Crestafix® B72R
BONDING PASTE

Product info

Crestafix® B72R Bonding Paste

Polyester-Based Core Bedding Compound for Composite Sandwich Construction

Crestafix® B72R is a polyester-based, MEKP-catalysed core bedding compound developed for bonding and bedding cores in composite sandwich structures. Lightweight, highly thixotropic, and non-sagging, it is engineered to provide the controlled elasticity required at the core-to-skin interface, reducing print-through while maintaining structural integrity.

Designed for use in both hand lay-up and vacuum-bagged core installations, Crestafix® B72R delivers reliable gap-filling performance across a wide range of core thicknesses. Its low-shrink formulation ensures consistent laminate quality, even on vertical or complex surfaces.

Key Features & Benefits

Polyester-based core bedding compound

Compatible with GRP laminates and common composite construction methods

Highly thixotropic & non-sagging

Excellent control on vertical and overhead surfaces

Low density & lightweight

Minimises added weight in sandwich structures

Low shrink formulation

Reduces print-through and surface distortion

Wide gap-filling capability

Effective bonding from 1–25 mm (0.04–1.00 in)

Controlled elasticity

Optimised for durable core-to-skin interfaces

Applications

Working Time: ~55 minutes
Recommended Application Temperature: 18–25°C (64–77°F)
Gap Filling Range: 1–25 mm (0.04–1.00 in)
Colour Change: Light blue → off-white (cure indicator)
Shelf Life: 12 months (stored as recommended)

Mechanical & Thermal Properties (Cured)

Tensile Strength: ~18 MPa (2600 psi)
Tensile Modulus: ~1450 MPa (210,000 psi)
Tensile Elongation: ~2%
Lap Shear Strength (GRP): ~5 MPa (substrate failure)
Hardness: ~70 Shore D

Processing & Handling

Crestafix® B72R is supplied pre-accelerated and requires only the addition of catalyst.

Recommended catalyst: 2% Butanox® M50 (MEKP)
Mix thoroughly using a low-shear stirrer to minimise air entrapment
Apply evenly to prepared surfaces; hold bonded components in position until cured

A priming resin should be applied to the core surface prior to bedding for optimum adhesion. Additional pigments or fillers are not recommended, as they may affect cure and mechanical performance.

Packaging & Storage

Packaging: 15 kg Pail
Storage:
Store in original, unopened containers in a dry, well-ventilated area
Recommended storage temperature 2–23°C (36–77°F)
Protect from freezing and direct sunlight

Technical Data Sheet

Crestafix® B72R Bonding Paste

ATL Technical Support
ATL Composites provides core bedding selection advice, laminate system compatibility guidance, and processing support to ensure Crestafix® B72R delivers consistent performance in sandwich composite construction.

frequently asked questions

How does ATL tailor composite systems for different industries?

Every industry has distinct performance, compliance, and manufacturing requirements. ATL’s in-house chemists and engineers develop and refine epoxy systems, adhesives, and core materials to meet the specific demands of marine, defence, aerospace, automotive, industrial, civil, architectural, and sporting applications — ensuring every product delivers optimal strength, efficiency, and durability.

Can ATL customise materials for my project or process?

Yes. ATL offers custom formulation and process engineering support to align material performance with your production requirements — whether infusion, hand lay-up, lamination, bonding, or CNC-routed panel construction. Our technical team collaborates closely with customers to deliver precision-matched resin systems and structural solutions for unique applications.

Are ATL’s composite systems certified for high-performance applications?

Absolutely. ATL operates under an ISO 9001:2015-certified quality management system, with selected materials approved by DNV for use in structural and high-load applications. Every ATL system is manufactured to exacting standards of performance, consistency, and traceability to meet the demands of defence, industrial, and advanced engineering environments.

What makes ATL’s materials suitable for large-scale or structural builds?

ATL’s epoxy systems, structural panels, and composite cores are engineered for high strength-to-weight performance, dimensional stability, and fatigue resistance. These attributes make ATL materials ideal for large composite assemblies, modular structures, and precision-engineered components where long-term strength, weight reduction, and reliability are essential.

Does ATL offer sustainable or bio-based composite options?

Yes. ATL is committed to advancing sustainable composite technology, offering USDA-Certified Bio-Based epoxy systems and environmentally conscious materials that reduce waste, extend service life, and minimise environmental impact. Our ongoing R&D focuses on improving sustainability without compromising structural integrity or mechanical performance.

How can I select the right ATL system for my application?

Choosing the ideal composite system depends on your structure’s design, load requirements, manufacturing process, and environmental exposure. ATL’s in-house engineers and chemists provide tailored advice to ensure the correct combination of resin, core, adhesive, and surface technology for your project.
To discuss your application or request technical guidance, contact ATL’s Technical Team — we’ll help you identify the most effective and efficient composite solution for your build.

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