Permabond MS359 Grey & Clear MS Polymer Medium Set 10 - 20 min Cartridge (Non-Sag) and Starter Kits

Product Name: Permabond MS359 Grey & Clear MS Polymer Medium Set 10 - 20 min Cartridge (Non-Sag)

Permabond MS359 is a single-part, high-viscosity MS polymer adhesive designed for structural bonding and sealing applications where a non-sag consistency is required. Unlike its self-leveling counterpart (MS359A), this paste-like formula stays in place on vertical or overhead surfaces without running, making it ideal for gap filling and positioning parts. It cures via ambient moisture to form a tough, permanently flexible bond that offers exceptional resistance to weathering and UV exposure.

Popular Applications & Uses
- Vertical bonding of panels, signs, and facias in construction.
- Sealing joints and seams in transportation vehicles (buses, trains, trucks).
- Bonding glass and glazing where a clear, non-yellowing aesthetic is needed (Clear version).
- General industrial assembly where parts cannot be easily clamped or are vertical.
- Gap filling in uneven or mismatched assemblies.

Industries that Commonly Use It
- Construction and Architecture
- Transportation (Specialty Vehicles, Rail, Marine)
- Signage and Display
- General Industrial Manufacturing
- HVAC (Sealing ductwork)

Special and Unique Features
- Non-sag (thixotropic) paste consistency allows for vertical and overhead application.
- Excellent resistance to UV light and weathering, making it suitable for exterior use.
- Primer-free adhesion to a wide variety of substrates, including metals, glass, and composites.
- Remains flexible to accommodate thermal expansion and vibration.
- Free from isocyanates and silicones; can be painted over after curing.

Key Properties
- Base: MS Polymer (Modified Silane)
- Color: Available in Grey and Clear
- Viscosity: High / Paste (Non-Sag)
- Skin/Set Time: 10 - 20 minutes
- Hardness: ~50-60 Shore A (Flexible)
- Elongation: High (accommodates movement)

Materials Bonded
- Metals (Aluminum, Steel, Zinc)
- Glass and Ceramics
- Composite materials (GRP, FRP, Carbon Fiber)
- Wood and many plastics
- Painted surfaces

Cure Information
- Cure Mechanism: Moisture Cure (reacts with humidity in the air).
- Skin Over Time: 10 - 20 minutes.
- Handling Strength: Approximately 1 - 2 hours (dependent on humidity).
- Full Cure: 24 hours (rate is typically 2-3mm depth per 24 hours).

Known backups / known substitutes for this product
- Sikaflex 521 UV (Weather resistant MS Polymer)
- Loctite Teroson MS 939 (Industrial MS Polymer)

Comparison Note
- The critical difference between Permabond MS359 and MS359A is viscosity. MS359 is a non-sag paste designed for vertical surfaces and gap filling where the adhesive needs to hold its shape. MS359A is a flowable, self-leveling liquid designed to spread out and coat horizontal surfaces. Both offer similar weather resistance and flexibility, so the choice depends entirely on whether you need the adhesive to flow (A) or stay put (Non-Sag).