Overview
Black and orange phenolic laminated sheet, often referred to as bakelite, is a composite material made by impregnating layers of paper or fabric with phenolic resin and then subjecting them to heat and pressure. This process creates a rigid, durable sheet with excellent electrical insulation properties and mechanical strength. The distinctive black and orange coloration serves both functional and aesthetic purposes, with the orange often indicating high-grade electrical insulation material. It has been a staple in electrical and industrial applications for decades due to its reliability and cost-effectiveness.
Physical and Chemical Properties
Phenolic laminated sheets exhibit exceptional dimensional stability and low thermal expansion, making them suitable for precision applications. The material typically has a density of 1.3-1.4 g/cm³ and can withstand continuous operating temperatures up to 120°C, with short-term peaks to 150°C. Chemically, these sheets are resistant to most solvents, oils, and weak acids. However, they may degrade when exposed to strong acids or alkalis. The material has low water absorption (typically less than 1%), which helps maintain its electrical properties in humid environments.
Main Applications
The primary use of black and orange phenolic sheets is in electrical insulation applications, including switchgear components, terminal boards, and circuit breaker parts. The material's combination of electrical and mechanical properties makes it ideal for these applications. Beyond electrical uses, these sheets are commonly machined into gears, bearings, and other mechanical components where low friction and wear resistance are required. The material is also used for laboratory tabletops and industrial work surfaces due to its chemical resistance and durability.
Safety and Storage
While phenolic laminates are generally safe when properly handled, machining operations can generate dust that may irritate the respiratory system. Adequate ventilation and personal protective equipment, including dust masks, should be used during fabrication. For storage, the sheets should be kept flat in a dry environment at temperatures below 35°C. Stacking should be limited to prevent warping, and sheets should be protected from direct sunlight to prevent discoloration or degradation of surface properties.
B2B Procurement Guide
When procuring black and orange phenolic sheets, buyers should specify the required thickness (commonly ranging from 1mm to 50mm), sheet dimensions, and specific material grade. Electrical applications typically require higher-grade materials with superior dielectric properties. Lead times can vary depending on the specific requirements, so buyers should plan accordingly. For large-volume purchases, it's advisable to request material certification and samples for testing before placing full orders. Pricing typically decreases with larger order quantities.
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