report_problem Problem Statement
Cross-laminated timber (CLT) is the fastest-growing structural building material, enabling mass timber buildings up to 25 stories that sequester carbon. However, CLT manufacturing relies on one-component polyurethane (1K PUR) adhesives derived from toxic methylene diphenyl diisocyanate (MDI). MDI is a potent respiratory sensitizer — once sensitized, even trace exposure can trigger fatal asthma attacks. Workers in CLT plants face chronic MDI exposure, and fire or machining of cured CLT releases isocyanate decomposition products.
trending_up Market Size
$1.6B global structural wood adhesives market (CLT segment growing 14% CAGR)
gavel Regulatory Drivers
OSHA PEL for MDI at 0.02 ppm ceiling. EU REACH Authorization required for diisocyanates in industrial use (effective August 2023, Regulation 2020/1149) — all workers handling diisocyanates must complete certified training. EN 16351 (CLT standard) specifies adhesive performance requirements. ANSI/APA PRG 320 (CLT Performance Standard) in North America. ICC-ES ESR reports for building code compliance. EPD (Environmental Product Declaration) and LCA requirements increasingly scrutinize adhesive embodied carbon.
corporate_fare Enterprise Interest
No enterprise interest recorded yet. Companies can indicate their volume and urgency to help guide research priorities.
flag Success Criteria
Block shear strength above 6 MPa (dry) per EN 302-1, with wood failure above 70%. Wet shear strength above 4 MPa after 72hr cold water soak. Pass EN 391 delamination test (total delamination <5% for use class 1). Creep deformation under sustained load comparable to PUR adhesive controls. Open and closed assembly times compatible with industrial CLT manufacturing (minimum 30-minute open time).
precision_manufacturing Equipment Needed
Hydraulic cold press (minimum 1 MPa, 400mm platens) or laboratory hot press, SPF lumber (kiln-dried, 12% MC), soy protein isolate (food-grade), adhesive mixing equipment, table saw or precision specimen cutter, universal testing machine (100 kN capacity minimum for structural shear testing), vacuum-pressure delamination test apparatus (EN 391), water bath, analytical balance, moisture meter, calipers, specimen marking and cutting templates
menu_book Existing References
Reference list will be published with protocols.
Protected Research Content
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