CN Quality Check
Standards Comparison Tool
EXECUTIVE SUMMARY
BS EN ISO 787 is a multi-part TIER 2 test-method series for pigments and extenders (颜料和体质颜料), not a product specification. Its Chinese counterpart is the GB/T 5211 series (颜料和体质颜料通用试验方法). Equivalence is largely IDT/MOD at method level, but GB/T 5211.15-1988 is officially WITHDRAWN (废止) — buyers must not cite it. Most important implication: ISO 787 sets HOW to measure; PASS/FAIL limits come from separate TIER 1 product standards (e.g. GB/T 1706 for TiO₂).
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 5211.1 | 颜料和体质颜料通用试验方法 第1部分：颜料颜色的比较 (Comparison of colour) | Colour comparison | Recommended | Current |
| GB/T 5211.2 | 第2部分：在105°C挥发物的测定 (Matter volatile at 105°C) | Volatiles | Recommended | Current |
| GB/T 5211.3 | 第3部分：水溶物的测定 热萃取法 (Matter soluble in water — hot extraction) | Water-solubles | Recommended | Current |
| GB/T 5211.4 | 第4部分：水萃取液酸碱度的测定 (Acidity/alkalinity of aqueous extract) | pH of extract | Recommended | Current |
| GB/T 5211.5 | 第5部分：吸油量的测定 (Oil absorption value) | Oil absorption | Recommended | Current |
| GB/T 5211.15-1988 | 颜料吸油量的测定 (Determination of oil absorption value) | Oil absorption | Recommended | WITHDRAWN (废止) — do NOT cite |
| GB/T 1706 | 二氧化钛颜料 (Titanium dioxide pigments) | TIER 1 product spec | Recommended | Current |
⚠️ GB/T 5211 part-number-to-ISO-part mapping is NOT 1:1 across all parts. Verify each part individually.
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| BS EN ISO 787 (series) | TIER 2 — Test Method | Defines HOW to test pigments/extenders |
| GB/T 5211 (series) | TIER 2 — Test Method | Chinese equivalent test methods |
| GB/T 1706 / ISO 591-1 | TIER 1 — Product Standard | Sets PASS/FAIL limits |
⚠️ FLAG: Using BS EN ISO 787 as a standalone procurement specification is a TIER MISAPPLICATION — it contains no acceptance limits. Pair with a TIER 1 product standard.
SCOPE BREAKDOWN
Colour comparison
Chinese standard: GB/T 5211.1: 颜料颜色的比较 (Comparison of colour of pigments)
International equivalent: BS EN ISO 787-1:1995 (adopting ISO 787-1:1982)
Equivalence: IDT (method-level)
Standard tier match: Both TIER 2 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Colour comparison method | Visual comparison [Verify: GB/T 5211.1 ~clause] | Visual comparison (ISO 787-1 §) | identical method | 直接互认 (Direct mutual recognition) | LOW |
Volatiles at 105°C
Chinese standard: GB/T 5211.2 (在105°C挥发物的测定)
International equivalent: BS EN ISO 787-2:1995 (ISO 787-2:1981)
Equivalence: IDT
Standard tier match: Both TIER 2 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Test temperature | 105°C [Verify: GB/T 5211.2 ~clause] | 105°C (ISO 787-2 §) | identical | 直接互认 (Direct mutual recognition) | LOW |
Oil absorption value
Chinese standard: GB/T 5211.5 (吸油量的测定)
International equivalent: BS EN ISO 787-5:1995 (ISO 787-5:1980)
Equivalence: IDT
Standard tier match: Both TIER 2 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Method | Spatula rub-out [Verify: GB/T 5211.5 ~clause] | Spatula rub-out (ISO 787-5 §) | identical | 直接互认 (Direct mutual recognition) | LOW |
Water-soluble sulphates/chlorides/nitrates
Chinese standard: GB/T 5211 series (对应部分) [Verify part number]
International equivalent: BS EN ISO 787-13 (ISO 787-13)
Equivalence: MOD (verify)
Standard tier match: Both TIER 2
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Ion determination | [Verify: GB/T 5211 ~part/clause] | ISO 787-13 method | Verify | 附加测试后互认 (Mutual recognition after additional testing) | MEDIUM |
KEY DIFFERENCES SUMMARY
- GB/T 5211.15-1988 WITHDRAWN (废止) — do not cite; use current oil-absorption part. Mutual recognition: N/A. Impact: HIGH.
- TIER 2 vs TIER 1 confusion — ISO 787 sets no limits. Impact: HIGH.
- Part-number mapping not 1:1 — verify each part. Impact: MEDIUM.
- Method-level equivalence largely IDT for colour, volatiles, oil absorption. Impact: LOW.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | N/A (test methods not certified) | N/A |
| Engineering acceptance inspection | GB 50210-2018 (装修工程验收) where applicable | Local building regulation |
| Import/export compliance | CCIB commodity inspection | Destination customs |
| Designer/engineer obligation | N/A for product standard comparison | N/A |
AUDIT FLAG RESOLUTION
- 🔴 CRITICAL CORRECTION: GB/T 5211.15-1988 is WITHDRAWN (废止) per official SAMR status — must not be cited as current.
- ✅ FALSE POSITIVE (domain flag): BS EN ISO 787 used as test method — valid; it is TIER 2 by design.
- ⚠️ UNRESOLVED: GB/T 5211 part-to-ISO-part mapping — verify against each GB/T 5211 part text.
PROCUREMENT VERDICT
- Never cite GB/T 5211.15-1988 — confirm current replacement part.
- Pair ISO 787 test methods with a TIER 1 product standard (e.g. GB/T 1706).
- Specify exact ISO 787 part number in all POs.
- Verify GB/T 5211 part mapping per property.
- Confirm test lab accreditation for each method.
- Obtain official standard texts before acceptance testing.
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 5211.1–.5 § — confirm method clauses and current status
- GB/T 5211.15-1988 — confirm withdrawal and replacement
- GB/T 1706 § — TIER 1 TiO₂ acceptance limits
- ISO 787-13 § — ion determination method
FIELD INSPECTION CHECKLIST
- Verify test lab holds current GB/T 5211 method accreditation.
- Confirm ISO 787 part number matches PO.
- Check oil-absorption method matches current (non-withdrawn) standard.
- Verify TIER 1 product spec limits are separately stated.
- Confirm batch test reports cite correct standard editions.
CONFIDENCE RATING
🟡 MEDIUM — core structure verified across two sources; GB/T 5211 part-mapping and several clauses flagged for official text confirmation.
Technical comparison report — CN Quality Check Standards Tool. NOT a substitute for official standard texts or on-site verification. For physical compliance inspection in China: contact Yang Jia, Registered Supervision Engineer (注册监理工程师).
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