TPU Elastic Non-Woven Thickness: Measurement and Specifications
Understanding TPU elastic non-woven thickness — how it's measured, typical ranges, and application considerations
Thickness is a critical specification for many applications. TPU elastic non-woven thickness affects barrier properties, handfeel, and converting performance.
Here's what you need to know about thickness specifications.
Thickness vs. GSM Relationship
TPU non-woven thickness is related to basis weight (GSM) and material density:
Thickness (mm) = GSM / (1,000 × Density)
TPU density is typically 1.1-1.25 g/cm³ depending on formulation. This means:
| GSM | Approximate Thickness (mm) | Typical Applications |
|---|---|---|
| 15 g/m² | 0.012-0.014 mm | Ultra-light barrier layers |
| 30 g/m² | 0.024-0.027 mm | Hygiene backsheets, medical gowns |
| 50 g/m² | 0.040-0.045 mm | Industrial filtration, apparel |
| 100 g/m² | 0.080-0.091 mm | Heavy-duty applications |
| 150 g/m² | 0.120-0.136 mm | Structural components |
Thickness Measurement Methods
Standard test methods:
- ASTM D1777: Standard test method for thickness of textile materials
- ISO 5084: Textiles — determination of thickness of textiles and textile products
- Pressure: Typically measured at 0.1 kPa or 0.5 kPa (higher pressure gives lower thickness reading)
Measurement note: Non-woven thickness varies across the web and with applied pressure. Reported thickness is typically an average of multiple measurements under standardized conditions.
Thickness Tolerance
Typical thickness variation:
- Standard tolerance: ±10% of nominal thickness
- Tight tolerance: ±5% available for critical applications (may increase cost)
- Across-web variation: Typically less than ±5% for well-controlled processes
Application-Specific Thickness Requirements
Barrier applications: Thicker materials generally provide better fluid barrier, but breathability decreases.
Converting operations: Thickness affects die-cutting, slitting, and lamination processes. Ensure your equipment can handle the specified thickness.
End-product design: Thickness affects packability (e.g., diaper thickness) and drape (how the material hangs).
Contact us to discuss thickness specifications for your TPU non-woven application.
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