Phenolic Cotton Cloth Laminated Sheets, commonly known as textolite sheets or bakelite cotton boards, are laminated materials made by hot pressing cotton cloths impregnated with a thermosetting phenol-formaldehyde-based binder. Adopting cotton cloth as the base, the material possesses high compression strength and resilience, along with outstanding wear resistance, and can be easily machined by drilling, cutting and forging. It retains stable structural integrity and insulating properties in air and transformer oil under normal relative humidity, with a long-term allowable working temperature ranging from -65°C to +105°C, which makes it ideal for manufacturing components subjected to reversed electrical and mechanical stresses and friction applications such as bushings, gears, cams, and bearings.
Very good mechanical and thermal properties
Continuous operating temperature up to 120°C
Approved for oil and air
Low friction coefficient
High creep resistance
Vibration absorption
Higher load bearing vs. paper laminates
Good electro-insulation
Available for CNC custom machining, cutting, turning and custom fabricated parts
| Phenolic Cotton Cloth Laminated Sheet (Similar to NEMA C/CE/L/LE) | |||
| Properties | Unit | Value | |
| Flexural strength perpendicular to laminations | MPa | ≥100 | |
| Bonding strength ( ≥10mm in thickness) | N | ≥5400 | |
| Impact strength parallel to laminations (Charpy) | KJ/m2 | ≥8.8 | |
| Insulation resistance after immersion in water (D-24/23) | Ω | ≥1×10⁶ | |
| Dielectric strength perpendicular to laminations (in 90±2℃ transformer oil, 1 mm in thickness) |
MV/m | ≥0.82 | |
| Breakdown voltage parallel to laminations (in 90±2℃ transformer oil) |
KV | ≥1 | |
| Density | g/cm3 | 1.40 | |
| Water absorption (D-24/23, 1.6mm in thickness) | mg | ≤220 | |
| Color | — | Natural | |
Ball Race Cages
Gears (Medium Tooth)
Bushings, Spacers & Sleeves
Wear Resistant Components (Wear Plates, Guide Rails)
Low Voltage Electrical Insulation
Piston Rings & Sealing Components
Jigs, Fixtures & Punched Components
Compressor Rotor Blades
Bolts, Screws & Fasteners
Cryogenic & High Stability Parts
1. Material Grades
Our phenolic cotton laminates are available in standard grades tailored for different applications:
| Grade | Fabric Type | Typical Applications | Key Characteristics |
| 3025 | Coarse cloth | General mechanical parts, gears, bearings, wear-resistant components | High mechanical strength, excellent impact resistance, cost-effective |
| 3026 | Fine cloth | Precision machined parts, small gears, tight-tolerance components | Superior dimensional stability, smooth surface finish, consistent machining accuracy |
2.International Standard Equivalents
Phenolic cotton cloth laminates deliver balanced performance and cost benefits against mainstream alternative engineering materials.
Compared with FR4/G10 epoxy glass cloth, phenolic cotton laminate is 20-40% more cost-effective. It offers qualified mechanical properties for general mechanical use, making it a more economical choice where premium electrical performance is not required.
Compared with phenolic paper laminates 3020/3021, cotton cloth type has a slightly higher raw material cost, but provides far better mechanical strength and wear resistance. It achieves longer service life and lower overall lifecycle cost under heavy mechanical and friction working conditions.
Compared with metal materials such as bronze and aluminum, phenolic cotton laminate can reduce volume cost by 40-70%. Its low density greatly reduces transportation and operation energy consumption, while excellent self-lubrication and corrosion resistance also save daily maintenance expenses.
GBS Die Cut, as adhesive tape supplier, focuses on the research & development, production and sales of various types of adhesive tapes for different industries and has been authorized as golden distributor of many noted brands for so many years, such as Nomex, Formex, Rogers Poron, 3M, Tesa, and so forth.
Transformer insulation papers and flexible laminates are essential materials that ensure dielectric strength, thermal endurance, and mechanical stability in transformers, motors, and other electrical equipment. These materials are widely used
In the medical industry, medical tapes are not just for simple fixation; they play a crucial role in wound care, medical device adhesion, and surgical protection, directly impacting patient comfort
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