The Erma Type Rotary Microtome is a widely used laboratory instrument in India for histological and pathological research. It is specifically designed for cutting uniform tissue sections as thin as 1 micron.
Key Specifications and Features
- Section Thickness Range: Typically adjustable from 1 to 25 microns (some advanced models up to 50 microns) in increments of 1 micron.
- Mechanism: Features a cam-drive mechanism with a ball and flange type object holder for precise specimen centering.
- Feeding Movement: Total feed excursion is approximately 28 mm.
- Durability: Usually constructed with a heavy metallic base and a protective cover to house the internal mechanism.
- Standard Accessories: Often includes three object holders, a razor (typically 120 mm), and a honing stone for maintenance.
- Section Thickness: Typically adjustable from 1 to 25 microns (μm) in steps of 1 micron each. Some variants may offer ranges up to 30 microns.
- Operation: Manual rotary control via a handwheel. Rotating the wheel moves the specimen holder vertically against a stationary knife.
- Core Components:
- Specimen Holder: Often a ball-and-flange type that allows for precise centering and orientation.
- Knife/Razor: Usually supplied with a 120mm razor made of high-quality alloy or grain steel.
- Protective Housing: The internal mechanism is typically encased in a metallic cover (often mild steel or cast iron) to protect it from dust and debris.
- Construction: Built with a heavy cast-iron base to provide stability and reduce vibrations during cutting.
Standard Accessories
- A 120mm razor with back and handle.
- A set of three object holders.
- A honing plate/stone for knife maintenance.
- An oilcan for lubrication of the internal gears.
- A dust cover for the entire machine.
Applications
The Erma-type microtome is widely used in:
- Medical & Diagnostic Labs: Preparing tissue slides for pathological examination.
- Education: Standard equipment in medical colleges and biology departments.
- Industrial Research: Analysis of materials like plastic, leather, textiles, and rubber.

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