Foil Disc: diameter 3.0-10.0 mm, thickness 0.05-0.15 mm

Component Specifications

Definition

A foil disc is a critical component in precision percussion primer assemblies, typically made from thin metal foil (0.05-0.15mm thickness). It serves as a deformable barrier that, when struck by a firing pin, undergoes plastic deformation to initiate a chemical reaction in the primer compound. This component must maintain precise dimensional tolerances and material properties to ensure consistent ignition timing and reliability in industrial percussion systems.

Working Principle

The foil disc operates on the principle of controlled plastic deformation under impact. When the firing pin strikes the disc, the metal foil deforms rapidly, creating localized pressure and friction that ignites the sensitive primer compound beneath it. The disc's thickness, material properties, and surface characteristics determine the energy transfer efficiency and ignition reliability.

Materials

Typically made from annealed aluminum foil (1100 or 3003 series) or copper foil (C11000), with thickness ranging from 0.05mm to 0.15mm. Some applications use nickel-plated steel foil for enhanced durability. Material must have consistent grain structure and controlled hardness (typically 30-50 HV for aluminum, 60-80 HV for copper).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	3.0-10.0 mm
Hardness	30-80 HV
Thickness	0.05-0.15 mm
Burst Pressure	15-45 MPa
Surface Roughness	Ra ≤ 0.8 μm
Flatness Tolerance	±0.01 mm

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, ISO/TS 16949, DIN 8580, ASTM B479

Engineering Analysis

Risks & Mitigation

Material fatigue from repeated impacts
Corrosion affecting ignition reliability
Dimensional variation causing misfires
Contamination from handling or storage

FMEA Triads

Trigger: Material inconsistency or impurities
Failure: Inconsistent deformation leading to misfires or delayed ignition
Mitigation: Implement strict material certification and batch testing protocols

Trigger: Improper storage conditions (humidity, temperature)
Failure: Corrosion or material degradation affecting performance
Mitigation: Use controlled environment storage with desiccants and temperature monitoring

Trigger: Manufacturing dimensional variations
Failure: Poor fit in primer assembly causing energy loss
Mitigation: Implement statistical process control with 100% dimensional inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter: ±0.02mm, Thickness: ±0.005mm, Flatness: 0.01mm TIR

Test Method

ISO 527-2 for tensile properties, ASTM E384 for hardness, ASTM B487 for coating thickness, functional testing with calibrated impact testers

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 Foil Disc

Manufacturer profiles associated with Foil Disc.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a foil disc in percussion primer assemblies?

The foil disc serves as a deformable barrier that, when struck by a firing pin, undergoes plastic deformation to create localized pressure and friction, thereby igniting the primer compound for reliable initiation.

Why is material selection critical for foil discs?

Material selection determines deformation characteristics, energy transfer efficiency, corrosion resistance, and compatibility with primer chemicals. Different materials (aluminum, copper, nickel-plated steel) offer varying balances of cost, performance, and environmental resistance.

How does foil disc thickness affect percussion system performance?

Thickness directly influences ignition sensitivity and reliability. Thinner discs require less impact energy but may be more prone to premature deformation, while thicker discs provide better durability but require higher impact forces.

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.

Foil Disc