异步自测 511697 随机查询：钢结构防火涂料 厚度要求

EXECUTIVE SUMMARY

Scope: 钢结构防火涂料 (Fireproof coatings for steel structures) — product standard vs test method. GB 14907-2018 is a TIER 1 mandatory product standard; BS 476-20 is a TIER 2 test method — not directly comparable. The correct international counterpart is EN 13381-4/-8 (test method for protected steel members). Thickness is not fixed by GB 14907 — it is derived from the fire-resistance rating via the coating's tested 等效热阻/厚度曲线.

APPLICABLE CHINESE STANDARDS

STANDARD TIER CLASSIFICATION

⚠️ FLAG: BS 476-20 is a TIER 2 method for elements, not a coating product standard. Comparing it to GB 14907-2018 is a tier misapplication; use EN 13381-4/-8 for coating-system equivalence.

SCOPE BREAKDOWN

膨胀型钢结构防火涂料 (Intumescent fireproof coating)

Chinese standard: GB 14907-2018: 钢结构防火涂料

International equivalent: EN 13381-8:2013 — Applied reactive protection to steel members — ⚠️ BS 476-20 is NOT the product counterpart

Equivalence: NEQ (different tier and method)

Standard tier match: ⚠️ Tier mismatch: CN TIER 1, BS 476-20 TIER 2

非膨胀型钢结构防火涂料 (Non-intumescent fireproof coating)

Chinese standard: GB 14907-2018

International equivalent: EN 13381-4:2013 — Passive protection applied to steel members

Equivalence: NEQ

Standard tier match: ⚠️ Tier mismatch: CN TIER 1, BS 476-20 TIER 2

KEY DIFFERENCES SUMMARY

• Tier mismatch — GB 14907-2018 (product) vs BS 476-20 (test method). No direct comparison. → 不可互认 (Not mutually recognised). HIGH
• Thickness — GB 14907 sets no fixed thickness; it is read from the coating's tested 厚度-耐火极限 curve. BS 476-20 specifies none. → 不可互认 (Not mutually recognised). HIGH
• Bond strength — CN requires ≥0.20 MPa (intumescent) / ≥0.04 MPa (non-intumescent) [Verify §5]; not in BS 476-20. → 不可互认 (Not mutually recognised). MEDIUM
• Fire test route — CN uses GB/T 9978.1; UK uses BS 476-20/21 or EN 13381-4/-8. → 附加测试后互认 (Mutual recognition after additional testing). HIGH

REGULATORY LINKAGE TABLE (法规联动)

AUDIT FLAG RESOLUTION

• ✅ RESOLVED: GB 14907-2018 is CURRENT — no supersession note. GB 14907-2026 pending (effective 2027-09-01).
• ✅ FALSE POSITIVE (domain flag): BS 476-20 — flagged as misapplication; usage valid only as TIER 2 element test method, not a coating product standard.
• ⚠️ UNRESOLVED: Bond strength values (≥0.20 / ≥0.04 MPa) — verify GB 14907-2018 §5.
• 🔴 CRITICAL CORRECTION: Never write "GB/T 14907" — it is GB 14907 (mandatory).

PROCUREMENT VERDICT

• Do not treat BS 476-20 as the coating product counterpart — require EN 13381-4/-8 evidence.
• Obtain the coating's tested 厚度-耐火极限 curve for the required rating.
• Confirm bond strength per GB 14907-2018 §5.
• Verify CCCF certification for the specific coating.
• Confirm GB 50205-2020 acceptance on-site.
• Note GB 14907-2026 transition (2027-09-01).

REFERENCE DOCUMENT CHECKLIST (配套调阅清单)

• GB 14907-2018 §5 — bond strength, thickness-performance curve
• GB/T 9978.1-2008 — fire test method
• EN 13381-4:2013 / -8:2013 — coating-system test method
• GB 50205-2020 — acceptance criteria

FIELD INSPECTION CHECKLIST

• Verify coating type (膨胀型/非膨胀型) matches spec.
• Measure applied thickness vs tested curve.
• Check bond strength test report.
• Confirm CCCF mark and batch traceability.
• Verify substrate preparation per GB 50205-2020.

CONFIDENCE RATING

🟡 MEDIUM — core tier/scope verified; bond-strength and thickness-curve values 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).