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Adheseal PU-50FC polyurethane adhesive sealant sausage tube for structural bonding and anti-pick joint sealing.
Adheseal PU-50FC polyurethane adhesive sealant sausage tube for structural bonding and anti-pick joint sealing.

Adheseal PU50 Polyurethane Sealant

A high-modulus polyurethane for anti-pick joints and heavy-duty structural bonding. Tough enough for public buildings, flexible enough for joints that move and vibrate.

Vendor: Adheseal
SKU: PU50GR/SSG
Availability: In Stock
$14.96
$14.96
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Description  

PU50 is a high-modulus polyurethane sealant and adhesive for demanding construction joints and flexible bonding where toughness and movement resistance matter. Its Shore A 45 hardness makes it particularly suited to anti-pick public-area joints, while +/- 25% movement capability accommodates expansion and vibration-prone applications.

Common Questions  

Where does an anti-pick sealant make sense?
PU50's Shore A 45 hardness resists picking and abrasion, which suits schools, public buildings, and other high-traffic joints.

Can PU50 go below the waterline?
Yes, once it is fully cured. It also takes constant movement and vibration, which suits marine work.

Why can I not use it in a closed space?
It cures by reacting with moisture in the air. In a totally confined space it will not cure properly.

Can I paint over PU50?
Yes, once cured, with acrylic, oil, or rubber-based paints. Non-flexible paints may crack under joint movement.

Does PU50 need a primer?
Often no, but roughened non-porous surfaces take Adheseal 50A and porous surfaces take Everflex Supaprime. Always run an adhesion test first.

Uses & Benefits  
Shore A 45 hardness suits anti-pick joints in schools, prisons, and other public buildings. Tough, tear-resistant bond takes up to +/- 25% joint movement and constant vibration. Bonds panels and facades and suits civil joints; below-waterline use once fully cured. Resists mould and mildew in hot, humid service conditions, and is paintable with flexible paints.
How To Apply  
Prepare dry, clean, sound joints and prime where needed: Adheseal 50A on roughened non-porous surfaces, Everflex Supaprime on porous surfaces. Push the sealant firmly into the joint and tool it with a moistened spatula before it skins. Design joints to a 2:1 width-to-depth ratio, minimum 5 mm internal and 10 mm external, and use a closed-cell backing rod 25% larger than the joint where it is deeper than 10 mm. Clean wet excess off with xylene, and remove cured sealant mechanically.
Limitations and Safety Info  
Do not use it in internal swimming pools, and avoid high chlorine levels. Do not use it in totally confined spaces; it needs atmospheric humidity to cure. Not for aquariums. Not for structural glazing; use Adheseal N-80 or N-60 glazing silicone. Not for mirrors; use Adheseal High Power 609, and test first. Not for bitumen, natural rubber, EPDM, or materials that leach oils, plasticisers, or solvents. It can discolour copper and brass; test lead and copper first, and stain-test natural stone. Composite panels need testing first. Do not apply where moisture vapour comes off the substrate; it can bubble. Keep uncured sealant away from cleaning agents, solvents, and alcohol. Apply between +5°C and +35°C.
Suitable Substrates  
  • Suits: Concrete, masonry, brick, stone, timber, metals including stainless steel, aluminium, and galvanised steel, plastics, fibreglass, porcelain, painted surfaces, powder-coated profiles, and waterproof membranes.
  • Rubber: Compatibility dependent. Not natural rubber or EPDM.
  • Non-porous: Slightly roughen, clean with the two-wipe method, then pre-treat with Adheseal 50A and wait 30 minutes to 2 hours.
  • Porous: Prime with Everflex Supaprime and wait 30 minutes to 2 hours.
  • Concrete: Cure for at least 28 days first.
  • Always: Do an adhesion test before full application.

Adheseal PU50 Polyurethane Sealant Physical Properties

Adheseal PU50 Polyurethane Sealant Physical Properties
Property Value
Product Type Polyurethane
Curing System Moisture
Cure Rate 3mm per 24 hours
Density Black: 1.15; Others: 1.16 ± 0.02
Shore A Hardness 45
Movement Capability +/- 25%
Tensile Strength 12 N/mm
Elongation >700%
Modulus 0.8 MPa @ 100%
Application Temperature +5°C to +35°C
Service Temperature -40ºC to +90ºC
Pot Life 25 minutes @ 23ºC & 50% RH
Skin Time 60 minutes @ 23ºC & 50% RH
VOC Content 95 gm/lt
Shelf Life 12 months
Storage Temperature 10ºC to 35ºC
UV Resistance Good
Chemical Resistance Excellent for water, detergent solutions, moderately diluted acids & alkalis, petrol & oil for short periods
Full Cure 3mm / 24Hours
Specific Gravity Black: 1.15. Others: 1.16±0.02
Storage Conditions Cool Dry between 10ºC and 35ºC
Tear Strength 12N/mm

Adheseal PU50 Polyurethane Sealant - Use Cases

Here are some common examples on where Adheseal PU50 Polyurethane Sealant used by our customers.

Anti-Pick Public Area Sealing

Sealing joints or perimeters in public buildings, schools, or prisons where tampering and vandalism are concerns.

Its high Shore A 45 hardness and superior tear resistance create a tough, anti-pick seal, deterring removal and ensuring long-term durability.

  • Shore A 45 hardness
  • Tear strength 12 N/mm
  • Public buildings
  • Prisons

Civil Construction

Sealing Submerged Concrete Joints

Concrete expansion joints continuously submerged or subject to hydrostatic pressure below the water table.

Designed for permanent immersion, its high modulus and adhesion prevent water ingress, ensuring lasting integrity in wet environments.

  • Suitable for below-waterline applications
  • Shore A 45 hardness after 14 days
  • Joint movement capability +/- 25%
  • Excellent chemical resistance to water

Marine

Vehicular & Marine Structural Bonds

Bonding components in transport (trucks, caravans, boats) needing high-strength, flexible joints resistant to vibration.

Provides a robust, flexible structural bond that withstands constant movement and extreme temperatures, ensuring component integrity.

  • Flexible Structural Bond
  • Modulus 0.8 MPa @ 100%
  • Elongation to break >700%
  • Service temp -40°C to +90°C

Caravan & Truck

Flexible Structural Panel Bonding

Bonding XPS foam core panels, curtain walls, or vehicular components subject to constant movement and vibration.

Delivers a high-strength, flexible structural bond with impressive elasticity, accommodating dynamic loads in demanding manufacturing environments.

  • Flexible Structural Bond
  • Elongation >700%
  • Modulus 0.8 MPa
  • Vehicular manufacturing

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