A glue line you cannot find
Edge banding and panel lamination fail on two things: a visible seam and a seam that cracks once it drinks moisture. Glue on wood edging answers both. The cured line runs under 0.1 mm, colourless, with a refractive index close to timber, so it is hard to locate without a magnifier. A Zhejiang cabinet maker tested its door panels after 48 hours of water contact and the line held with no checking.
Two-part system, matched parameters
A specially modified high-molecular PVAc emulsion is cross-linked by a hydrophilic polyisocyanate at 100:15 by weight. Base solids are 52 percent +/-2 percent on a pH of 6.0-7.0, viscosity 8,000-18,000 mPa.s at 25 C, open time 30-45 minutes. The formula carries no added formaldehyde, meets CARB, and is a common pick for JAS-market exports.
Water class and release time
To EN 204 the bond is Class D4, tested through a boil-4h, 60 C dry-16h, boil-4h cycle with strength retention above 85 percent, so bathroom vanities and outdoor pieces are covered. Shear on ASTM D-905 reaches 14-17 MPa with wood failure of 95 percent or more. At 25 C and a 15 percent spread, 45-60 minutes of pressure releases the panel, and it can be ripped, sawn or drilled after 24 hours, letting one press turn out two shifts of boards.
Support for high-moisture species
The line team has supplied export furniture makers for years and can advise on spread rate and clamp pressure, or retune the formula for high-moisture timber and edge-banding machine settings.
Where the clean line matters
The product sits on the panel end of the catalogue rather than the assembly bench. Solid-wood door skins, cabinet panels, tabletops and edge-banded boards are where a barely visible bond line sells the piece, and the D4 water class carries those faces through humid rooms and garden furniture. Export houses shipping to the Japanese JAS market already know the grade, which shortens a buyer audit. The line has run on real production floors at export furniture plants, so spread-rate and press guidance comes from applied settings, not theory.
Product Specifications
|
Parameter |
Specification |
|
Composition |
Two-part modified PVAc + polyisocyanate; mix 100:15 by weight |
|
Base solids / viscosity |
52% +/-2% solids; 8,000-18,000 mPa.s at 25 C; pH 6.0-7.0 |
|
Glue line / open time |
<0.1 mm; 30-45 min at 25 C |
|
Bond strength (ASTM D-905) |
14-17 MPa, wood failure >=95%; EN 204 D4 |
|
Clamp / work time |
45-60 min release at 25 C, 15% spread |
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