Red Steel Paper Sand Plate/Green Steel Paper Sand Sheet Purchase Notice

When purchasing red steel paper sanding discs (for rough metal grinding) and green steel paper sanding discs (for fine polishing), the following key points should be noted to ensure the selection of suitable products and safe use:

1. Material and specification selection

(1) Red steel paper sand tray (coarse grinding type)

Material: Mainly made of alumina (Al ₂ O ∝) or zirconia corundum (ZA), with high hardness and strong wear resistance.

Granularity selection:

24 #~60 #: Suitable for heavy rust removal and weld polishing.

80 #~120 #: Medium grinding, suitable for deburring and surface smoothing.

Size matching: Common diameters are 100mm (4 inches), 125mm (5 inches), and 180mm (7 inches), which need to be matched with angle grinders or sanding machines.

(2) Green steel paper sand sheet (fine type)

Material: Silicon carbide (SiC) or ceramic abrasive, with a finer texture.

Granularity selection:

150 #~240 #: Fine polishing, suitable for stainless steel and aluminum alloy.

320 #~600 #: Ultra precision grinding, used for mirror treatment.

Adhesive type:

Hard backing adhesive: suitable for flat polishing.

Soft backing adhesive: suitable for curved or complex shapes.

2. Purchase precautions

✅  Certification standards:

Choose products that comply with ISO 9001 or OSHA safety standards to avoid the fragility and injury of inferior sand discs.

✅  Brand and Quality:

Renowned brands such as 3M, Norton, and Saint Gobain have longer lifespan and higher grinding efficiency for their sand discs.

✅  Applicable equipment:

Confirm if the center hole size of the sand tray (such as 22.23mm standard angle grinder hole) matches the tool.

✅  Packaging and Storage:

Check if the packaging is moisture-proof, as moisture can cause the sandpaper adhesive to fail.

3. Usage and Safety Guidelines

Installation requirements:

Fix with a dedicated flange to ensure that the sand disc is centered without eccentricity.

After installation, idle for 10 seconds and check for shaking or abnormal noise.

Operating standards:

Red steel paper sand tray:

Suitable for hard materials such as metal and cast iron, prohibited for use with wood or plastic (prone to clogging).

Maintain a tilt angle of 15 °~30 ° to avoid overheating caused by flat pressure.

Green steel paper sand sheet:

For final polishing, it is necessary to use coolant (such as stainless steel work) to prevent burning.

Security protection:

Goggles, dust masks, and gloves must be worn.

Prohibit overspeed use (refer to the maximum RPM indicated on the sand tray).

4. Maintenance and replacement

Life expectancy assessment:

When the abrasive falls off by more than 30% or the grinding efficiency significantly decreases, it needs to be replaced.

The slipping of green steel paper sand indicates passivation.

Storage suggestion:

Store in a dry environment to avoid deformation caused by stacking.

5. Frequently Asked Questions and Answers

❓  Can red steel paper and green steel paper be mixed?

→ Not recommended. Red steel paper is used for rough grinding, while green steel paper is used for fine grinding. Mixing them will reduce efficiency.

❓  Why is the sand tray fragile?

→ It may be due to poor quality adhesive or moisture during storage. When purchasing, prioritize moisture-proof packaging products.

❓  How to improve the lifespan of the sand tray?

→ Avoid prolonged single point pressurization and regularly clean clogged metal shavings.

summarize

Red steel paper sand tray → metal rough grinding, rust removal, select low particle size (24 #~120 #).

Green steel paper sand sheet → fine polishing, choose high particle size (150 #~600 #).

Selecting specifications as needed and operating in a standardized manner can significantly improve the polishing effect and tool life!