ISO 12215-4:2002

Overview

ISO 12215-4:2002 - Small craft: Hull construction and scantlings - Part 4: Workshop and manufacturing specifies workshop conditions, material storage and handling, and manufacturing requirements for small craft with hull length (LH) up to 24 m (per ISO 8666). It is focused on production quality that affects short- and long-term mechanical properties of the hull and supports the scantling determinations used in ISO 12215-5. This part does not cover health and safety requirements.

Key topics and technical requirements

• Workshop environment
  • Controlled temperature and relative humidity per material/resin manufacturer; materials must be conditioned to workshop temperature.
  • Ventilation design to limit monomer fumes without chilling mould surfaces or causing excessive resin evaporation.
  • Dust control and appropriate illumination (avoid effects on resin cure).
• Material storage & handling
  • Procedures for receipt, verification (certificates), identification and traceability of materials.
  • Storage per manufacturer instructions (resins, catalysts/accelerators, fillers, reinforcements, core materials); avoid returning unused resin to bulk stock.
  • Use materials in order of receipt and do not use beyond expiry for structural parts.
• FRP (fibre‑reinforced plastics) production
  • Mould construction, cleaning and release-agent compatibility (silicone-containing agents prohibited).
  • Resin preparation, blending and testing when modified outside manufacturer specs.
  • Laminating processes: manual lay-up, spray lay-up (guidance including typical maximum glass deposition - generally not more than 1 150 g/m² unless validated), closed moulding, pre‑preg handling and cure schedules.
  • Surface coating and gelcoat application timing and protection against UV/hydrolytic attack.
  • Sandwich construction practices for female and male moulds, core bonding, filling of voids and curing considerations.
• Metal craft production (steel & aluminium)
  • Identification, marking, storage and documentation of plates and profiles; procedures for non‑conforming materials.
• Quality & final assurance
  • Qualification of personnel, final inspection routines and conformity assurance procedures with documented records.

Applications and who uses it

• Primary users:
  • Small craft boat builders and yards (composite, aluminium, steel, wooden production lines).
  • Production engineers and workshop managers defining shop practices and material handling.
  • Quality managers, conformity assessors and class/inspection bodies auditing production against ISO 12215 series.
  • Designers and naval architects who rely on consistent manufacturing conditions for scantling calculations (ISO 12215-5).
• Practical benefits:
  • Ensures reproducible material properties and structural performance.
  • Reduces risk of degraded laminates or improper bonding/curing.
  • Provides traceability and documented procedures for certification and regulatory review.

Related standards

• ISO 12215 (general series) - Parts 1 to 6 (Materials, sandwich cores, design pressures/scantlings, structural arrangements).
• ISO 12215-1:2000 (thermosetting resins, glass-fibre reference laminate)
• ISO 12215-3:2002 (steel, aluminium alloys, wood)
• ISO 8666 (Small craft - Principal data)

Keywords: ISO 12215-4:2002, small craft, hull construction and scantlings, workshop manufacturing, FRP boat production, resin storage, mould preparation, sandwich construction, conformity assurance.