ISO 3861 Rubber Hoses and Hose Assemblies for Sand and Gravel Blasting - Specification

The standard “ISO 3861 Rubber hoses and hose assemblies for sand and gravel spraying – Specification” published by the International Organization for Standardization (ISO) describes the requirements for rubber hoses and hose assemblies for wet and dry sand and grit spraying, suitable for a maximum working pressure of 0,63 MPa (6,3 bar) and an operating temperature range of minus 25 degrees Celsius to plus 70 degrees Celsius.

For the purposes of this standard, the terms and definitions given in the ISO 8330 standard apply.

Hoses and hose assemblies are specified based on their electrical characteristics as follows:

Electrically connected, designated and marked as class “M”
Designated and marked as electrically conductive class “Ω” using a conductive rubber layer

The hose must consist of:

Rubber lining
Natural or synthetic textile reinforcement applied by any suitable technique
Rubber sheath

Depending on the class, the structure may include a conductive rubber layer or a bonding wire or wires of at least nine wires with high fatigue resistance. The liner and sheath must be concentric and of uniform thickness to meet the minimum thickness specified in this standard. The liner and sheath must be free of holes, pores, and other defects. The sheath surface may be smooth or fabric-marked.

The dimensions are determined in this standard as follows:

Internal diameters and tolerances: When measured in accordance with the ISO 4671 standard, internal diameters and tolerances must comply with the values specified in the table provided in the standard.
Concentricity: When determined according to ISO 4671, the concentricity based on the total indicator reading between the inside diameter and the outside surface of the cap should not be greater than 1,0 mm.
Length tolerance: When measured according to the ISO 4671 standard, the tolerance on cutting lengths should be as specified in the ISO 1307 standard.
Minimum thickness of liner and cover: When measured according to ISO 4671 standard, the minimum thickness of the rubber liner shall be 5,0 mm and the minimum thickness of the cover shall be 1,0 mm.

In the case of rubber compounds, the physical properties of the compounds used for lining and coating, when tested using the methods listed in the table provided in the standard, must conform to the values specified in the table. Tests should be conducted on samples taken from the hose or individually vulcanized sheets, 2 mm thick for tensile/elongation tests and thicker for abrasion tests. These should be vulcanized to the same cure state as the production hoses.

Finished hoses and hose assemblies, when measured by the methods listed in the table provided in the standard, shall have physical properties that conform to the values specified in the table.

Type testing and routine testing are performed as specified in the standard's annex (Annex A). Type testing is the test required to verify that a specific hose design manufactured by a specified method meets all the requirements of this standard. Tests are repeated at intervals of up to five years or whenever there is a change in the production method or materials used. Tests are performed on all sizes and on all classes and types except those of the same size and construction. Routine testing is the test that should be performed on each length of finished hose before shipment. Production acceptance tests are the tests specified in the standard's annex (Annex B), which should preferably be performed to verify production quality. The frequencies specified here are provided as a guide only.

The ISO 3861 standard is essential because it provides internationally recognized specifications for rubber hoses used in air applications, particularly in compressors and pneumatic systems. The key reasons for this standard's importance are:

Ensures safety: Air hoses under pressure can be hazardous if ruptured or disconnected. This standard ensures they can withstand the required operating conditions by defining materials, construction, and pressure ratings to reduce the risk of failure.
Standardizes quality across manufacturers: This standard provides a common benchmark for manufacturers worldwide. Hoses labeled accordingly are proven to meet minimum requirements for performance, durability, and reliability.
Facilitates global trade: Buyers and users can have confidence in the properties of hoses marked to this standard. This reduces the need for repetitive testing or special specifications when sourcing products internationally.
Supports interchangeability: Ensures compatibility of hoses and fittings across systems and manufacturers. Simplifies maintenance and replacement, especially in large industrial systems.
Reduces downtime and costs: By ensuring hoses perform as expected under defined conditions, this standard helps prevent unexpected failures, reducing downtime and maintenance costs.

In short, the ISO 3861 standard is essential to provide a consistent, safe and reliable framework for the manufacture and use of rubber air hoses, promoting efficiency, safety and compatibility in industrial and commercial pneumatic systems.

Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the ISO 3861 "Rubber hoses and hose assemblies for sand and gravel spraying - Specification."