Celotex (Phenolic Resin)
Rigidity, electrical insulation and mechanical strength in a technical laminate. The reference material for high-demand electrical, electronic and mechanical applications.
What is Celotex?
Technical properties of the material
Excellent electrical insulation
Ideal for panels, bases and component supports.
High mechanical rigidity
With low weight compared to other engineering materials.
Moderate chemical resistance
To oils, greases and most weak chemical agents.
Easy to machine
It can be milled, drilled, sawed and cut with standard tools.
Dimensional stability
Under normal conditions of use and temperature.
Thermal resistance
Up to 120°C in continuous use.
Competitive cost
Economical compared to other engineering materials.
Homogeneous surface
Characteristic brown color, uniform appearance.
Main technical data
Main material properties according to international standards:
| Density (g/cm³) | 1.35–1.45 ISO 1183 |
|---|---|
| Flexural strength (MPa) | 90–120 ISO 178 |
| Flexural modulus (GPa) | 6–8 ISO 178 |
| Tensile strength (MPa) | 60–80 ISO 527 |
| Dielectric strength (kV/mm) | 10–20 IEC 60243 |
| Continuous use temperature (°C) | 120 — |
| Water absorption 24h (%) | 1.0 ISO 62 |
| Rockwell hardness | M80–M100 ISO 2039 |
Sectors where it is most used
- Electrical and electronic industry.
- Machinery and tooling manufacturing.
- Laboratories and measuring equipment.
- Aerospace and defense industry.
- Renewable energy and industrial electrical installations.
Formats and supply
We supply Celotex in the following standard formats, with the possibility of custom cutting and machining:
Celotex sheets
Thicknesses from 1 to 50 mm. Standard formats 1000×2000 mm. Color: characteristic brown.
Cut to size
We cut Celotex sheets to the exact dimensions you need.
CNC machined parts
We manufacture parts, templates and machining fixtures from technical drawings.
Common applications of Celotex
Due to its electrical insulation and rigidity properties, Celotex is used in multiple industrial sectors.
Frequently asked questions
Celotex is a kraft paper laminate impregnated with phenolic resin, also known as Pertinax or FR-2. It is used primarily for its electrical insulation and mechanical rigidity.
Yes. Celotex machines well with standard tools: milling, drilling, sawing and cutting. It produces dust during machining, so adequate ventilation is recommended.
Celotex has some moisture absorption, which may slightly affect its electrical properties in very humid environments. For applications in humid environments, improved versions such as FR-4 (fiberglass) are recommended.
Celotex (Pertinax / FR-2) uses paper as substrate, while FR-4 uses fiberglass. FR-4 has better mechanical and dielectric properties, especially in humid conditions, and is the standard in consumer electronics.
Yes. We cut Celotex sheets to the dimensions you need, and we also manufacture CNC machined parts according to technical drawings.
What those who already trust Ferplast say
We have been using Celotex from Ferplast for our machining templates for years. Consistent material, easy to work with and fair price.
For the base of our industrial electrical panels, Celotex is the standard. Ferplast always has stock and delivery times are very good.
Why choose Plásticos Ferplast?
Personalized service
We handle each project uniquely, adapting to the exact needs of each client.
Specialized advice
Over 70 years of experience enable us to recommend the optimal material and process for each application.
Minimum delivery times
We manufacture and supply in the shortest time possible, with express service available in 24h.
Maximum precision
State-of-the-art CNC technology for precise parts and impeccable finishes.