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Glossary |
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Refractive Index: The refractive coefficient of
glass bead to light. They are divided into series of 1.5Nd,
1.9Nd,2.2Nd. Nd is the unit of refractive index. |
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Roundness Ratio:
It means the percentage of round glass bead with
total glass bead.
The higher value, the better quality.
Opacity: It
means the percentage of nontransparent glass bead with total
glass bead. The lower value, the better quality.
Retro-reflection:
When the light illuminates surfaces, if the light returns
its source, it will be retro-reflection. When the objects
have more than 1.9Nd refractive index, there will be formed
retro-reflection. |
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 ¡°Encapsulated-Lens¡±
type retro-reflective articles: A cover film
disposed in front of the glass bead, and on the front of the
glass bead while retaining their air-incident interface so
as to maintain the necessary optical relationships for
retro-reflective.
High intensity grade reflective sheet belongs to this type.
Said glass bead are 1.9nd glass bead.
¡°Enclosed-Lens¡±
type retro-reflective articles: A cover film
disposed in front to the glass bead so that said bead do not
exposed in air. Engineering Grade and Super Engineering
Grade belong to this type. Said glass beads are 2.2nd glass
bead.
¡°Exposed-Lens¡± type
retro-reflective articles: Glass beads are in the
surface of reflective article and exposed in air. Reflective
fabric, reflective leather, reflective ink and reflective
paint belong to this type. Said beads are 1.9Nd glass bead.
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