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EPDM rubber hose is a tubular rubber product used for conveying fluids, including gas, liquid or powder materials.

Rubber pipe is composed of inner and outer rubber layer and skeleton layer. The skeleton layer material is mainly cotton fiber, synthetic fiber, carbon fiber, asbestos, steel wire, etc. Ordinary rubber tube inside and outside the rubber layer material for natural rubber, styrene butadiene rubber or butadiene rubber; Neoprene, nitrile butadiene, ethylene propylene, fluorine or silicone rubber.

Common faults of rubber hose are as follows:

1.Fault analysis of outer rubber layer

Cracks appear on the surface of the rubber hose. The main reason for cracks on the surface of rubber hose is that the hose is bent in cold environment.

The external surface of the rubber hose bubbles. The main reason for bubbling on the outside surface of rubber hose is poor quality or improper use of rubber hose.

The hose didn’t break, but there was a lot of oil. The reason is that when the hose passes through the high-pressure liquid flow, the inner glue is corroded or scratched, and the steel wire layer leaks in a large area, leading to a large amount of oil leakage.

The rubber layer outside the rubber hose is seriously deteriorated, and the surface cracks are the natural aging of the rubber hose. Aging and deterioration lead to continuous oxidation of the outer layer, and the surface is covered with ozone, which thickens over time. Once the rubber hose is slightly bent during use, it will produce a slight crack. Replace the hose in time.

2.Fault analysis of inner rubber layer

The rubber layer in the rubber hose is hard and cracked. The main reason is that rubber products contain plasticizer, so that rubber hose flexible plastic. But overheated rubber hoses can spill plasticizer.

The rubber layer in the rubber hose deteriorated badly and expanded significantly. The reason for the serious deterioration and obvious expansion of the rubber layer in the rubber hose is that the rubber material in the rubber hose is incompatible with the oil of the hydraulic system, and the chemical deterioration of the rubber hose.

1.Strengthen layer fault analysis

The rubber hose ruptured and rusted steel wire woven near the breach, causing the hose to break. Mainly due to the influence of moisture or corrosive substances in the layer, the hose strength is reduced, leading to high pressure rupture.

Rubber hose reinforcement layer does not rust, but the reinforcement layer broken wire irregular. The main reason is high frequency shock to the rubber hose.

2.Rupture fault analysis

The rubber hose is broken in one or more places, in good order and otherwise in good condition. The main reason is that the system pressure is too high, exceeding the hose pressure capacity.

Torsion at the rupture of the rubber hose. The main problem is excessive twisting of rubber hoses during installation or use.

Precautions for using EPDM rubber hose

The rubber hose should be arranged as far as possible to avoid heat, away from the engine exhaust pipe. If necessary, a casing or protective screen can be used to prevent the hose from deterioration due to heat.

Where the rubber hose crosses or may rub with the mechanical surface during operation, protective devices such as hose clamps or springs should be equipped to protect the outer layer of the hose from damage.

When the hose must be bent, please note that the bending radius should not be too small, the normal outer diameter should be greater than 9 times. The connection between the hose and the connector should have a straight line, which is greater than twice the pipe diameter.

Avoid fastening the hose when installing it. The hose should remain loose even if there is no relative motion between the two ends of the hose. The fastening hose expands under pressure and decreases in strength.

Please be careful not to twist the hose during installation. If the hose is slightly twisted, it may reduce its strength and loosen the joint. When assembling, the joint should be tightened to the hose, not to the joint. If hoses are connected to key components, check or replace them periodically.

Causes of rubber tube aging:

First: external environmental reasons
mainly aerobic, oxide, ozone, heat, light, radiation, mechanical fatigue, lack of processing process, etc. The effect of ozone is enhanced. With the increase of ozone in the atmosphere, the chemical activity of ozone is strengthened, the destruction is increased, it makes the molecular chain break. The influence of ozone on the food grade silicone tube is increased, and the ozone mainly acts on the deformed silicone rubber to produce ozone cracking phenomenon. Oxidation is also an aspect of silica gel aging. Oxygen in rubber with silica gel molecules aging effect, molecular chain breaks, causing the change of silica gel properties.

Second: internal structure reasons
mainly rubber types, forming methods, bonding degree, with the type of drugs, factors in the process of processing.

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