Product proview

Precision-Polished High-Purity Iron Plates represent the pinnacle of material engineering, combining exceptional purity (≥99.7% Fe) with sub-micron surface flatness (parallelism tolerance ±0.001mm or ±1 micron). Unlike standard cast iron plates used in weightlifting or machinery-which prioritize mass and structural tolerance (±2%)-these plates serve as metrological reference surfaces. Their ultra-stable, non-porous structure ensures near-zero thermal expansion and corrosion-free performance, making them indispensable for calibration, scientific research, and high-tolerance manufacturing.

Why High-Purity Iron? The Science Behind the Standard

1. Material Purity as the Foundation

- >99.995% Iron Content: Achieved through electrolytic refining, this grade minimizes trace elements (C ≤0.01%, S ≤0.0008%, Si ≤0.10%) that cause grain boundary instability, oxidation, or magnetic interference.

- Contrast with Commercial Iron: Common "pure iron" (99.7–99.8% Fe) contains sulfur/manganese inclusions that create micro-pits during polishing. Our plates eliminate this flaw, enabling true mirror finishes.

2. Precision Polishing: Beyond Surface Smoothness

- Dual-Sided Grinding: Processed via diamond-wheel CNC grinders, these plates achieve Ra 0.8μ surface roughness-equivalent to optical components.

- Flatness Certification: Each plate is laser-verified against Grade AA granite surface plates (ISO 8512), with results traceable to NIST standards.

3. Relativistic Stability

High-purity iron's face-centered cubic (FCC) lattice structure provides unmatched dimensional rigidity. Unlike aluminum or brass, it resists micro-deformation under load-critical for metrology jigs lasting decades.

Technical Specifications

Parameter	Specification	Industry Standard Comparison
Material Purity	99.7% Fe (SPHC/DT4A Grade)	99.5% (Commercial Pure Iron)
Flatness Tolerance	±0.001 mm (±1 micron)	±0.02 mm (Machined Steel Plate)
Surface Finish	Ra ≤0.8 μm (Mirror Equivalent)	Ra 3.2 μm (Ground Tooling Plate)
Thermal Expansion	11.8 μm/m·°C (20–100°C)	23 μm/m·°C (Aluminum 6061)
Dimensions	100x100mm to 500x750mm; Thickness 5–50mm	Limited custom sizes
Certification	ISO/IEC 17025 Calibration Report Included	N/A

FAQs: Addressing Critical User Concerns

Q: Can these replace granite surface plates?

A: They complement granite. Iron plates are portable, non-brittle, and magnetic-ideal for mounting sensors. Granite excels in massive, vibration-damped tables.

Q: Why not use ceramic or steel plates?

A: Ceramics (e.g., alumina) embed abrasive particles, contaminating workpieces. Steel plates often have >5μm "print-through" from subsurface carbides. Our iron's homogeneity prevents this.

Q: How do I verify flatness post-purchase?

A: Use a monochromatic light source (e.g., sodium lamp). Newton's rings should show ≤1 fringe deviation across 100mm.