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Oil and gas industries including lower carbon energy. Completion fluids and materials - Measurement of properties of proppants used in hydraulic fracturing and gravel-packing operations. Original standard UNE-EN ISO 13503-2-2024 in PDF full version. Additional info + preview on request

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Oil and gas industries including low carbon energy. Design and operation of subsea production systems - General requirements and recommendations. Original standard UNE-EN ISO 13628-1-2025 in PDF full version. Additional info + preview on request

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Ophthalmic optics. Spectacle lenses. Vocabulary. Original standard UNE-EN ISO 13666-2019 in PDF full version. Additional info + preview on request

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Oil and gas industries including lower carbon energy - Corrosion-resistant alloy seamless products for use as casing, tubing, coupling stock and accessory material - Technical delivery conditions. Original standard UNE-EN ISO 13680-2025 in PDF full version. Additional info + preview on request

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Optics and photonics. Lasers and laser-related equipment. Test methods for the spectral characteristics of lasers. Original standard UNE-EN ISO 13695-2024 in PDF full version. Additional info + preview on request

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Safety of machinery Positioning of safeguards with respect to the approach of the human body (ISO 13855:2024). Original standard UNE-EN ISO 13855-2025 in PDF full version. Additional info + preview on request

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