This document specifies the requirements for rubber hoses and hose assemblies for wet and dry sand and grit blasting, suitable for use up to a maximum working pressure of 0,63 MPa (6,3 bar) and over an operating temperature range of −25 °C to +70 °C.th edition 2021-01 Rubber hoses and hose assemblies for sand and grit blasting — Specification Tuyaux et flexibles en caoutchouc pour sablage et grenaillage — Spécifications Reference number ISO 3861:2021(E) ？ ISO 2021 ISO 3861:2021(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2021 All rights reserved. Unless otherwise specified, or required in the context o