Mid Loss PCB Laminate Properties Baseline Guide
Mid-loss laminates balance dissipation factors between 0.005 and 0.010 with moderate panel costs, matching PCIe Gen 4 and 10GbE signal integrity demands.
T288 Delamination
Resistance Limit
Thermal durability of printed circuit boards is measured by their resistance to material separation under high soldering temperatures. Under the standardized testing framework, T288 delamination defines the time it takes for a laminate to separate or blister when held at two hundred and eighty-eight degrees Celsius. This assessment evaluates the chemical stability of the resin system and its bond with the reinforcing glass fiber.
Boards that survive this test longer are better suited for multiple lead-free reflow cycles.
Failure Mechanism
Volatile compounds and moisture trapped within the resin matrix expand rapidly when exposed to the high temperature of the test bath. This expansion exerts intense internal pressure against the polymer bonds and the glass-epoxy interfaces. If the adhesive strength of the resin is low, the layers separate, forming visible blisters or internal gaps.
The time to failure is recorded in minutes, with high-quality material surviving for more than fifteen minutes before structural separation begins.
Thermal Verification
Thermomechanical analysis using specialized probes is used to detect the exact moment the laminate layers begin to separate. This analytical tool records changes in board thickness as heat is applied to the sample. A sudden increase in thickness or a drop in probe pressure indicates a failure.