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- Hydrogen quantification (ppm) in pure Al (4N-5N) or Al alloys finished products has become compulsory to guarantee high quality of 5N product.
- A low content (< 0.08-0.10 ppm H2) is the demonstration that casting processes are correctly mastered.
- This is necessary to prevent or reduce the formation of microshrinkages or microporosities in the as-cast products.
- Pechiney High Purity has developped a specific technique able to measure accurately the gas content in solid
products (see Hydrogen measurement).
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