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Foil Disc Component – Machinery and Equipment Manufacturing

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

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

Standards

ISO 9001, ISO/TS 16949, DIN 8580, ASTM B479

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Foil Disc.

Parent Products

This component is used in the following industrial products

Precision Percussion Primer Assembly

Miniature explosive ignition component for ammunition cartridges.

View Product Details

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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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