Jis H 8625 Pdf Apr 2026

JIS H 8625 is an excellent, demanding, and well-structured standard for architectural anodizing. Its reliance on CASS testing and quantitative admittance sets it apart from softer international standards. However, it is not the heaviest-duty standard (AAMA is tougher for coastal US), and its low thickness limit (9 µm) requires the specifier to add a note for aggressive environments.

The standard introduces the CASS Test (Copper Accelerated Acetic Acid Salt Spray) as mandatory for top-tier finishes. This is brutal. Many Western standards only require neutral salt spray (NSS). JIS H 8625 demands copper-accelerated testing to simulate severe marine/industrial environments. 3. The Critical Classification System | Feature | Class I (Superior) | Class II (General) | | :--- | :--- | :--- | | Min. Thickness | ≥ 9 µm (often spec’d higher) | ≥ 7 µm | | Sealing Quality | Excellent (Low admittance) | Good | | CASS Test (8 hrs) | No corrosion pits after 8h | Pits allowed but limited | | Application | Coastal areas, high pollution, curtain walls | Inland, mild environments, window frames |

Note: JIS H 8625 is the Japanese Industrial Standard for . Deep Review: JIS H 8625 – The Benchmark for Architectural Anodizing 1. Executive Summary JIS H 8625 is not just a specification; it is the de facto global benchmark for high-performance architectural anodizing. While other standards (ISO 7599, AAMA 611, BS 3987) exist, JIS H 8625 is uniquely rigorous because it separates anodized finishes into two distinct classes (Class I and Class II) based on sealing quality and corrosion resistance , rather than just coating thickness. jis h 8625 pdf

If you are specifying anodized aluminum for building facades, curtain walls, or windows, this PDF document is arguably more critical than any other single reference. Unlike decorative anodizing standards, JIS H 8625 is exclusively for architectural exteriors . The standard acknowledges that buildings face acid rain, coastal salt, UV radiation, and alkaline cement runoff.

⚠️ Surprisingly, the standard does not cover color anodizing (electrolytic or integral color). It assumes clear or naturally toned oxide. For colored anodizing, you must cross-reference JIS H 8601. JIS H 8625 is an excellent, demanding, and

✅ In Southeast Asia, the Middle East, and Japan, contractors will only accept JIS H 8625 Class I. LEED projects often reference it as an equivalent to AAMA 611. 6. Weaknesses & Criticisms ⚠️ Complexity & Cost: Running CASS tests and admittance meters requires dedicated labs. Small anodizers cannot certify to Class I. Expect a 15-25% cost premium over generic anodizing.

✅ Unlike the simpler dye spot test (ASTM), JIS’s admittance test gives a numeric value, allowing statistical process control in the anodizing plant. The standard introduces the CASS Test (Copper Accelerated

⚠️ The PDF does not define what "architectural" means. A bicycle part or an electronic housing could theoretically claim JIS H 8625 if it passes the tests, but the standard was not designed for that. 7. Comparison with Other Standards (Critical Table) | Property | JIS H 8625 Class I | ISO 7599:2018 AA10 | AAMA 611 Class I | | :--- | :--- | :--- | :--- | | Min Thickness | 9 µm | 10 µm | 18 µm | | Seal Test | Admittance (≤20 µS) | Dye spot or Admittance | Acid dissolution | | Corrosion Test | CASS 8h | NSS 336h | NSS 3,000h + CASS 24h | | Typical Lifetime | 10-15 years | 5-10 years | 20+ years | | Cost | Moderate | Low | High |