UHMW-PE
Tipo de material
Plástico
Nombre del material
UHMW-PE
Nombres alternativos
Ultra-High Molecular Weight Polyethylene | High-Modulus Polyethylene | HMPE
Compatibilidad de procesos
Mecanizado CNC, Moldeo por inyección
UHMW-PE en Mecanizado CNC y Moldeo por Inyección
El polietileno de peso molecular ultra alto (UHMW-PE) es un tipo de polietileno con un peso molecular muy alto.
UHMW-PE has minimal moisture absorption, excellent wear resistance, low friction, and high impact strength. It is known for its self-lubricating properties due to its low coefficient of friction. It is a thermoplastic material which softens when heated and hardens when cooled. UHMW-PE tends to melt rather than chip during machining, so we control the heat using higher cutting speeds and lower feed rates. Cooling is important to prevent overheating and melting, so we use coolants or air blasts during machining.
This material is lightweight, odorless, tasteless, and non-toxic. It shares properties with high-density polyethylene (HDPE) and offers additional benefits, such as resistance to concentrated acids, alkalis, and various organic solvents. It is highly resistant to corrosive chemicals, except for oxidizing acids. Furthermore, it has excellent abrasion resistance—up to 15 times more resistant than carbon steel in certain forms. Although its friction coefficient is similar to polytetrafluoroethylene (PTFE or Teflon), UHMW-PE has greater abrasion resistance.
Tabla de propiedades of UHMW-PE
| PROPIEDADES MECÁNICAS | |
|---|---|
| Resistencia a la tracción (UTS) | 38.6-48.3 MPa |
| Límite elástico(0.2% offset) | 21.4-27.6 MPa |
| Módulo de Young (elasticidad) | 0.894-0.963 GPa |
| Alargamiento a la rotura | 200-500% |
| Dureza | 3.4-8.3 HV |
| Propiedades físicas | |
| Resistencia UV | Bien |
| Ductilidad y flexibilidad | Excelente |
| Densidad | 0.93 g/cm³ |
| Resistencia química | Excelente |
| Porosidad | Bajo |
| Propiedades térmicas | |
| Temperatura máxima de servicio | 80-110°C |
| Coeficiente de dilatación térmica | 234-360 x 10^-6/°C |
| Conductividad térmica | 0.19-0.197 W/(m·°C) |
| Propiedades eléctricas | |
| Seguridad ESD | No |
Conocimientos básicos of UHMW-PE
What is UHMW-PE?
Ultra-high-molecular-weight polyethylene (UHMW-PE) is a type of polyethylene, a thermoplastic material. It has exceptionally long molecular chains, typically ranging from 3.5 to 7.5 million atomic mass units (amu). The extended chain structure enhances load transfer within the material, leading to outstanding toughness and the highest impact strength among thermoplastics.
This material has high abrasion resistance, low friction, self-lubrication, non-stick surface, chemical fatigue and impact resistance, and effective noise dampening. It is highly resistant to wear and abrasion, performing well even at extremely low temperatures (as low as -259 degrees C). However, it starts to lose its abrasion resistance around 185 degrees F. Due to its significant expansion/contraction rate when temperatures change, UHMW is not recommended for close tolerance applications in environments with frequent temperature variations.
Advantages of UHMW-PE
- Bajo coeficiente de fricción
- High chemical resistance
- Excellent impact strength
- Baja absorción de humedad
- Self-lubricating
- Ligero
- High wear resistance
- FDA-approved for food contact
- Alta resistencia a la tracción
- Abrasion-resistant
Applications of UHMW-PE
- Bulletproof vests
- Cintas transportadoras
- Implantes médicos
- Rodamientos y bujes
- Chute liners
- Ice rink barriers
- Marine fender pads
- Cable sheathing
- Cutting boards
- Gear wheels
- Synthetic ice surfaces
- Defense vehicle components
- Equipos de procesado de alimentos
- Componentes de automoción
- Wear strips
- Componentes de la bomba
- Rollers and pulleys
- Insulators
- Componentes aeroespaciales
- Textile industry parts
Machining UHMW-PE Preguntas frecuentes
Otros Materiales
PEEK
PEEK son las siglas de poliéter éter cetona, un polímero termoplástico semicristalino de alto rendimiento con excelentes propiedades mecánicas y de resistencia química.
Nylon
El nailon (poliamida ) es un termoplástico de ingeniería que puede termoformarse y mecanizarse en una gran variedad de formas.
ABS
El ABS (acrilonitrilo butadieno estireno) es un polímero termoplástico duro y resistente a los impactos compuesto de acrilonitrilo, butadieno y estireno.
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