Insulation Casing

Insulating conduit is a tubular material used in electrical installations to protect wires and cables, preventing electrical short circuits or leakage. It is made from materials with high electrical insulation properties,effectively isolating electrical wires and cables from other conductive bodies or environmental factors that could cause damage. Besides providing electrical insulation protection, insulating conduit also offers certain levels of waterproofing, dustproofing, and corrosion resistance, ensuring the safe operation of electrical systems.

Types of Insulation Casing

Silicone Fiberglass Sleeving

Silicone fiberglass sleeving is a type of protective tubing made from woven fiberglass coated with silicone rubber. This combination provides excellent electrical insulation, as well as significant resistance to heat, chemicals, and abrasion. The silicone coating adds flexibility and durability to the sleeving, making it an ideal choice for protecting wires and cables that are exposed to harsh environments or high temperatures.
Heat Shrinkable Sleeve

A heat shrinkable sleeve, also known as a heat shrink sleeve or tubing, is a versatile material made from thermoplastic that shrinks in diameter when exposed to heat. This property makes it an invaluable tool for electrical insulation, mechanical protection, and environmental sealing of cables, wires, joints, and terminals.
Silicone Tubing

Silicone tubing is a flexible, durable, and versatile type of tubing made from silicone rubber, a synthetic elastomer known for its stability and resistance to extreme environments. It is widely used across various industries for its exceptional performance in conditions where other materials might fail. Silicone tubing is particularly favored for applications requiring a clean, non-toxic, and biocompatible material that can withstand high temperatures, pressure variations, and exposure to harsh chemicals.

Manufacturing Process of Insulation Casting

Material Preparation

Raw material selection: Select suitable raw materials according to the application requirements of insulation sleeves, such as PVC powder, silicone raw materials, PTFE powder, etc.

Ingredients: Weigh and mix the raw materials to ensure their uniformity and specific performance requirements.

Extrusion molding

Mixing and heating: Put the prepared material into the hopper of the extruder, and through the heating of the extruder and the rotation of the screw, melt the material and mix it evenly.

Extrusion: The molten material is extruded through the mold of the extruder head to form a sleeve with the required diameter and thickness.

Cooling and shaping: The extruded sleeve is cooled by a cooling water tank to solidify and shape.

Vulcanization (for rubber materials)

Pre vulcanization: For materials such as silicone rubber that require vulcanization, the extruded sleeve needs to undergo pre vulcanization treatment to improve its physical and chemical properties.

Sulfurization: Place the pre vulcanized sleeve into a vulcanization tank or vulcanize it through a continuous vulcanization line to achieve complete curing.

Post processing

Cutting: Cut the long sleeve into the specified length as needed.

Punching/grooving: If there are special requirements, perform secondary processing such as punching or grooving.

Cleaning: Remove residues from the production process to ensure the cleanliness of the casing surface.

Inspection: Conduct various performance tests on the insulation sleeve, including electrical and physical properties, to ensure product quality.

Packaging and Shipping

Packaging: Pack according to customer requirements or standard packaging methods.

Shipment: Products that have passed quality inspection are shipped.

Quality Control Measures for Insulation Casing

The following are several important aspects of quality control in the production of silicone coated fiberglass sleeve and heat shrink tube sleeve and custom bulk silicone tubing:

1. Raw material inspection

Raw material quality: Strictly inspect the quality of incoming raw materials (such as PVC, PTFE, silicone rubber, etc.), including physical properties, chemical stability, etc., to ensure that the raw materials meet production requirements.

2. Production process control

Process parameter monitoring: Precise control of extrusion, vulcanization and other process parameters (such as temperature, pressure, speed, etc.) to ensure the stability of the production process and product consistency.

Online inspection: Set up inspection points on the production line to monitor the appearance, size, thickness, etc. of the insulation sleeve in real time, and timely detect and correct production deviations.

Equipment maintenance: Regularly maintain and calibrate production equipment to ensure its normal operation and production accuracy.

3. Finished product inspection

Physical performance testing: Conduct physical performance tests on the finished product, such as tensile strength, elongation, and bending performance, to ensure compliance with design requirements.

Electrical performance testing: Conduct insulation strength, voltage withstand tests, etc. to verify the electrical performance of the insulation sleeve.

Environmental adaptability testing: Conduct high and low temperature tests, humidity and heat aging tests on insulation sleeves to evaluate their performance stability under different environmental conditions.

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