I. Definition of Durostone Sheet
Durostone Sheet is a high-performance fiber-reinforced thermosetting composite material sheet, primarily made of glass fiber cloth and thermosetting resins (such as phenolic resin, epoxy resin, or vinyl ester resin) through a lamination process. Its brand name "Durostone" was originally registered by the Swiss company Schweiter Technologies and is now commonly used as the generic name for this type of composite material. This material combines the high strength of fibers with the corrosion resistance and heat resistance of resins, belonging to industrial-grade high-performance engineering plastic sheets.
II. Core Advantages and Characteristics
Durostone Sheet's performance makes it stand out in harsh environments. Its main advantages include:
1. Excellent Mechanical Properties
High Compressive/Impact Strength: Tensile strength can reach 80-150 MPa (depending on the formulation), and flexural strength is 100-200 MPa, far exceeding that of ordinary plastics and approaching that of some metals.
Fatigue Resistance: Resists cracking under repeated stress, making it suitable for long-term load-bearing applications (such as jigs and fixtures).
2. Excellent Chemical Resistance
Durostone board is highly resistant to acids, alkalis, and organic solvents (such as acetone and gasoline). It can withstand long-term contact with corrosive media without swelling or decomposition, surpassing metals (which are prone to rust) and ordinary plastics (which are easily swelled by strong solvents).
3. Wide Temperature Range Stability
High Temperature Resistance: Short-term temperature resistance reaches 350°C (depending on the resin type, higher for phenolic resin-based materials) and long-term operating temperature reaches up to 250°C, far exceeding epoxy resin-based composite materials.
Low Shrinkage: Low thermal expansion coefficient (approximately 2-5 × 10⁻⁵/°C), ensuring dimensional stability under high temperatures or temperature fluctuations, preventing deformation (e.g., in precision mold supports).
4. High Electrical Insulation
Volume resistivity ≥ 10¹² Ω·cm and high breakdown voltage (≥ 20 kV/mm), making it suitable for insulating components in the electrical and electronic fields (e.g., circuit board brackets, high-voltage insulation pads).
5. Low Moisture Absorption and Aging Resistance
Water absorption is less than 0.5% (much lower than wood or ordinary epoxy boards). It is resistant to wet and heat aging (e.g., no failure after long-term use at 85°C/85% RH), making it suitable for humid or high-humidity environments (e.g., outdoor equipment supports).
6. Ease of Machining
It can be sawed, drilled, and CNC-engraved. The surface is easily sanded and polished without the need for special tools. Machinability is similar to that of wood or acrylic, but with superior performance.
III. Usage and Processing
Processing of Durostone Sheet requires consideration of its material properties. Common operations include:
Cutting:
It is recommended to use a carbide saw blade (such as tungsten carbide) or laser cutting to avoid edge delamination caused by excessive heat from friction with ordinary steel blades. Cutting speed should not be too fast to prevent resin scorching.
Drilling and Milling:
Use carbide drill bits and reduce the rotation speed. Use reverse feed to reduce delamination. Chamfering is recommended after drilling to prevent edge stress concentration and cracking.
Bonding and Fixing:
Epoxy or acrylic structural adhesive can be used for bonding, ensuring the surface is clean. Mechanical fixing (bolts, rivets) is more reliable, but pre-drilling is necessary to prevent material chipping.
Surface Treatment:
Painting, electroplating, or polishing are possible, but a primer (such as epoxy primer) must be applied first to enhance adhesion. Avoid using strong corrosive cleaning agents (such as strong acids and alkalis).
There are many types of Durostone sheet, including Durostone CAS761 (anti-static), Durostone CFR767 (corrosion-resistant), Durostone EPM 203, and Durostone UPM 203.
IV. Main Application Scenarios
Durostone Sheet, with its comprehensive performance, is widely used in industrial fields requiring strength, temperature resistance, corrosion resistance, or insulation:
Rail Transportation: Car flooring, cable trays, equipment housings (oil-resistant, flame-retardant);
Electrical and Electronic: Insulating partitions, transformer supports, high-voltage switch housings;
Industrial Equipment: Mechanical protective plates, gear/bearing supports, corrosion-resistant reactor linings;
Automotive Industry: Braking system components, heat-resistant parts around the engine;
Chemical and Energy: Corrosion-resistant pipe flanges, storage tank linings, electroplating tank partitions;
Aerospace: Non-load-bearing structural components (requires carbon fiber reinforcement).
V. Precautions
When using Durostone Sheet, please pay attention to the following:
Processing Safety: Fiberglass dust will be generated during cutting or drilling. Wear a mask, goggles, and gloves to avoid inhalation or skin contact (long-term inhalation may cause respiratory irritation).
Thermal Stress Control: Avoid sudden temperature changes during installation (e.g., direct contact between high-temperature equipment and low-temperature environments). Allow for expansion gaps or choose a fixing method with a coefficient of thermal expansion that matches the substrate.
Environmental Adaptability: Long-term exposure to ultraviolet light will accelerate resin aging. It is recommended to apply a UV protective layer. Avoid contact with strong oxidizing agents (such as chromic acid).
Repair and Replacement: For localized damage, cover with a sheet of the same material and bond with structural adhesive to avoid large-area replacement. If the resin layer peels off, it needs to be re-laminated for repair.
Compliance: Select products that meet industry standards according to the application scenario.
In summary, Durostone Sheet is a high-performance fiber-reinforced composite material with high strength, temperature resistance, corrosion resistance, and insulation as its core advantages. It is widely used in industrial, transportation, and electrical fields. When using it, attention must be paid to processing safety, thermal stress control, and environmental protection to ensure long-term performance stability.
