1. Introduction
This manual provides instructions for the proper and safe use of the 3M 381C 100 Grit Aluminum Oxide Fiber Disc. Please read this manual thoroughly before using the product to ensure safe operation and optimal performance. Retain this manual for future reference.
2. Safety Information
WARNING: Industrial and occupational products are intended for workplace use by trained personnel. Misuse may result in injury, sickness, death, or property damage.
- Always select and use this product in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI).
- Refer to all product literature, user instructions, warnings, and other limitations provided by 3M.
- Ensure the user is trained in the proper handling and application of abrasive products.
- Wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, and respiratory protection, as required by the application and workplace safety standards.
- Consult an on-site safety professional, industrial hygienist, or other subject matter expert for product selection and use guidance.
- Do not use this product for consumer applications (e.g., home, personal, recreational/sporting).
For additional product information, visit www.3M.com.
3. Product Overview
The 3M 381C Fiber Disc is a high-performance abrasive product designed for various grinding and sanding applications. It features a durable fiber backing and aluminum oxide abrasive material, providing effective material removal and a consistent finish.
Figure 1: 3M 381C 100 Grit Aluminum Oxide Fiber Disc. This image displays the 3M 381C 100 Grit Aluminum Oxide Fiber Disc. It is a circular, reddish-brown abrasive disc with a coarse texture, featuring a central arbor hole for mounting onto compatible tools. The disc is designed for grinding and sanding applications.
Key Features:
- Abrasive Material: Aluminum Oxide
- Grit Number: 100
- Disc Diameter: 4 1/2 inches (114.3 mm)
- Construction Type: Coated
- Backing: Fibre
- Maximum Operating Speed: 13,300 RPM
4. Setup
- Inspect Disc: Before each use, visually inspect the fiber disc for any signs of damage, cracks, or excessive wear. Do not use damaged discs.
- Select Compatible Tool: Ensure the grinding or sanding tool is compatible with a 4 1/2 inch fiber disc and has a suitable backing pad.
- Mounting: Carefully mount the fiber disc onto the tool's backing pad, ensuring it is centered and securely fastened. Follow the tool manufacturer's instructions for disc attachment.
- Check RPM: Verify that the maximum operating speed of your tool does not exceed the maximum operating speed of the 3M 381C disc (13,300 RPM).
- Safety Gear: Put on all necessary personal protective equipment (PPE) before starting work.
5. Operating Instructions
- Secure Workpiece: Always secure the workpiece firmly to prevent movement during operation.
- Start Tool: Turn on the grinding or sanding tool, allowing it to reach full operating speed before making contact with the workpiece.
- Apply Pressure: Apply consistent, moderate pressure. Excessive pressure can lead to premature disc wear, heat buildup, and reduced performance.
- Maintain Angle: Hold the tool at an appropriate angle to the workpiece, typically between 15-30 degrees, for effective material removal and to prevent gouging.
- Movement: Move the disc smoothly and continuously across the workpiece to ensure even abrasion and prevent localized heat buildup.
- Cool Down: Allow the disc and workpiece to cool periodically, especially during prolonged use, to prevent overheating.
- Shut Down: When finished, lift the disc from the workpiece before turning off the tool.
6. Maintenance
- Storage: Store fiber discs in a dry, cool environment, away from direct sunlight and humidity, to maintain their integrity and performance.
- Inspection: Regularly inspect discs for wear, glazing, or loading. Replace discs that show significant wear or damage.
- Cleaning: If a disc becomes loaded with material, it may be possible to clean it using a dressing stick or wire brush, if appropriate for the disc type and application. Always follow safety guidelines when cleaning.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Poor material removal / Slow cutting | Disc is worn, glazed, or loaded; insufficient pressure; incorrect disc for application. | Replace disc; increase pressure slightly; ensure disc grit is appropriate for task. |
| Excessive heat buildup | Excessive pressure; prolonged contact in one area; disc loading. | Reduce pressure; move disc continuously; clean or replace disc. |
| Disc vibration or chatter | Improperly mounted disc; damaged disc; worn backing pad. | Re-mount disc securely; replace damaged disc; inspect and replace backing pad if necessary. |
8. Specifications
- Brand: 3M
- Model: 381C
- Abrasive Type: Coated
- Abrasive Material: Aluminum Oxide
- Grit Number: 100
- Disc Diameter: 4 1/2 inches (114.3 mm)
- Arbor Hole Diameter: 7/8 inches (22.2 mm)
- Backing Material: Fibre
- Maximum RPM: 13,300
- Item Weight: Approximately 0.8 ounces (per disc)
- Product Dimensions: 4.5"L x 4.5"W
9. Warranty and Support
For specific warranty information regarding 3M industrial products, please refer to the official 3M website or contact 3M customer service directly. 3M stands behind its products and provides support for industrial and occupational customers.
For technical assistance, product inquiries, or safety data sheets, please visit the official 3M website or contact your local 3M representative.
Website: www.3M.com