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Standards Comparison Tool
EXECUTIVE SUMMARY
This report covers GB/T 4802.1-2008, the Chinese test method for fabric pilling resistance via the circular locus method (圆轨迹法). Both the Chinese standard and its closest international analogues are TIER 2 test methods, but GB/T 4802.1 has no direct ISO equivalent — the circular locus method is a China-specific approach. The single most important procurement implication: buyers must specify test method explicitly, as results from GB/T 4802.1 are NOT interchangeable with ISO 12945-1 (pilling box) or ISO 12945-2 (Martindale) data.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 4802.1-2008 | 纺织品 织物起毛起球性能的测定 第1部分：圆轨迹法 (Textiles — Determination of fabric propensity to surface fuzzing and to pilling — Part 1: Circular locus method) | Pilling testing via circular locus instrument | Recommended | Current |
| GB/T 4802.2-2008 | 纺织品 织物起毛起球性能的测定 第2部分：改型马丁代尔法 (Textiles — Part 2: Modified Martindale method) | Pilling testing via Martindale abrasion | Recommended | Current |
| GB/T 4802.3-2008 | 纺织品 织物起毛起球性能的测定 第3部分：起球箱法 (Textiles — Part 3: Pilling box method) | Pilling testing via tumbling box | Recommended | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 4802.1-2008 | TIER 2 — Test Method | Defines how to test pilling via circular locus |
| ISO 12945-1:2020 | TIER 2 — Test Method | Pilling box method (different apparatus) |
| ISO 12945-2:2020 | TIER 2 — Test Method | Modified Martindale method (different apparatus) |
Tier match: All TIER 2 — valid comparison. FLAG: GB/T 4802.1 (circular locus) is often incorrectly paired with ISO 12945-1 (pilling box). These use different apparatus and are NOT equivalent methods — see scope breakdown.
SCOPE BREAKDOWN
Circular locus method (圆轨迹法)
Chinese standard: GB/T 4802.1-2008: 纺织品 织物起毛起球性能的测定 第1部分：圆轨迹法
International equivalent: None direct. Closest: ISO 12945-1:2020 (pilling box) and ISO 12945-2:2020 (Martindale) — ⚠️ different test principles
Equivalence: NEQ (no direct ISO counterpart for circular locus method)
Standard tier match: Both TIER 2 — valid comparison of test philosophy, not results
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Test principle | Circular rubbing head vs standard fabric (GB/T 4802.1-2008 §4) | Pilling box tumbling (ISO 12945-1:2020 §4) or Martindale abrasion (ISO 12945-2:2020 §4) | Different apparatus — no direct comparison | 不可互认 (Not mutually recognised) | HIGH |
| Pressure options | 3 methods: A/B/C with 780 cN typical [Verify: GB/T 4802.1-2008 §6] | Method-specific pressures [Verify: ISO 12945-2:2020 §6] | Different parameter sets | 不可互认 (Not mutually recognised) | HIGH |
| Specimen size | Circular specimen [Verify: GB/T 4802.1-2008 §5] | Different geometry per method | N/A (different methods) | 不可互认 (Not mutually recognised) | MEDIUM |
| Rub cycles | Method-dependent [Verify: GB/T 4802.1-2008 §6] | Method-dependent [Verify: ISO 12945-1:2020 §6] | Verify against official texts | 不可互认 (Not mutually recognised) | MEDIUM |
| Evaluation scale | 1–5 rating [Verify: GB/T 4802.1-2008 §8] | 1–5 rating (ISO 12945-1:2020 §8) | Identical scale concept | 附加测试后互认 (Mutual recognition after additional testing) | LOW |
KEY DIFFERENCES SUMMARY
- Test apparatus — Circular locus (CN) vs pilling box/Martindale (ISO). No direct comparison possible. Verdict: 不可互认 (Not mutually recognised). Impact: HIGH.
- Pressure parameters — GB/T 4802.1 specifies 780 cN typical; ISO methods use different loads. Verdict: 不可互认 (Not mutually recognised). Impact: HIGH.
- Method family mapping — GB/T 4802.2 (Martindale) ≈ ISO 12945-2; GB/T 4802.3 (pilling box) ≈ ISO 12945-1. Only GB/T 4802.1 lacks an ISO twin. Impact: MEDIUM.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | None for test method (GB/T is voluntary) | None — test method standard |
| Engineering acceptance inspection | GB/T 4802.1 used in textile QC per contract | ISO 12945 series per buyer spec |
| Import/export compliance | CCIB commodity inspection may reference GB/T 4802.1 | Destination country customs per contract |
| Designer/engineer obligation | N/A for product standard comparison | N/A |
AUDIT FLAG RESOLUTION
- ✅ FALSE POSITIVE (domain flag): GB/T 4802.1 — flagged as potential misapplication vs ISO 12945-1. Usage is valid ONLY if buyer understands circular locus ≠ pilling box. The Chinese standard is correctly classified as TIER 2 test method; the flag arises from incorrect assumption of ISO equivalence.
- ⚠️ UNRESOLVED: Exact pressure values and rub cycles — verify against GB/T 4802.1-2008 §6 and ISO 12945-1:2020 §6.
PROCUREMENT VERDICT
- Specify which test method (circular locus, Martindale, or pilling box) is required — do NOT assume equivalence.
- If ISO 12945-1 or -2 compliance is needed, reference GB/T 4802.2 or GB/T 4802.3 respectively, NOT GB/T 4802.1.
- Request lab report stating exact method and parameters used.
- Confirm evaluation scale (1–5) matches buyer's acceptance criteria.
- Verify pressure and rub cycle settings against official text before accepting test results.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 4802.1-2008 §6 — pressure and rub cycle parameters
- GB/T 4802.1-2008 §8 — evaluation scale
- ISO 12945-1:2020 §6 — pilling box parameters
- ISO 12945-2:2020 §6 — Martindale parameters
FIELD INSPECTION CHECKLIST
- Confirm instrument type: circular locus tester (圆轨迹起毛起球仪) vs Martindale vs pilling box
- Verify specimen preparation matches standard clause
- Check calibration certificate for test instrument
- Confirm operator follows correct method (A/B/C) per fabric type
- Review evaluation lighting conditions per standard
CONFIDENCE RATING
🟡 MEDIUM — core data verified (standard identity, tier classification, family mapping), but ≤3 parameters (pressure, rub cycles, specimen size) flagged for official text confirmation.
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