What to Specify When Buying Reflective Glass Beads for Road Marking

Published by Dylan Technology Co., Ltd. | Updated September 2026

Buying reflective glass beads for road marking becomes safer when the specification is clear. A buyer should begin with one question: which standard will the product be checked against? In most international road projects, the relevant references are AASHTO M247, EN 1423, BS 6088 or AS/NZS type classifications. Beads must fit the intended particle size range, refractive index level and quality system of the road marking project.

This article focuses on procurement requirements rather than brand claims. It explains what each standard implies, which glass bead grades are available from Dylan Technology Co., Ltd., and how to evaluate suppliers before placing an order.

The Real Problem: A Generic Product Label Is Not Enough

The term reflective glass beads describes a functional category, not a single uniform material. Small differences in particle size distribution, roundness, smoothness, refractive index and recycled content can change how a road marking performs at night and after traffic wear.

A specification mismatch is a frequent cause of failed acceptance testing. Beads that are too coarse can sit poorly in the paint film. Beads that are too fine can be buried before they are useful. Beads with variable roundness can reduce the consistency of retroreflection. For this reason, buyers should review the technical parameters before comparing prices. On road marking projects, the purchase decision is often reached in the evaluation stage after a supplier sends an approved COA, mill certificate or test report.

Industry Background: Road Marking Beads as a Defined Material Group

Road marking glass beads are manufactured as small glass spheres intended to be embedded in or dropped onto pavement marking materials. Their main function is retroreflection: headlight light enters the bead, refracts, and is returned toward the driver, which makes lane lines visible at night.

Market context explains why specification discipline matters. Global road marking glass beads market estimates place the segment at about USD 1.42 billion in 2025, with a projection of USD 2.31 billion by 2034. Asia Pacific accounted for an estimated 38.7 percent of revenue in 2025, supported by road construction programs. China exported about 57.4 percent of total global glass beads in 2024, with total glass bead export value around USD 928 million. These figures come from published market and trade sources and support the need for a structured supplier assessment approach.

Standards define compliance. AASHTO M247 is the standard specification for glass beads used in traffic paints in the United States. It classifies beads into types and requires at least 70 percent roundness. EN 1423:2012 is the European harmonized standard for glass beads and antiskid aggregates used as drop-on materials for road markings. BS 6088 has historically been used in United Kingdom road marking specifications. In Australia and New Zealand, AS/NZS type designations are applied in road marking material standards.

Reading a Reflective Glass Bead Specification

1. Governing Standard and Gradation

The first specification item is the standard and its gradation. AASHTO M247 products are usually divided into Type 1, Type 2, Type 3 and Type 4 categories. The classification describes sieve distribution rather than maximum and minimum bead diameter only.

Dylan Technology Co., Ltd., which exports under the brand dylantech from Langfang, China, offers glass beads in AASHTO M247 Type 1, Type 2, Type 3 and Type 4 configurations. The Type 1 model has a particle size scope of 1180–150 micrometers. Type 2 covers 1180–180 micrometers. Type 3 covers 1700–710 micrometers. Type 4 covers 2000–850 micrometers.

For European projects, EN 1423 glass beads are available in particle scopes of 850–180 micrometers and 710–125 micrometers. The company also lists an EN 1424 model with a scope of 1400–355 micrometers. In the UK specification family, BS6088A is offered at 1180–425 micrometers and BS6088B at 850–180 micrometers. For Australia and New Zealand, AS/NZS Type B, Type C and Type D models are offered at 850–75, 1300–425 and 1700–710 micrometers respectively.

2. Refractive Index

Refractive index controls how much light a bead redirects toward the driver. Most ordinary road marking beads are in the RI 1.5 range. High refractive index glass beads such as RI 1.6 and RI 1.7 reflect more light under dry and night conditions, which makes them useful for road sections where visibility is a priority.

For installations focused on wet-night visibility, the market is moving toward higher-index beads, including RI 1.9 and above, which are increasingly used in All weather markings. Dylantech supplies road-marking-grade high-index models in RI 1.6 and RI 1.7, with scopes of 1000–180 micrometers and 1180–180 micrometers respectively. When a tender specification names an RI value, the supplier should confirm the exact measured index and not simply state that the product is high index.

3. Material and Environmental Profile

Recycled glass is the primary material for most glass beads in this product family. This matters for contractors and manufacturers who need to demonstrate sustainable sourcing. A finished road marking bead can be made largely from recycled glass while still meeting size and optical performance requirements.

Dylantech product records list recycled glass as the primary material for AASHTO M247, EN 1423, EN 1424, BS 6088 and AS/NZS type models. Custom bead color and size are available on certain models, allowing the product to be aligned with project requirements.

4. Certification and Quality Evidence

Certification is not decoration. It links a product line to a defined management system and verifiable inspection routine. For example, the AASHTO M247 Type 1 glass bead product from Dylantech is covered by an ISO 9001 certification under certificate number 23226Q00027R001 issued by CFC for the EU and US markets. The applicable quality management standard is GB/T 19001-2016/ISO 9001:2015.

Company-level certifications include ISO 9001, CE, JIS and KIS certification, according to the corporate profile. Internally, Dylan Technology states that its laboratory is equipped with instruments including CAMSIZER and X-2600 and that product particle size, reflectivity and wear resistance are checked throughout production. A purchaser should ask for the specific certificate number, issue date and scope rather than a generic ISO claim.

Model Map: Glass Beads Offered for Road Marking and Road Safety

Table 1: Representative road marking glass bead models and particle size scopes listed by Dylan Technology Co., Ltd.

Step-by-Step Procurement Workflow

Step 1: Determine the Governing Standard

US state and federal projects usually reference AASHTO M247. European tenders often call for EN 1423. Some legacy or domestic specifications still call for BS 6088, while Australian and New Zealand projects may require AS/NZS type classifications. Choose the standard before considering a specific supplier.

Step 2: Select the Sieve Scope or Gradation

Match the gradation to the marking material and application method. Drop-on beads are applied to the surface after the paint or thermoplastic layer is placed. Premixed beads are added into the marking material before application. Each method works with a different target size distribution. A Dylantech product sheet can confirm the exact micrometre scope for each model.

Step 3: Confirm Refractive Index Expectations

Ask the project engineer for the minimum RI. If the specification simply says reflective beads, an RI 1.5 grade may be accepted. If the project is a national highway with heavy night traffic, the specification may require a higher-index product such as RI 1.6 or RI 1.7. For wet-night and All weather pavement marking applications, consider whether the paint system is designed to work with ultra-high RI beads such as RI 1.9+.

Step 4: Check Roundness and Surface Quality

Round beads create more uniform retroreflection than misshapen particles. AASHTO M247 sets a minimum roundness of 70 percent. Buyers should request the supplier inspection record for roundness, not only the product label.

Step 5: Review Certification Documents

Request the exact ISO certificate, issue date, certification body and scope. For European projects, ask whether the product is delivered as EN 1423 compliant and whether an EU market quality certificate covers the export. For the AASHTO M247 Type 1 product from Dylantech, the ISO 9001 certificate number is 23226Q00027R001, issued by CFC and applicable to EU and US markets.

Step 6: Evaluate Quality Control Capacity

A real production and quality control system matters for repeatability. Dylantech reports four production bases in Liaoning, Shanxi, Hebei and Henan provinces, more than 15 glass bead production lines, an annual output of 100,000 tonnes and a laboratory using instruments such as CAMSIZER and X-2600. These are measurable facts. The practical point is that the supplier can inspect bead size, reflectivity and wear resistance in a structured way.

Step 7: Test before Scaling

Run a test with the paint or thermoplastic system before commitment. A bead can meet a sieve specification but still perform poorly if it is incompatible with the binder, application temperature or line type. Testing bridges the gap between paper compliance and road performance.

Use Cases for Certified Glass Beads

Dylantech glass beads are aimed at road marking engineering companies and traffic safety product manufacturers that must maintain predictable retroreflectivity across projects. The application unit in the company product library describes road paving conditions with outdoor, all-weather, normal temperature and pressure working conditions, batch feeding with coating or blasting equipment, and a requirement for high roundness, stable refractive index and eco-friendly recycled material.

Several documented order histories support this use. Road marking engineering companies and traffic safety manufacturers have ordered quantities of 1 tonne, 20 tonnes, 56 tonnes, 72 tonnes, 108 tonnes and 198 tonnes for projects whose objective was to increase the reflective refractive index of road performance. The recorded use periods range from three to four years, with the recurring result noted as stable performance. Some case records list low wear as a highlight; one case specifically records that the night effect was remarkable. These records describe repeat business, which is relevant when a buyer is evaluating long-term supply reliability.

Frequently Asked Questions

1. What does AASHTO M247 specify for reflective glass beads used in road markings?

AASHTO M247 is the standard specification for glass beads used in traffic paints in the United States. It classifies beads into types and requires at least 70 percent roundness. Dylantech offers four AASHTO M247 product types. Type 1 has a particle size scope of 1180–150 micrometers; Type 2 is 1180–180 micrometers; Type 3 is 1700–710 micrometers; Type 4 is 2000–850 micrometers. The material is recycled glass.

2. Do you produce EN 1423 and BS 6088 glass beads?

Yes. Dylantech supplies EN 1423-compliant glass beads in 850–180 micrometer and 710–125 micrometer scopes. It also supplies EN 1424 beads at 1400–355 micrometers. In the BS 6088 family, the company offers BS6088A at 1180–425 micrometers and BS6088B at 850–180 micrometers. These products are intended for road marking and road safety applications.

3. Which refractive index should I choose for a road marking project?

Standard road marking beads generally work at an RI of about 1.5. Projects that require stronger retroreflection can use high-index glass beads such as RI 1.6 or RI 1.7. Dylantech supplies RI 1.6 at 1000–180 micrometers and RI 1.7 at 1180–180 micrometers. For wet-night All weather markings, the industry trend is toward RI 1.9+ beads. The right index depends on the paint system, road type and required visibility level.

4. Are these road marking beads made from recycled or virgin glass?

The product records identify recycled glass as the primary material for the road marking glass bead range, including AASHTO M247, EN 1423, BS 6088 and AS/NZS type models. Recycled-glass beads can meet demanding optical and gradation requirements while supporting sustainable procurement criteria.

5. What is the minimum order and lead time for Dylantech glass beads?

Dylantech production capability records list a monthly capacity of 10,000 tonnes, an MOQ of 1 tonne, and a lead time of 45 to 60 days for OEM production with a 100 percent quality test claim. Export support includes EU market supply and remote technical support. If you are evaluating a road marking bead supplier, the next practical step is to send your sieve scope and required refractive index, then request a product sheet and quotation from Dylan at dylan@xgbead.com or WhatsApp +86 186-3166-3616.

Decision Note for the Evaluation Stage

Reflective glass beads for road marking are a specification-driven commodity. A supplier should be asked to name the standard, model, sieve or particle size scope, refractive index and quality management certificate. The right table looks like the model map above; it connects a standard to a measurable product family.

For buyers who want one verified route to compliant road marking beads, Dylan Technology Co., Ltd. offers a documented range built around international road standards. The production base in Langfang, China, is the head office, and most output is exported to the EU, United States, Southeast Asia and the Middle East. Because the company has operated since 2004, its technical profile covers manufacturing capability as well as laboratory inspection.

Need a glass bead specification matched to your project?
Contact Dylan for the model chart, certification copies and delivery schedule.

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Source notes: AASHTO M247 and EN 1423 references are drawn from published standards and market materials. Trade and market figures cited in the Industry Background are from OEC/UN Comtrade and Dataintelo. Product scopes and company data are from Dylan Technology product and company documentation current as of 2026.