Phenolic Cotton Laminated Sheets

4 month ago

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8 month

Product details

AHD’s Phenolic Cotton Cloth Sheet is a high-performance composite material engineered by impregnating high-quality cotton cloth with premium phenolic resin, followed by high-temperature and high-pressure molding. Designed for industrial applications demanding robust mechanical performance and reliable insulation, this sheet serves as a core component in electrical equipment, mechanical structures, and precision machinery.

AHD 3025 Cotton sheet, also call Phenolic Sheet.

Its core advantages lie in superior mechanical strength (resistant to impact and deformation), excellent electrical insulation (suitable for high-voltage scenarios), and strong environmental adaptability (withstands harsh operating conditions like humidity and moderate chemicals). For B2B buyers in sectors such as electronics, automotive, and industrial machinery, it offers a cost-effective, long-lasting solution that balances functionality and durability—eliminating frequent replacements and reducing maintenance costs.

Technical Specifications

Specification	Details
Material	Phenolic resin + high-density cotton cloth
Thickness Range	0.8mm - 100mm (customizable for bulk orders)
Operating Temperature Range Continuous:	-30℃ to +150℃; Short-term (30 mins max): +180℃
Electrical Insulation Strength	≥15 kV/mm (at 25℃, dry condition)
Tensile Strength	≥85 MPa (longitudinal); ≥75 MPa (transverse)
Flexural Strength	≥120 MPa
Water Absorption	≤1.2% (24h immersion at 25℃)
Flame Retardancy	UL94 V-0; Self-extinguishing (no dripping)
Surface Finish	Smooth

cotton Phenolic Resin Sheet

Product Features (Advantages & Differentiators)

1. Premium Raw Material & Precision Manufacturing

We use high-grade, lint-free cotton cloth (ensures uniform resin impregnation) and industrial-grade phenolic resin. Unlike competitors who cut costs with recycled cotton or low-purity resin, AHD’s material guarantees consistent performance and no premature aging.

Advanced Molding Technology: Equipped with 250+ ISO-certified imported production lines, our Phenolic Board are pressed at precise temperature and pressure controls. This eliminates internal bubbles or uneven layers—common issues in cheaper alternatives—and ensures a dense, stable structure.

2. Outstanding Mechanical & Insulation Performance

High Load-Bearing Capacity: With tensile strength ≥85 MPa and flexural strength ≥120 MPa, the sheet withstands heavy mechanical stress (ideal for machine brackets, gear guards, and structural components). It outperforms standard phenolic paper sheets (tensile strength ≤60 MPa) in industrial load scenarios.

Reliable High-Voltage Insulation: Insulation strength ≥15 kV/mm makes it suitable for high-voltage electrical equipment (e.g., transformer windings, switchgear panels). It maintains insulation integrity even in humid environments (water absorption ≤1.2%), avoiding short circuits caused by moisture penetration.

3. Durability & Environmental Adaptability

Wide Temperature Tolerance: Operates stably from -30℃ to +150℃ (continuous use) and up to +180℃ for short periods—perfect for harsh industrial environments .

Chemical Resistance: Resistant to weak acids, alkalis, and industrial oils (excluding strong corrosives like concentrated sulfuric acid). This extends service life in chemical processing plants compared to non-resistant plastic sheets.

4. Customization & AHD’s Unique Advantages

Flexible Customization: We offer tailored thickness (0.8mm-100mm), sizes (beyond standard 1000mm x 2000mm), and surface finishes (smooth/textured) to match your specific application.

Strict Quality Control: Every batch undergoes 3-tier inspection (raw material test → in-process thickness/density check → final insulation/strength test) by AHD’s technical specialists (including 30+ senior engineers).

Global Compliance & Fast Delivery: Lead time is 7-10 days for standard orders, 10-15 days for custom orders .

The Advantages of Phenolic Fabric Boards and the Core Reasons for Their Continued Use

Despite the continuous advancements in modern materials (such as epoxy boards, polyimide, and engineering plastics), phenolic fabric boards remain irreplaceable in traditional applications due to their superior balance of performance, cost, and process. The reasons are as follows:

1. Excellent Overall Performance, Suitable for Multiple Scenario Needs

The "Golden Triangle" of Heat Resistance, Insulation, and Strength: The cross-linked structure of phenolic resin imparts high heat resistance (105°C long-term, 200°C short-term) and high insulation (breakdown voltage >30kV/mm). The cotton fabric layered structure provides mechanical strength superior to pure resin (tensile strength 50-100MPa, flexural strength 100-200MPa). This combination of heat resistance without brittleness and insulation without softening is a characteristic that most engineering plastics cannot simultaneously achieve.

Chemical and Aging Resistance: Phenolic cloth panels exhibit excellent resistance to oils, weak bases, and organic solvents (such as ethanol), with the exception of strong oxidizing acids like concentrated nitric acid and aqua regia. Their performance degrades slowly even after long-term exposure to humid or salt spray environments (e.g., marine equipment), surpassing common metals (which are prone to rust) and some plastics (which are prone to swelling).

2. Significant Cost-Effectiveness and Mature Process

Low Raw Material Cost: Cotton cloth (a natural fiber) and phenolic resin (phenol + formaldehyde) are both bulk chemical raw materials. The production process (dip coating and hot pressing) is mature, and the cost of large-scale production is significantly lower than that of high-performance engineering plastics or ceramics.

Compatible with Existing Equipment: Phenolic cloth panel processing (cutting, drilling, and turning) can be performed on conventional metalworking equipment (requiring only adjustments to tools and parameters), eliminating the need for additional investment in expensive equipment (such as CNC precision machining centers), lowering the entry barrier for small and medium-sized enterprises.

3. Fully Verified Reliability and High Industry Trust

Century of Application History: Since its industrialization in the early 20th century, phenolic cloth board has accumulated decades of reliable operating data in the electronics, rail transit, and machinery sectors (e.g., verifying the lifespan of motor insulation components). Its performance stability is widely recognized within the industry.

Safety Standard Compliance: As a Class A non-combustible material (low smoke emission), phenolic cloth board is irreplaceable in sectors with stringent fire protection requirements, such as rail transit and aerospace.

4. Strong Designability, Adaptable to Customization Needs

Flexible Thickness and Shape: By adjusting the number of dip coating layers (3-20), sheet thicknesses from 0.8-100mm can be produced. Rods can be formed by rolling or compression molding. Complex shapes (e.g., structural parts with slots or holes) can be formed in one step using hot pressing dies, reducing subsequent machining.

Surface functionalization: Through coating, plating or modification (addition of flame retardants, toughening agents), its application scenarios can be further expanded (such as seals for humid environments and high-wear-resistant gears).

Phenolic sheets maintains its dominant position in low- and mid-range industrial applications (such as general-purpose insulation and wear-resistant structural parts) thanks to its comprehensive performance in heat resistance, insulation, and strength, low-cost process maturity, and century-long industry-proven reliability. While newer materials may replace it in high-precision or extreme environments, Phenolic Laminate Sheet remains a classic choice in the industrial field, balancing performance and cost.