Overview
ISO 10033-1:2011 specifies standardized test methods for assessing the bonding quality of Laminated Veneer Lumber (LVL) bonded with thermosetting resin. It defines sampling, specimen dimensions, required apparatus, pre-treatment cycles, test procedures and reporting rules used to quantify delamination and evaluate glueline performance. The document is Part 1 of the ISO 10033 series and is intended to support consistent laboratory and production control testing of LVL bond integrity.
Key topics and technical requirements
- Scope: Methods for determining bonding quality of LVL bonded with thermosetting resin; alternative correlated methods may be used if validated.
- Test pieces: Standard specimen is a square of (75 ± 1) mm × (75 ± 1) mm and full LVL thickness (shorter widths allowed if sample is narrow).
- Apparatus: Typical equipment includes temperature-controlled water bath, boiling tank, ventilated drying oven, vacuum-pressure chamber (85 kPa vacuum → 465 ± 15 kPa pressure), and autoclave (steam at 200 ± 7 kPa).
- Pre-treatment cycles: Defined conditioning protocols include 24 h cold soak, 6 h boil, BDB (boil-dry-boil), vacuum-pressure (VP), 72 h boil, steam treatment, and a 70 °C hot water soak (not applicable to some annex tests). Selection depends on bonding class (see ISO 10033-2).
- Post-treatment specimen conditioning: Drying regimes vary by bonding class (e.g., 60 °C or 70 °C for 24 h; bonding class 3 requires two pre-treatment cycles with drying after each).
- Delamination measurement: Measure delamination length on four sides of the specimen; ignore delamination
