ISO 18775:2020 PDF

Overview

ISO 18775:2020 - "Veneers - Terms and definitions, determination of physical characteristics and tolerances" is an international standard published by ISO that establishes standardized terms and definitions for wood veneers and specifies methods to determine key physical characteristics and dimensional tolerances. It covers veneers produced by slicing, rotary cutting or sawing, and applies to natural, treated and multilaminar veneers; however, specific additional requirements for treated, multilaminar and laminated wood veneers are not included.

Key topics and technical requirements

• Standard vocabulary: Comprehensive terms and definitions relating to veneers, production methods, visual figures, features, defects and repairs (e.g., sliced veneer, rotary cut veneer, flitch, bundle, matching methods).
• Production methods: Definitions and schematics for slicing, rotary cutting, sawing and quarter/half cutting variations used in veneer manufacture.
• Physical testing procedures:
  • Moisture content - principle, preparation of test pieces, test procedure and reporting of results.
  • Density - referenced method for veneer/wood-based panels.
  • Dimensions and squareness - procedures to measure length, width, thickness and squareness, including how to express results.
  • Test reporting - required contents of test reports for physical characteristic determinations.
• Dimensional tolerances:
  • Defines a reference moisture content for dimensional checks.
  • Provides tolerances for length, width and thickness of veneers (measurement rules and application).
• Visual and matching terminology: Terms for grain figures (crown, bird’s eye, fiddleback), matching techniques (book matching, butt matching) and defects/features descriptions.
• Informative annexes: Illustrative schemes for production and matching methods to assist implementation.

Practical applications and users

ISO 18775 is essential for:

• Veneer and plywood manufacturers - for consistent production tolerances and test methods.
• Quality control and testing laboratories - to perform and report moisture, density and dimensional tests consistently.
• Furniture, cabinetry and joinery industries - to specify veneer appearance (matching) and acceptable dimensional tolerances.
• Procurement/specification writers, architects and product designers - to reference standardized veneer definitions and tolerances in contracts and drawings.
• Importers/exporters and inspectors - to harmonize acceptance criteria and reduce trade disputes over veneer quality.

Keywords: ISO 18775, veneers, wood veneers, veneer tolerances, veneer thickness, veneer dimensions, moisture content, rotary cut, sliced veneer, sawn veneer, veneer matching.

Related standards

• ISO 9427 - Determination of density (wood-based panels)
• ISO 16999 - Sampling and cutting of test pieces
• ISO 24294 - Timber vocabulary (used for referenced terms)