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I. Preliminary Screening by Visual Inspection and Touch

Do not rush to instrumental testing after receiving pepejal silikon sheets. Examine details just like an antique appraiser:

• The surface shall be smooth and mirror-like. Fish-scale patterns or burrs indicate defective rolling processes.
• The neatness of cut edges reflects machining precision; jagged cuts may impair stacking compactness.
• Run fingers lightly over the surface. High-quality pepejal silikon feels silky smooth, while rough texture usually signals incomplete annealing.
• Fold a test piece to check resilience. Excessive brittleness or softness is a sign of improper heat treatment.

II. Practical Tests for Electromagnetic Performance

Lab test reports are important, yet these field-operable inspection methods deliver more intuitive results:

• Comparative core loss test: Test specimens of identical dimensions at 50 Hz. Premium pepejal silikon registers lower loss per unit mass.
• Magnetic permeability check: Bring the sheet close to a magnet and feel the uniformity of attraction. Spots with weak local attraction may suffer from composition segregation.
• Stacking factor verification: Randomly take 20 sheets for stacking, then calculate the ratio of actual thickness to theoretical thickness. Qualified products achieve a stacking factor above 95%.

III. Long-Term Service Performance Verification

Truly high-grade material stands the test of time:

• Dismantle equipment after six months of operation for inspection. Good silicon steel retains its original color, whereas inferior sheets develop oxidized speckles.
• Measure temperature rise after long-term operation. Stable silicon steel limits temperature fluctuation to within 10% of the initial value.
• Dimensional stability after repeated disassembly and assembly. Top-tier sheets maintain flatness above 99% even after five assembly-disassembly cycles.