Large Drop-on Glass Beads for Dual-Drop Road Markings

🔷 Product Overview

Large Drop-on Glass Beads are coarse reflective particles developed for dual-drop road marking systems. With a particle-size range of approximately 600–1400 μm, they are visibly larger than conventional surface-applied road marking beads.

In a typical dual-drop system, standard or fine glass beads provide broader surface coverage, while the large beads create greater particle exposure above the marking surface. This combination can support stronger and more durable retroreflective performance when matched with a sufficiently thick road marking layer.

The product is primarily recommended for thick-layer thermoplastic markings and other specially designed marking systems capable of securely retaining large particles.

✨ Main Product Advantages

🔘 Large 600–1400 μm Gradation

The coarse particle-size range distinguishes this product from ordinary drop-on glass beads.

Larger particles remain more prominently exposed above the marking surface when correctly embedded. This allows a greater portion of the bead to receive vehicle headlight illumination while retaining sufficient depth inside the marking material.

⚙️ Designed for Dual-Drop Application

This product can be applied together with a finer glass-bead grade in a controlled dual-drop system.

The two bead types perform different functions:

• Fine or standard beads improve surface coverage.

• Large beads provide greater particle exposure.

• Combined gradations create a more structured reflective surface.

• The complete system can maintain reflective points as the marking experiences surface wear.

The dispensing equipment must be capable of controlling the two bead grades independently.

💡 Greater Bead Exposure

Because of their larger diameter, correctly applied particles can remain more exposed than standard beads.

However, larger particles do not automatically guarantee higher retroreflection. Performance still depends on bead quality, embedding depth, marking thickness, application rate and construction control.

⚪ Complementary Particle Structure

Using both smaller and larger particles helps create multiple reflective levels across the marking surface.

Smaller particles occupy the spaces between larger beads, while the larger particles remain more prominent. This structure can provide more consistent reflective coverage than applying an unsuitable single coarse gradation alone.

💧 Moisture-Resistant Treatment

The product can be supplied with moisture-resistant surface treatment to help reduce caking and support stable flow through the dispensing equipment.

The beads must still be stored in sealed packaging and protected from rain, high humidity and wet warehouse floors.

🛣️ Recommended Applications

Large Drop-on Glass Beads are suitable for:

• Dual-drop road marking systems

• Thick-layer thermoplastic markings

• Highway lane markings

• Expressway edge and center lines

• Urban arterial road markings

• High-wear traffic areas

• Intersections and directional markings

• Projects requiring a coarse bead gradation

• Customized reflective marking systems

The road marking material must have sufficient thickness and adhesion to retain the large beads securely.

⚙️ Dual-Drop Application Method

1. Confirm Marking Thickness

The marking layer must be thick enough to provide secure embedding for 600–1400 μm particles.

If the layer is too thin, the large beads may remain excessively exposed and detach prematurely under traffic.

2. Use Separate Dispensing Controls

Fine and large glass beads should be stored and dispensed through separately controlled equipment.

The equipment should provide:

• Stable bead flow

• Uniform transverse distribution

• Accurate application rate

• Correct dispensing sequence

• Minimal blockage or particle segregation

3. Apply While the Material Is Fresh

Both bead grades must be applied while the thermoplastic material remains molten and capable of receiving the particles.

Delayed application can reduce embedding and adhesion.

4. Control the Embedding Depth

The large beads should be partially embedded.

Insufficient embedding causes poor retention, while excessive embedding reduces the exposed surface available for retroreflection.

5. Conduct a Construction Trial

Before full-scale application, conduct a trial section to determine:

• Fine-bead application rate

• Large-bead application rate

• Marking thickness

• Dispenser height and speed

• Bead embedding depth

• Initial retroreflectivity

• Bead retention after curing

🔬 Technical Data

Product Type: Large drop-on glass beads
Application System: Dual-drop road markings
Particle-Size Range: 600–1400 μm
Reference Standard: GB/T 24722-2020
Refractive Index: ≥1.50
Surface Treatment: Moisture-resistant coating
Recommended Material: Thick-layer thermoplastic markings
Packaging: 25 kg/bag

The final particle distribution and technical requirements should be confirmed through an approved sample, quotation or batch technical documentation before ordering.

⚠️ Important Technical Limitations

This product must not automatically be described as:

• AASHTO M247 Type III glass beads

• EN 1423 glass beads

• Wet-night glass beads

• All-weather glass beads

• Rainy-night certified glass beads

The domestic product description “美3珠” does not by itself prove compliance with AASHTO M247 Type III.

The current product page should therefore focus on its confirmed large-particle range and dual-drop application rather than making an unsupported international-standard or wet-night performance claim.

📦 Packaging and Storage

The standard export package is a sealed 25 kg laminated woven bag.

Store the product in a cool, dry and ventilated warehouse. Keep the bags sealed before use and protect them from:

• Rain and excessive humidity

• Direct contact with wet ground

• Torn or open packaging

• Oil, dust and chemical contamination

• Prolonged outdoor storage

Palletized storage and external moisture-protective wrapping are recommended for export transportation.

✅ Quality Control

Quality-control items may include:

• Particle-size distribution

• Visual appearance

• Particle roundness

• Refractive index

• Density

• Moisture resistance

• Surface-treatment condition

• Dispensing flow

• Packaging integrity

For dual-drop projects, the complete combination of fine beads, large beads and road marking material should be tested before formal construction.

❓ Frequently Asked Questions

What is a dual-drop glass-bead system?

A dual-drop system applies two different bead gradations to fresh road marking material. A finer grade provides broader coverage, while a larger grade creates greater particle exposure.

Can these large beads be used alone?

They can be used according to an approved project specification, but they are primarily positioned for use with another finer bead grade. Using only large beads may result in uneven coverage if the application rate and marking structure are unsuitable.

Can they be applied to thin cold paint?

They are generally more suitable for thick-layer thermoplastic markings. Thin paint layers may not retain 600–1400 μm particles securely.

Are these AASHTO Type III glass beads?

Not automatically. The 600–1400 μm particle range alone does not prove full compliance with AASHTO M247 Type III. Compliance must be supported by corresponding testing.

Are they suitable for wet-night road markings?

Large bead exposure may be useful when developing specialized reflective systems, but this product should not be marketed as wet-night certified without testing the complete marking system under wet conditions.

Can the gradation be customized?

Yes. Particle-size distribution and surface treatment can be discussed according to the marking thickness, dispensing equipment and project requirements.

📩 Request a Dual-Drop Recommendation

Please provide:

• Road marking material type

• Applied marking thickness

• Existing bead grade

• Dual-drop equipment configuration

• Required project standard

• Target retroreflectivity

• Destination market

A suitable combination of fine and large beads can then be recommended for the project.

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