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D3775-17 – Standard Test Method Technical Guide
🧵 Overview and Scope of D3775
ASTM D3775 – 17 (Reapproved 2023) provides a standardized procedure for determining the end (warp) and pick (filling) count of woven fabrics. This test method is applicable to all types of woven fabric constructions and serves as a primary method for acceptance testing of commercial shipments within the textile industry.
Note on Commercial Acceptance: This standard is widely used in the trade for acceptance testing. If interlaboratory differences arise, comparative testing is recommended to establish statistical bias in accordance with standard practices.
The standard references several key ASTM documents for comprehensive textile testing, including Terminology D4850 for fabric test methods, Practice D1776 for conditioning, and ANSI/ASQC Z1.4 for inspection by attributes.
| 🟦 Standard | 📏 Title / Role |
|---|---|
| D4850 | Terminology Relating to Fabrics and Fabric Test Methods |
| D1776 | Practice for Conditioning and Testing Textiles |
| ANSI Z1.4 | Inspection by Attributes (Sampling) |
⚙️ Test Method and Reporting Units
The test method (Section 4) determines the number of ends and picks per unit distance. This can be performed using suitable magnifying and counting devices (e.g., a pick glass and needle) or by carefully raveling yarns from a known specimen width. Specimens must be conditioned according to Practice D1776 prior to testing.
💡 Historical Context: The broad term “fabric count” has historically been used to describe the end and pick count. Modern terminology favors the distinct terms end count and pick count to avoid ambiguity between warp and filling directions.
Reporting units depend on the system of measurement (Section 1.2.1). This global standard accommodates both metric and English systems without requiring a rigid 1:1 conversion.
| ⚡ Unit System | 🎯 Reported Count |
|---|---|
| Metric (SI) | Ends per 1 cm / Picks per 1 cm |
| English | Ends per 1 in. / Picks per 1 in. |
📊 Key Measured Properties
The primary property measured is the linear density of yarns in the fabric. The standard clearly delineates the terminology used:
| 🟦 Term | 📐 Definition |
|---|---|
| End | Individual warp yarn running lengthwise in a woven fabric. |
| Pick | Individual filling yarn running widthwise in a woven fabric. |
| End Count | Number of warp ends per unit distance (e.g., per 1 cm or per 1 in.). |
| Pick Count | Number of filling picks per unit distance. |
| Thread Count | Sum of the end count and pick count (total yarns per unit area). |
For further details on related textile structures, refer to Test Method D8007 for wale and course count of weft knitted fabrics, ensuring the correct standard is applied based on the fabric construction.
❓ Frequently Asked Questions
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