Guía de dureza del TPU - Elección de Shore A 85A a 98A para su aplicación

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TPU (Thermoplastic Polyurethane) offers an incredible range of flexibility, from rubber-band elastic to nearly rigid. Understanding Shore hardness ratings helps you select the perfect material for your application. This guide covers everything from Shore 85A to 98A.

Guía de dureza del TPU - Elección de Shore A 85A a 98A para su aplicación

Understanding Shore A Hardness

The Shore A scale measures the hardness of flexible materials. Lower numbers indicate softer, more flexible materials:

  • 85A: Very soft, extremely flexible
  • 90A: Soft, moderate flexibility
  • 95A: Medium-soft, some rigidity
  • 98A: Semi-rigid, limited flexibility

Compared to TPE, TPU offers better layer adhesion and easier printing.

TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application - technical

Shore 85A: Maximum Flexibility

Características

  • Extremely soft and rubbery
  • Excellent elongation (>500%)
  • High elasticity and recovery
  • Most challenging to print

Las mejores aplicaciones

  • Gaskets and seals
  • Phone cases with maximum grip
  • Vibration dampeners
  • Wearable devices

Printing Considerations

  • Requires direct drive extruder
  • Very slow speeds (10-20mm/s)
  • Minimal retraction
  • 220-240°C nozzle temperature

Like nylon, TPU benefits from dry storage.

Shore 90A: Balanced Flexibility

Características

  • Soft but manageable
  • Good elongation (400-500%)
  • Excellent recovery
  • Moderate print difficulty

Las mejores aplicaciones

  • Flexable hinges
  • Footwear soles
  • Protective bumpers
  • Flexible couplings

Printing Considerations

  • Direct drive recommended
  • Moderate speeds (15-25mm/s)
  • Standard retraction settings
  • 220-235°C nozzle temperature

Shore 95A: Semi-Flexible

Características

  • Noticeable stiffness
  • Moderate elongation (300-400%)
  • Buena estabilidad dimensional
  • Easier to print

Las mejores aplicaciones

  • Functional prototypes
  • Twistable components
  • Semi-rigid seals
  • Impact-resistant parts

Printing Considerations

  • Can work on Bowden setups
  • Normal speeds (20-30mm/s)
  • Standard settings mostly work
  • 225-240°C nozzle temperature

Shore 98A: Nearly Rigid

Características

  • Minimal flexibility
  • Low elongation (200-300%)
  • High dimensional accuracy
  • Fácil de imprimir

Las mejores aplicaciones

  • Semi-rigid enclosures
  • Functional brackets
  • Snap-fit components
  • Impact protection

Printing Considerations

  • Works on most printers
  • Normal printing speeds
  • Standard settings acceptable
  • 230-245°C nozzle temperature

Application Selection Guide

Solicitud Recommended Reason
Gaskets 85-90A Maximum sealing
Phone cases 90-95A Balance of grip and protection
Hinges 90-95A Flexibility without fatigue
Bumpers 95-98A Impact absorption
Snap fits 95-98A Predictable flex
Tires 85-90A Maximum grip

TPU Hardness Selection Table

Shore range Typical behavior Check before specifying
85A Soft, flexible and conformable Compression set, tear strength and wall support
90A Balanced flexibility and grip Repeated bending, abrasion and surface friction
95A Semi-flexible with better shape retention Snap-fit strain, impact and dimensional recovery
98A Near-rigid elastomer behavior Hardness after conditioning and actual load path

Shore hardness is not a complete material specification. Confirm the test standard, conditioning, density, tear, elongation, compression set and temperature range with the resin supplier, then test the finished geometry.

PREGUNTAS FRECUENTES

Guía de dureza del TPU - Elección de Shore A 85A a 98A para su aplicación
Guía de dureza del TPU - Elección de Shore A 85A a 98A para su aplicación
How do you know whether TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application fits a part?

TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application fits a part when its load capacity, temperature range, moisture exposure, wear behavior, and processing method match the real service conditions.

What properties should be checked for TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application?

Comprueba la resistencia mecánica, la rigidez, la resistencia a los impactos, la resistencia al calor, la absorción de humedad, la estabilidad dimensional, la fricción, el desgaste y la compatibilidad química.

What is the biggest selection risk for TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application?

El mayor riesgo es basarse en los valores de la ficha técnica sin tener en cuenta el entorno real, el método de procesamiento, la geometría de la pieza y el uso a largo plazo.

When should TPU Hardness Guide — Choosing Shore A 85A to 98A for Your Application be tested before production?

Se recomienda realizar pruebas cuando la pieza esté sometida a cargas, calor, productos químicos, humedad, tolerancias estrictas, requisitos normativos o un nuevo entorno operativo.

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