad mínima de pedido)?A: Sin cantidad mínima de pedido! Aceptamos pedidos a partir de 1 pedazo, ya sea para impresión 3D o mecanizado CNC.
Q4: ¿Qué está incluido en la cotización??A: El presupuesto cubre los costes de material., tarifas de procesamiento, y tratamiento superficial básico (P.EJ., chorro de arena). Procesos adicionales (P.EJ., galvanoplastia, anodizado) se cotizará por separado.
Q5: ¿Cuál es el plazo de entrega estándar??
- Mecanizado CNC: 3-5 días (arriba a 7 días para piezas complejas)
- 3Impresión D: 72 horas
Tecnología & Calidad
Q6: ¿Cuál es la precisión del mecanizado??
- Mecanizado CNC: Creación rápida de prototipos con una tolerancia de ±0,05 mm, 0.1tolerancia de forma mm, y rugosidad de la superficie Ra1.6 o mejor.
- 3Impresión D:
- Piezas de resina: ±0.2mm
- Nylon parts: ±0,3 mm
- Plastic parts: ±0,3 mm
- Metal parts: ±0,3 mm
P7: ¿Qué materiales apoya??✅ CNC Machining:
- Aleación de aluminio: 6061, 7075
- Aleación de cobre: Latón (H59), Cobre rojo (T2)
- Acero aleado: 45# Steel
- Acero inoxidable: SUS304
- Plastics:
- Abdominales (Blanco, Negro)
- Pom (Blanco, Negro)
- Baquelita (Negro, Naranja)
- Acrílico (Transparente)
- Tablero epoxi FR4 (Verde)
- Nailon PA6 (Blanco)
- policarbonato (Transparente)
✅ 3D Printing:
- Resina, Nylon, Plásticos de ingeniería, Acero inoxidable
Servicio postventa
P8: ¿Qué pasa si las piezas no cumplen con los requisitos??A: Si se producen defectos debido a nuestros problemas de procesamiento, Garantizamos remanufactura gratuita..
