Metal Sheath/Casing: Diameter Range 6mm to 50mm

Component Specifications

Definition

A metal sheath or casing is a critical component of industrial heater bands, designed as a cylindrical or flat protective enclosure that surrounds the heating element. It serves multiple functions: providing mechanical protection against physical damage and environmental factors, containing thermal energy for efficient heat transfer, ensuring electrical insulation and grounding safety, and often acting as a heat spreader for uniform temperature distribution. These casings are engineered to withstand high temperatures, corrosive environments, and mechanical stress while maintaining structural integrity.

Working Principle

The metal sheath/casing operates by enclosing the heating element (typically resistance wires or ceramic cores) to contain and direct thermal energy. It transfers heat from the internal element to the target surface through conduction while protecting the element from external damage. The casing often includes insulation materials (like magnesium oxide) to prevent electrical shorts and improve thermal efficiency. Its design ensures even heat distribution across the surface and provides a safe, grounded exterior for handling.

Materials

Stainless steel (AISI 304, 316 for corrosion resistance), Inconel (for high-temperature applications up to 1200°C), carbon steel (for general-purpose use), aluminum (for lightweight applications), with optional coatings like nickel plating for enhanced durability. Insulation typically uses compressed magnesium oxide powder.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter Range	6mm to 50mm
Surface Finish	Ra 0.8μm to 3.2μm
Wall Thickness	0.5mm to 2.0mm
Pressure Rating	Up to 300 bar
Length Tolerance	±1mm per 100mm
Temperature Range	-50°C to 1200°C
Electrical Resistance	>100 MΩ at 500VDC

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, DIN 44870, IEC 60079, ATEX Directive 2014/34/EU

Parent Products

This component is used in the following industrial products

Heater Bands

Cylindrical electrical heating elements that encircle the barrel of an injection molding machine to melt plastic pellets.

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Engineering Analysis

Risks & Mitigation

Thermal expansion causing cracks
Corrosion in humid/chemical environments
Electrical short circuits if insulation fails
Mechanical deformation under high pressure

FMEA Triads

Trigger: Inadequate material selection for high-temperature operation
Failure: Casing deformation or rupture
Mitigation: Use high-temperature alloys like Inconel and conduct thermal stress analysis during design.

Trigger: Poor sealing at endpoints
Failure: Moisture ingress leading to electrical failure
Mitigation: Implement welded or crimped seals with moisture-resistant insulation materials.

Trigger: Insufficient wall thickness for mechanical load
Failure: Casing collapse under pressure
Mitigation: Design with safety factors and validate through pressure testing per ISO standards.

Industrial Ecosystem

Compatible With

Industrial heaters, extrusion barrels, injection molding machines, packaging equipment, chemical reactors

Typical Suppliers & Equivalents

Watlow, Chromalox, Tempeo, Backer, Hotwatt

Compliance & Inspection

Tolerance

Diameter: ±0.1mm, Length: ±0.5%, Wall thickness: ±10%

Test Method

Pressure testing per ISO 11439, thermal cycling per IEC 60068-2-14, electrical insulation resistance testing per IEC 60243

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Metal Sheath/Casing

Manufacturer profiles associated with Metal Sheath/Casing.

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Frequently Asked Questions

What is the primary function of a metal sheath in heater bands?

The primary function is to protect the internal heating element from mechanical damage, provide electrical insulation, ensure safe handling, and optimize heat transfer to the target surface.

How do I select the right material for a heater band casing?

Select based on operating temperature, environmental conditions (e.g., corrosive atmospheres), mechanical stress requirements, and compliance standards. Stainless steel is common for general use, while Inconel suits extreme temperatures.

Can metal sheaths be customized for specific applications?

Yes, they can be customized in diameter, length, wall thickness, material, and surface finish to match specific thermal, mechanical, and environmental requirements.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Metal Sheath/Casing