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D2724-19 – Standard Test Method Technical Guide
ASTM D2724-19 provides standardized procedures for determining the bond strength of bonded, fused, and laminated apparel fabrics. The test method evaluates material performance as-received and after exposure to laundering or drycleaning, making it essential for quality assurance and acceptance testing.
📐 Specimen Preparation and Types
Specimens are prepared to standard dimensions for tensile testing. All materials must be conditioned in the standard atmosphere per ASTM D1776 (21 ± 1 °C, 65 ± 2% RH). For durability testing, specimens are first processed using AATCC TM135 (laundering) or TM158 (drycleaning).
| 🔍 Parameter | 📏 Specification |
|---|---|
| 🟦 Specimen Width | 50 mm (2 in) |
| 📐 Gage Length | 75 mm (3 in) |
| 🌡️ Standard Atmosphere | 21 ± 1°C, 65 ± 2% RH |
| 🏷️ Bond Types Covered | Bonded, Fused, Laminated |
💡 Tip: Ensuring consistent conditioning per D1776 is critical for accurate bond strength results.
⚙️ Test Procedure and Speed Selection
Testing utilizes a Constant-Rate-of-Extension (CRE) machine conforming to ASTM D76. The fabric plies are separated at a standard speed of 300 ± 10 mm/min. Bond strengths are recorded for the as-received, laundered, or drycleaned states.
| 🎯 Parameter | ⚡ Requirement |
|---|---|
| 🥇 Machine Type | Constant-Rate-of-Extension (CRE) |
| 🚀 Crosshead Speed | 300 ± 10 mm/min (12 ± 0.5 in/min) |
| 📐 Grip Faces Width | 25 mm (1 in) |
| 📦 Test States | As received, After Drycleaning, After Laundering |
⚠️ Safety Note: Users must establish appropriate safety practices. Refer to the specific warning in D2724-19 Section 6.1.1 regarding potential hazards.
📊 Key Measured Properties and Acceptance Criteria
The primary result is bond strength, expressed in N/m. This method is approved for acceptance testing of commercial shipments. For inter-laboratory discrepancies, D2724-19 Section 5.1.1 mandates a comparative protocol using homogeneous samples and statistical analysis to resolve bias.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2724-19?
It covers procedures for characterizing the bond strength of bonded, fused, and laminated apparel fabrics, tested as-received or after drycleaning and laundering.
💡 How should discrepancies between two laboratories be handled?
Per Section 5.1.1, comparative tests must be performed using homogeneous samples from the same lot. Specimens are randomly assigned in equal numbers, and results are evaluated with competent statistical assistance.
⚡ What are the standard conditioning requirements?
All testing follows Practice D1776, requiring a standard atmosphere of 21 ± 1 °C (70 ± 2 °F) and 65 ± 2% relative humidity.
📌 Which AATCC standards are referenced for care procedures?
The standard references AATCC TM135 (laundering), TM158 (drycleaning), LP1 (machine washing), and LP2 (hand washing) for simulating care treatments.