Direct Factory Supply · Model WS-1838

WS 1838 Aluminum Window Corner Joint Adhesive

1-component moisture-curing polyurethane corner joint adhesive engineered for aluminum architectural windows, doors, and curtain wall transom miters. Micro-foaming expansion seals 45° internal chambers against water infiltration.

≥ 7.5 N/mm
D1 Shear Strength

≥ 4.5 N/mm
D4 Shear Strength

Micro-Foam
Cavity Sealing

45° Miter
Window Crimping

Chat on WhatsApp

Verified Laboratory Properties

WS-1838 Engineering Performance Parameters

Fully tested according to international ISO, ASTM, and EN test protocols. Batch COA provided with every shipment.

Parameter	Test Method	Performance Value	Engineering Relevance
Chemical Base	Polyurethane	1-Component Moisture Curing	Solvent-free, reacts with profile cavity moisture
Shear Strength (Wood)	EN 204-D1	≥ 7.5 N/mm (Std ≥5.0 N/mm)	High mechanical resistance against joint racking
Water Resistance (Wood)	EN 204-D4	≥ 4.5 N/mm (Std ≥4.0 N/mm)	High weatherproofing for timber-aluminum composite windows
Cavity Expansion	Internal Test	Controlled Micro-Foaming	Expands slightly to fill internal hollow profile voids
Open Time (20℃)	Internal Lab	10 – 15 minutes	Optimized for automated corner crimping lines
Initial Handling Strength	Clamp Test	30 – 45 minutes	Allows frame handling and glazing without joint shifting
Shore D Hardness	ISO 868	60 ± 5 D	Rigid mechanical lock preventing miter misalignment

📋 Full Technical Datasheet (TDS) and MSDS/SDS available in PDF.

Download WS-1838 TDS
WhatsApp Chemist

Why 45° Aluminum Corner Joints Leak Without WS 1838

Mechanical corner crimping alone leaves microscopic capillary gaps between the aluminum profiles. Under wind-driven rain, capillary suction pulls rainwater directly through the miter into interior walls.

WS 1838 Micro-Foaming Action: Injected into the corner cleat before crimping, WS 1838 expands slightly during curing, 100% sealing internal hollow chambers while bonding the metal cleat with high shear strength.

High-End Fenestration Fabrication

Where & How WS-1838 Corner Joint Adhesive Performs

Engineered for high-precision aluminum alloy window and door corner crimping, thermal break profiles, and structural reinforcement preventing 45° miter joint leakage.

Corner Cleat Injection

Automated 45° Miter Joint Injection

Injected into aluminum window profile cavities around the corner cleat prior to mechanical crimping or screw locking for 100% airtight framing.

Thixotropic pasty consistency prevents dripping
Initial setting: 30-45 minutes; full cure: 24 hours

Corner Joint Micro-Foaming Cavity Filling Cross Section

Micro-Foaming Expansion

Micro-Foaming Cavity Void Filling

Controlled 5-10% micro-expansion during curing forces adhesive into tiny micro-clearances between the corner cleat and extruded aluminum walls.

Eliminates internal void spaces and rattling
Prevents rainwater infiltration under 1000 Pa wind pressure

Corner Joint Shear Strength Testing Demonstration

12.5 MPa Shear Strength

Certified Aluminum Shear Resistance

One-component solvent-free polyurethane forms an ultra-rigid thermoset structural bond with sandblasted, anodized, and powder-coated aluminum alloy.

Tensile shear strength on aluminum: ≥ 12.0 MPa
Shore D Hardness: 75 ± 5

Finished High-End Aluminum Window Frame Corner Inspection

QC Finished Window

Thermal Break Profiles & Passive House

Critical component in high-performance system windows and Passive House fenestration requiring airtightness class 4 and watertightness class 9A.

Resists high temperature baking and powder coating cycles
Solvent-free, zero isocyanate vapor hazard in shop

Fabricating System Windows or Curtain Wall Framing?

Request a technical consultation and test cartridge of WS-1838 along with specialized injection nozzles for your extrusion profiles.

Export Logistics & Packaging

Packaging Specifications & Container Freight

Precision aluminum metal cartridges hermetically sealed with silica desiccant caps to protect polyurethane reactivity across ocean shipping.

WS-1838 Aluminum Cartridge Packaging with Moisture Barrier

Metal Cartridge Barrier Format

Supplied in 310 ml rigid aluminum cartridges with airtight bottom plugs (12 pcs or 24 pcs/ctn) and 600 ml sausages for pneumatic factory guns.

CHEMPU Automated Cartridge Filling and Packaging Lines

Automated Factory Packaging & Export Pallets

Precision automated nitrogen-blanketed filling ensures zero moisture intrusion, packed on ISPM-15 fumigated solid wood export pallets.

20GP Full Container Loading (FCL) Matrix

Specification	Units/Ctn	20GP Container
310 ml Aluminum Cartridge	24 pcs	1,900 ctns (45,600 pcs)
600 ml Foil Sausage	20 pcs	1,200 ctns (24,000 pcs)
25 kg Industrial Pail	1 pail	800 pails (20,000 kg)

WhatsApp RFQ

🏷️ System Window OEM Partnerships

Specialized OEM supply for window system brands, aluminum extrusion extruders, and fabrication franchises:

Customized Cartridge Graphics: Full metal offset printing with system brand logos and instructions.
Injection Gun & Nozzle Kits: Extended metal nozzles and 45° angled injection needles available.
Reactivity Adjustment: Open time customized from 20 to 60 minutes for different assembly line speeds.
Shipping Compliance: Non-hazardous chemical classification for convenient sea container freight.

Storage & Life: 12 months at +10°C to +25°C in unopened original aluminum cartridges.