Glass Bead Sandblasting Cleaning Surface

Glass bead sandblasting (shot blasting) treatment is the use of high-speed moving glass beads to impact the surface of the workpiece, in order to achieve the purpose of cleaning, deburring, strengthening or modifying the surface.

1 .  What is the Glass Bead Blasting Media Made of?

SiO2：72.00 – 73.00%

Na2O：13.30 – 14.30%

CaO：7.20 – 9.20%

MgO：3.50 – 4.00%

2 . Glass Beads Blasting Media Size Chart

3 . Main Characteristics of Glass Bead Blsting Media

The chemical composition is inert silicon dioxide without disturbance of chemical activity.

Smoothsurface and good finish, which does not damage the mechanical accuracy of the workpiece.

Round elastic particles, impact resistant, which can be recycled many times with less loss.

Surface treatment with glass beads is cost-effective and precisely controlled.

Small wear to spray andprolong nozzle service life.

The workpiece surface after treatment is smooth, with a special aesthetic feeling, and improve the product value.

Suitable for dry and wet sand blasting

It is made of non-alkaline soda-lime materials and have good chemical stability.

No ferrous substances or other harmful substances andECO friendly.

4. The process is rigorous and requires adjusting parameters according to the workpiece material and processing requirements. The specific steps are as follows:

###1. Preliminary Preparation**
1. * * Workpiece pre-processing**
-Remove oil stains, rust, coatings, and other impurities from the surface of the workpiece (which can be done by solvent cleaning, alkali cleaning, acid washing, or high-pressure water rinsing) to avoid impurities affecting the sandblasting effect or contaminating the glass beads.
-To protect non processing areas of the workpiece (such as threaded holes and precision mating surfaces), rubber plugs, tape, specialized shielding covers, etc. can be used to prevent damage from glass bead impact.

2. * * Glass bead selection**
-Select appropriate glass bead parameters based on the workpiece material (metal, plastic, glass, etc.) and surface requirements (roughness, cleaning degree):
-* * Particle size * *: commonly used range of 0.1-3mm, small particle size (such as 0.1-0.5mm) is used for fine surface treatment (such as stainless steel polishing), and large particle size (such as 1-3mm) is used for removing thick rust, burrs, or strengthening treatment.
-* * Hardness * *: The Mohs hardness of glass beads is 6-7, which needs to be matched with the hardness of the workpiece (such as aluminum parts, avoid using too large particle size or too high speed to prevent deformation).
-Roundness: Priority should be given to glass beads with high roundness to reduce scratches on the surface of the workpiece and ensure uniform processing.

3. * * Equipment inspection and debugging**
-Check the sealing of sandblasting equipment (pressure tank, spray gun, conveying pipeline, recovery system, etc.) to ensure no air leakage or blockage.
-Debugging key parameters:
-Sandblasting pressure: generally between 0.2~0.8MPa (adjusted according to the material of the workpiece, such as commonly used 0.2~0.4MPa for aluminum alloy and 0.5~0.8MPa for steel).
-* * Spray gun distance and angle * *: The distance between the spray gun and the surface of the workpiece is usually 100-300mm, and the appropriate angle is 45 °~90 ° (the vertical spray has the strongest impact force, and the tilt angle is suitable for large-area uniform treatment).
-Sandblasting time: Set according to processing requirements (e.g. deburring may take 30-60 seconds, strengthening treatment may take 1-5 minutes).

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