Blog - JingHong

Phenolic Series

Bakelite Sheet Applications in Vintage Electronics and Audio Gear

Caroline Jia

Apr 14, 2026

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Glass Fiber Series

Troubleshooting Delamination in 3240 Epoxy Sheet Drilling

When we machine 3240 epoxy sheet materials, one of the most persistent problems we run into is delamination during drilling operations. The insulation laminate is made of woven glass fabric that is saturated with epoxy resin. It can separate into layers at the edges of holes if the drilling parameters are wrong, the tools are worn out, or the clamps aren't tight enough. The phenomenon weakens both the mechanical integrity and the performance of electrical insulation. It causes quality problems that electrical equipment manufacturers, power equipment builders, and auto part suppliers can't afford. Drilling can be turned from a problematic process into a reliable manufacturing step that keeps the material's high dielectric strength and dimensional stability by figuring out what causes the problems and using tried-and-true solutions.

James Yang

Apr 13, 2026

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Phenolic Series

NEMA Standards Explained: CE, LE, XX, and XXX Phenolic Sheets

Caroline Jia

Apr 13, 2026

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Glass Fiber Series

Aerospace Insulation: The Critical Role of G11 Epoxy Sheets

James Yang

Apr 13, 2026

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Glass Fiber Series

From Raw Material to Machined Part: The Epoxy Sheet Supply Chain

James Yang

Apr 10, 2026

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Phenolic Series

Custom CNC Machined Bakelite Parts vs. Injection Molding: A Cost Analysis

Caroline Jia

Apr 10, 2026

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Glass Fiber Series

Sourcing Flame-Retardant (UL94 V-0) Insulation Boards Overseas Safely

James Yang

Apr 10, 2026

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Phenolic Series

Evaluating Quality Control in Phenolic Resin Sheet Manufacturing

Caroline Jia

Apr 9, 2026

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Glass Fiber Series

The Benefits of Outsourcing FR4 CNC Machining Directly to the Material Manufacturer

When engineering managers and procurement specialists need to find precision-machined parts, working directly with a manufacturer of FR4 sheet for CNC machining services has clear benefits over using multiple vendors. This streamlined model gets rid of middlemen, making it possible to track materials from the production of raw epoxy laminates to the finished machined parts. Working directly with material suppliers lets you combine in-depth knowledge of the substrate with advanced fabrication skills. This leads to tighter tolerances, faster turnaround times, and cost structures that reflect the true costs of manufacturing rather than layered markups. This method works especially well for electrical insulation parts, PCB support structures, and thermal barriers, where the integrity of the material has a direct effect on safety and performance.

James Yang

Apr 9, 2026

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