DELO-PUR Two-Part Polyurethane Adhesives

Flexible Structural Bonding and Impact-Resistant Applications

DELO-PUR polyurethane adhesives are specified in structural bonding applications where a cold-cure flexible bond is required alongside impact resistance and accommodation of differential thermal movement between dissimilar substrates.

For bonding assemblies where substrates have different coefficients of thermal expansion, such as metal-to-plastic or composite-to-metal joints, DELO-PUR accommodates repeated thermal cycling without the cracking that rigid epoxy systems experience. The tough, elastic cured material distributes stress across the full bond area throughout the service life of the assembly.

In applications subject to impact, shock or sustained vibration, DELO-PUR polyurethane adhesives absorb energy through the flexibility of the cured bond line, making them suited to ultra-fast deceleration applications and assemblies in industrial equipment, automotive electronics and mechanical engineering where dynamic loading is a primary design consideration.

DELO-PUR adhesives also secure precision mechanical components and printed circuit board assemblies, where the adhesive takes on a structural role within the assembly and contributes to overall structural integrity. The range can be applied in any layer thickness and functions as a construction-carrying element.

Key characteristics include:

• Flexible bond line accommodating differential thermal movement between dissimilar materials
• Energy absorption under impact and dynamic loading without transmitting stress to substrates
• Very high impact resistance for ultra-fast deceleration and shock applications
• Structural integrity contribution in precision mechanical assemblies
• Cure in any layer thickness supporting design flexibility

How Polyurethane Adhesives Work in Bonding and Potting

Manufacturers use polyurethane adhesives when they require flexible structural bonds that accommodate thermal movement, impact resistance, or potting applications where rigid cured materials would transmit stress to sensitive components or crack under dynamic loading.

DELO-PUR cures through a chemical reaction between resin and hardener that begins on mixing at room temperature. No UV lamp, heat source or specific substrate is required to trigger polymerisation. Initial handling strength of 1 to 2 MPa develops within 10 minutes, allowing partial handling and repositioning before full cure. Full strength of up to 20 MPa develops after 24 hours at room temperature, with heat available to accelerate the cure process where production cycle times require it.

The cured polyurethane structure combines structural bond strength with a degree of elasticity. This flexibility allows the bond line to absorb mechanical movement, vibration and impact loading without cracking or delaminating from the substrate. Mineral-filled formulations with high run-resistance support gap-filling in large or uneven joint geometries.

Key characteristics include:

• Room temperature polymerisation triggered by mixing, with no external energy source required
• Flexible cured structure combining structural strength with elasticity
• Initial handling strength within 10 minutes supporting partial handling and repositioning
• Full strength development after 24 hours, accelerable by applied heat
• Energy absorption through bond line flexibility rather than rigid structure

Where can I buy DELO-PUR polyurethane adhesives in the UK?

Inseto is the authorised distributor for the full DELO-PUR range across the UK and Ireland. Call +44 (0)1264 334505 or use the enquiry form on this page to request a sample, datasheet or quote.

How do DELO-PUR polyurethane adhesives cure?

DELO-PUR adhesives cure through a chemical reaction between resin and hardener that begins when they are mixed together at room temperature. No UV lamp, heat source or specific substrate is required to trigger polymerisation. Elevated temperature can be used to accelerate cure where production cycle times require it.

How quickly do DELO-PUR adhesives reach handling strength?

DELO-PUR adhesives reach an initial handling strength of 1 to 2 MPa within 10 minutes of mixing at room temperature. Full cure strength of up to 20 MPa develops after 24 hours. Cure speed can be accelerated significantly by applying heat after initial mixing and dispensing.

What formats is DELO-PUR available in?

DELO-PUR adhesives are available in 50ml and 200ml DELO Side-by-Side double cartridges for use with manual and pneumatic dispensing guns, and in 25kg part A and B drums for high-volume production environments. The 1:1 mixing ratio across the range supports consistent results in both manual and automated dispensing applications.

Does Inseto provide technical support?

Inseto provides technical support, product documentation and samples for the full DELO-PUR range. Inseto can advise on grade selection, gap-filling requirements, cure acceleration and compatible dispensing equipment for your specific application. Call +44 (0)1264 334505 or send an enquiry using the form on this page.