Topex insulation knife for mineral wool 480 mm overall length, 335 mm blade - 17B900

The Topex insulation knife for mineral wool with a 480 mm overall length and a 335 mm blade is a handheld cutting tool designed to make straight, controlled cuts in mineral wool insulation. Its long blade allows for efficient trimming of mats and rolls, helping to achieve accurate edges and fit insulation around openings and fixtures. The tool is intended for use in construction and renovation projects where mineral wool is applied to walls, roofs and floors.

Advantages

The extended blade length provides straight, continuous cuts across insulation batts and rolls, reducing the need for multiple passes. The ergonomic handle and balanced overall length improve control and stability during cutting. The knife is optimized for mineral wool materials, offering reliable performance when trimming and shaping insulation without excessive tearing or fraying.

Suitable for

• Cutting mineral wool batts and rolls to size
• Trimming insulation around pipes, vents and window or door openings
• Preparing insulation for wall, roof and floor installations

Key specifications

• Overall length: 480 mm
• Blade length: 335 mm
• Tool type: handheld insulation knife for mineral wool
• Intended material: mineral wool insulation

How to use

Place the mineral wool on a stable surface and measure the required dimensions. Hold the knife by its handle with a firm grip and align the blade along the marked cutting line. Make a steady, continuous stroke through the insulation using the full blade length where possible to ensure a straight edge. For thicker sections, use several controlled passes rather than excessive force to avoid jagged cuts. Replace or sharpen the blade as needed to maintain clean cutting performance.

Usage recommendations

Use appropriate personal protective equipment such as gloves, long sleeves and eye protection when cutting mineral wool. Work in a well-ventilated area and avoid inhaling dust; consider using a dust mask or respirator when generating loose fibres. Store the knife safely with the blade covered when not in use.