What is the relationship between Ultramarin and the historical IMGRAD Ljutomer?

Ultramarin d.o.o. is the technological successor to IMGRAD. The expertise in GRP composites and surface protection, dating back to 1950, has been significantly upgraded since then. The engineering foundation from the era of the K67 modular kiosk has been updated with modern technologies, enabling much higher precision and compliance with contemporary industrial standards.

In which regions does the Ultramarin Group operate?

The Ultramarin Group has a strong regional footprint in Central and SE Europe. Primary manufacturing and development facilities are located in Slovenia, supported by strategic subsidiary operations in Serbia and Bosnia and Herzegovina. This allows for optimized logistics and competitive manufacturing for global partners.

Which industrial sectors does Ultramarin primarily serve?

The Ultramarin Group provides vertically integrated solutions for the marine (luxury yachts and workboats), automotive (emergency and light vehicles), and agricultural machinery sectors. Specialized surface protection is also provided for the construction and architecture industries through the powder coating division.

Advanced Composites Overview

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Vertically Integrated Structural Integrity

Structural fatigue in high-performance composites is rarely the result of material choice alone; it is often the consequence of inadequate internal architecture. At Ultramarin, we mitigate the risks of delamination and structural failure by governing the entire lifecycle: from the initial CAD-driven lamination schedule to the final serial production run.

Our composites division operates as a technical partner for shipyards, automotive manufacturers, and industrial firms where structural failure is not a manageable risk. By leveraging a 70-year IMGRAD legacy, we bridge the foundational engineering of the K67 era with contemporary polymer science and automated precision.

Key Capabilities & Engineering Verticals

Structural Engineering & Tooling Optimization

We go beyond standard safety margins to fully optimize your GRP components. By defining precise Vf (Fiber Volume Fraction) and Tg (Glass Transition Temperature) targets, we ensure every component is engineered for its specific environment.

Smart Lamination
Development of precise ply-books to manage load paths and eliminate unnecessary weight.
Tooling Design
In-house production of high-stability molds designed for thermal cycling and strict dimensional accuracy over long production cycles.

Advanced Manufacturing & Resin Management

Our facilities are optimized for Vacuum Infusion (VIP) and Resin Transfer Molding (RTM)—processes that prioritize mechanical strength and consistency. By controlling the resin-to-fiber ratio with high precision, we achieve:

Void Minimization:
Elimination of air pockets to prevent moisture ingress and structural degradation.
Thermal Regulation:
Strict monitoring of temperatures during the curing phase to maintain material integrity.
Hybrid Laminates:
Strategic integration of Glass and Carbon Fiber to balance cost-efficiency with extreme stiffness-to-weight ratios.

Industrial Serialization & Quality Assurance

We provide the consistency required by international Tier-1 partners, scaling from bespoke prototypes to serialized production of 24-meter marine hulls and commercial superstructures.

Repeatability: Standardized infusion protocols ensure that Unit 1 and Unit 100 possess identical mass and structural properties.
Traceability: Comprehensive material logging and batch testing for mission-critical industrial components.
Global Logistics: Established workflows for the secure transport of large-scale, high-value monolithic structures to international assembly lines.

Analytical Comparison: Composite Manufacturing Methodologies

  
        Feature
        Hand Lay-up (Conventional)
        Vacuum Infusion (Ultramarin Std)
        RTM (High Precision)
      
        Fiber Volume (Vf)
        ~30–40%
        55–65%
        55–65%
      
        Consistency
        Operator Dependent
        Process Controlled
        Highly Automated
      
        Structural Integrity
        Risk of Voids/Dry Spots
        Minimal Void Content
        Near-Zero Porosity
      
        Weight-to-Strength
        Standard efficiency
        Maximum efficiency
        Maximum efficiency

Feature	Hand Lay-up (Conventional)	Vacuum Infusion (Ultramarin Std)	RTM (High Precision)
Fiber Volume (V_f)	~30–40%	55–65%	55–65%
Consistency	Operator Dependent	Process Controlled	Highly Automated
Structural Integrity	Risk of Voids/Dry Spots	Minimal Void Content	Near-Zero Porosity
Weight-to-Strength	Standard efficiency	Maximum efficiency	Maximum efficiency

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