Glass fibre reinforced polyester is consolidating its position as the most reliable alternative to metal and thermoplastics.
The choice of material for industrial enclosures used outdoors is no longer an exclusively technical decision.
In the current context, it has become a factor with direct impact on profitability, maintenance and the operational continuity of industrial installations.
In sectors such as energy, telecommunications, water or infrastructure, where environmental conditions are especially demanding, the comparison between metal enclosures, thermoplastic enclosures and glass fibre reinforced polyester (GRP) enclosures is evolving towards a more strategic approach.
Since 1972, SAFYBOX URIARTE has developed and manufactured technical enclosures in glass fibre reinforced polyester in Europe. This specialisation is not part of a conventional multi-material catalogue. It is the technological core on which the company has built its industrial identity for more than five decades.
Because an enclosure should not be assessed by its performance on day one, but by how it responds when the environment starts to challenge it.
Not all materials perform the same outdoors
Metal and thermoplastics: widely used solutions with limitations outdoors
Metal enclosures have historically been an established solution due to their robustness. However, in outdoor applications, their performance is conditioned by factors such as humidity, salinity or environmental pollution.
Over time, processes of corrosion and coating degradation may occur, affecting sealing performance, maintenance requirements and system service life.
Meanwhile, thermoplastic enclosures, manufactured from materials such as ABS or polycarbonate, have gained presence in certain environments thanks to their light weight, ease of machining and electrical insulation capability.
However, their outdoor performance largely depends on the material formulation and exposure to factors such as UV radiation, thermal cycles or ageing.
At this point, it is essential to introduce an increasingly relevant technical distinction:
Not all polymeric materials perform the same outdoors.
The difference between a thermoplastic and a thermoset composite material is not only one of composition, but of structural stability over time.
GRP Enclosures: structural stability and lower dependence on the environment
Glass fibre reinforced polyester (GRP) represents a different approach to the design of outdoor industrial enclosures.
As a thermoset material, it does not soften or deform under thermal variations, offers corrosion immunity and maintains stable performance in humid environments and under UV radiation (depending on formulation).
This combination of properties significantly reduces dependence on environmental conditions and helps maintain enclosure performance over time.
For this reason, outdoor GRP electrical enclosures are increasingly used in infrastructures where operational continuity is critical and maintenance must be minimised.
From initial cost to real cost: a shift in approach for outdoor installations.
For years, the selection of outdoor electrical enclosures has been based on immediate variables such as price, availability or ease of installation.
However, this approach overlooks key factors that directly affect the real cost of the system:
- Long-term maintenance
- Material degradation
- Premature replacements
- Risk of failure in service
The choice between metal, thermoplastics or GRP should not be approached in absolute terms, but according to real operating conditions.
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Safybox Uriarte: Over 50 years perfecting GRP polyester
The real performance of an enclosure does not depend solely on the material itself, but on the expertise applied to its design, formulation and manufacturing process.
In the case of GRP, factors such as thickness, resin composition and protective additives directly influence its long-term behaviour.
Specialised European manufacturers such as SAFYBOX URIARTE have developed their expertise around this material for decades, focusing their solutions on industrial environments where durability and structural stability are essential requirements.
Since 1972, as a European manufacturer exclusively specialised in industrial enclosures made of glass fibre reinforced polyester, the company has not followed passing trends. It has developed and perfected one material until it became the technological core of its industrial identity.
And in industry, accumulated expertise is what truly makes the difference.
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