WSP is a designation still encountered in nonwovens testing, particularly in older specifications, legacy method citations, and some equipment literature. Current official publications use the Nonwovens Standard Procedures (NWSP), a jointly maintained method system from INDA and EDANA for nonwoven materials and related products.
For laboratories, QA teams, and buyers, the practical takeaway is straightforward: a WSP citation usually points to a nonwovens test workflow that should be matched carefully to the exact designation, revision, and product requirement before equipment is selected or data is reported.
WSP Test Methods
WSP references are most relevant in nonwovens and related sheet-material testing. The broader method family covers physical properties, liquid-management behavior, and product-performance checks used across manufacturing, supplier qualification, product development, and routine laboratory comparison work.
Because current official publications use the NWSP prefix, older WSP citations should be checked against the exact requirement being called out in a customer specification, test plan, or purchase document.
Quick Definition
WSP is best understood as a legacy designation associated with the current NWSP nonwovens method family published by INDA and EDANA. It points to practical test procedures for nonwoven materials and related products rather than to a standalone public standards body.
Why WSP Test Methods Matter in Testing
These methods matter because they give laboratories and manufacturers a consistent way to evaluate how nonwoven materials behave under controlled conditions. That includes tear response, strength, elongation, absorbency, liquid handling, thickness, permeability, linting, and related product characteristics.
In real purchasing and lab workflows, the method designation influences specimen preparation, conditioning, fixture selection, force range, reporting format, and the comparability of results between suppliers, plants, and regions.
Common Materials or Application Areas Covered
The WSP and NWSP family is centered on nonwovens and related products. Coverage extends beyond a single property and includes both material-level and product-level procedures.
- Nonwoven fabrics and sheet materials
- Wipes and wiping materials
- Absorbent hygiene products
- Superabsorbent materials
- Highloft nonwovens and batting
- Selected composites and laminated nonwoven constructions
Common Test Types
The published method family spans a wide range of laboratory activities used to characterize nonwovens and related products.
- Absorption and liquid-management testing
- Abrasion and bursting resistance
- Electrostatic and optical property testing
- Air permeability and barrier-related workflows
- Stiffness and drape evaluation
- Tear strength testing
- Tensile, elongation, and penetration workflows
- Thickness and mass per unit area
- Linting and particulate-release testing
- Superabsorbent material testing
How to Read a WSP Designation
Current official method numbers use the NWSP format. The numeric portion identifies the procedure, the R value shows the revision count, and the year in parentheses indicates the stated year attached to that edition.
Current format example: NWSP 100.1.R0 (20).
Practical reading guide: the 100-series covers tear-strength methods, while the digits after the decimal distinguish the exact procedure.
Important note: older documents may still cite WSP numbers. When a requirement uses WSP instead of NWSP, the safest approach is to confirm the exact prefix, full method number, and cited edition before testing begins.
Featured Methods / References
The tear-strength group is one of the clearest equipment-linked areas in this family. These are current official NWSP designations in the 100-series that are especially relevant when comparing tear workflows for nonwoven fabrics.
| Method |
Testing Focus |
Typical Equipment Path |
| NWSP 100.1.R0 (20) |
Tearing Strength of Nonwoven Fabrics by Falling-Pendulum (Elmendorf) Apparatus |
Elmendorf tear tester, appropriate pendulum capacity, specimen cutter, reporting tools |
| NWSP 100.2.R1 (20) |
Tearing Strength of Nonwoven Fabrics by the Trapezoid Procedure |
Tensile tester with suitable grips, specimen cutting tools, data capture software |
| NWSP 100.3.R0 (20) |
Tearing Strength of Nonwoven Fabrics by the Tongue (Single Rip) Procedure using the Constant-Rate-of-Extension Tensile Testing Machine |
Constant-rate-of-extension tensile tester, suitable grips, specimen-preparation tools |
When a purchase specification calls out WSP 100.1 or a similar legacy citation, the method should be matched carefully to the current document naming and the exact customer requirement before running the test.
Methods by Application Area
The family is broad enough that buyers often narrow it by application area rather than by title alone. Grouping the methods this way can make equipment selection more efficient.
Nonwoven physical-property evaluation: tear, tensile, thickness, mass per unit area, air permeability, stiffness, and abrasion workflows for routine material characterization.
Wipes and liquid-management work: absorption, sorption, repellency, strike-through, wetback, and related fluid-handling procedures.
Absorbent hygiene and related products: retention, leakage-related studies, chemical extraction workflows, and selected product-performance methods.
Superabsorbent materials: methods for polyacrylate superabsorbent powders and related absorbency or retention properties.
Equipment Commonly Used with These Test Methods
The right equipment depends on the exact designation and specimen type, but several instrument families appear repeatedly across WSP and NWSP workflows.
Elmendorf tear testers: commonly used for falling-pendulum tear work in the 100-series.
Universal testing machines: commonly used for trapezoid tear, tongue tear, strip or grab strength, and related force-extension procedures.
Absorbency and liquid-management instruments: used for absorption, strike-through, wetback, and other fluid-handling workflows in wipes and hygiene testing.
Conditioning and specimen-preparation tools: important for atmosphere control, repeatable cutting, weighing, labeling, and consistent sample handling.
Basic physical-property instruments: balances, thickness gauges, air permeability systems, and similar tools support routine nonwoven characterization across the method family.
Related Standards Organizations or Related Frameworks
WSP and NWSP methods sit within a broader nonwovens testing environment that often includes trade-association methods and internationally recognized standards.
INDA: co-develops and distributes the method family for the nonwovens industry.
EDANA: co-develops and maintains the method family and supports its use across European and international nonwovens markets.
ISO and CEN: often matter in the same testing programs when customers, suppliers, or regulators also work with international or European standards.
In practice, laboratories often compare the customer requirement first, then determine whether the requested work should follow NWSP directly or be coordinated with another named standard.
Talk With NextGen About Equipment for WSP / NWSP Methods
If your requirement cites WSP or NWSP, the best starting point is the exact method number, material type, and reportable property. That information usually determines whether you need an Elmendorf tear tester, a tensile system, an absorbency setup, conditioning equipment, or a broader nonwovens test bench.
NextGen can help match the cited method to practical equipment configurations, specimen-preparation tools, fixtures, accessories, and reporting options that fit the lab workflow behind the requirement.