ISO 19095-3:2015

Overview

ISO 19095-3:2015 specifies standardized test methods for evaluating the adhesion interface performance in plastic‑metal assemblies. It is Part 3 of the ISO 19095 series and focuses on practical, repeatable mechanical and sealing tests to characterize how well plastics bond to metals under controlled specimen conditioning and test conditions. The standard is intended to improve traceability and comparability of interface performance data used in safety‑critical sectors such as automotive and aerospace.

Key topics and requirements

• Scope and conditioning

  • Applies to test methods for the plastic‑metal adhesion interface; specimen conditioning follows ISO 19095‑1.
  • Specimens must be free from twist, surface defects and have mutually perpendicular parallel surfaces; nonconforming specimens are rejected or machined.

• Mechanical test methods included

  • Tensile strength: machine capacity selected so rupture occurs between 10% and 80% full scale; recorded force accuracy within 1%; typical crosshead speed 10 mm/min; breaking stress = breaking load / joint area (MPa).
  • Tensile lap‑shear strength: uses tensile machine plus specimen retainer; retainer design minimizes friction (metal grip gap ≈ specimen + 0.1 mm; plastic grip gap < 0.1 mm).
  • Peel strength, bending strength, impact strength: procedures reference apparatus, specimen geometry, test speed and expression of results consistent with mechanical evaluation needs.
  • Sealing properties: dedicated procedures defined, with normative Annexes describing the spray method and bell‑jar method for leak/sealing evaluation.

• Apparatus and measurement

  • Tensile machines must maintain constant speeds (10 mm/min) or constant loading rate (8.3–9.7 MPa/min) and be fitted with self‑aligning grips to avoid off‑axis loading.
  • Test atmosphere should match conditioning unless otherwise agreed.

• Reporting

  • Test reports must include method‑specific data (e.g., breaking stress averages, specimen details, conditioning, failure mode).

Applications and users

• Practical for automotive, aerospace, electronics, and industrial manufacturers who join plastics to metals.
• Used by materials engineers, test laboratories, OEM suppliers, R&D teams, and quality assurance departments to:
  • Validate adhesive/bonding processes
  • Compare materials, surface treatments, and joining methods
  • Support failure analysis and design verification for safety‑critical assemblies

Related standards

• ISO 19095‑1: Guidelines for the approach
• ISO 19095‑2: Test specimens
• ISO 19095‑4: Environmental conditions for durability
• ISO 8256, ISO 14125 (referenced mechanical test standards)
• IEC 60068‑2‑17 (sealing test reference)

Keywords: ISO 19095-3, plastic-metal assemblies, adhesion interface, test methods, tensile strength, lap-shear, peel strength, sealing properties, materials testing.