What are reflective glass beads?
China Reflective Material Manufacture
2026-09-21
×
What are reflective glass beads?
Reflective glass beads are tiny spherical glass particles, typically ranging in diameter from tens of micrometers to a few millimeters. Its core characteristics are high refractive index and good optical performance, which can reflect incident light back along the original path, hence it is also known as "retro reflective glass bead" or "retro reflective glass bead".
Working principle: When light shines on the surface of a glass bead, it enters the interior of the sphere, undergoes refraction and internal reflection, and then returns to the light source along a path close to the incident direction. This characteristic allows it to produce a very striking bright light when illuminated by car lights or flashlights at night or in low light environments.
Parameters and types:
The performance of reflective glass beads is mainly determined by their refractive index.
| Type | Refractive index | Application |
| Low refractive index glass beads: | ≥ 1.50 | most commonly used type in road markings |
| Medium refractive index glass beads: | 1.70-1.90 | Signs, warning signs, billboards, etc |
| High refractive index glass beads: | ≥ 1.90, up to 2.2 or even 2.4. | The reflective effect is stronger, commonly seen on highway signs and high-end reflective clothing. |
Important parameters:
• Roundness rate: ≥ 80%, the higher the roundness, the better the reflective effect.
• Particle size: between 44 microns and 1400 microns.
• Main components: Sodium calcium glass, with a silicon dioxide (SiO ₂) content greater than 67%.
The main application scenarios of reflective glass beads include:
• Road markings: When mixed with road marking paint, the markings become clear and bright when illuminated by night lights, improving driving safety.
• Traffic signs and reflective film: used to make highway signs, warning signs, etc., enhancing long-distance visibility.
• Safety clothing: used for reflective vests, raincoats, firefighting suits, etc., to ensure the safety of night workers.
• Industry and Decoration: Used for sandblasting, grinding, decorative coatings, etc., as well as in some optical instruments and projection screens.
Frequently Asked Questions：
Q: What are retroreflective glass beads?
A: Tiny transparent glass spheres that reflect light back toward its source.
Q: How do they work?
A: Light refracts into the bead, reflects off its back surface, and refracts back toward the light source.
Q: What is retroreflection?
A: The phenomenon where light returns toward its source along the incident direction.
Q: Why are they used in road safety?
A: They reflect vehicle headlights at night, improving visibility of markings and pedestrians.
Q: Do they need power?
A: No. They are passive materials.
Our company not only produces Reflective Tape, but also Cloth Duct Tape,Gaffer Tape, Acrylic Foam Tape,Anti Slip Tape,Butyl Rubber Tape,Pavement Marking Tape, Glow In Dark Tape, etc,Looking forward to working with you.
recommended for you
Get in touch with us
Copyright © 2026 Kunshan Jieyudeng Intelligent Technology Co.,ltd - www.jerrytapevideo.com |Sitemap | Privacy Policy