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ACRYLIC MATERIAL
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Whereas polycarbonate (PC) is the choice for maximum protection, Acrylic" (or PMMA as it 's technically known) is commonly used in sunglass lenses when cost and not impact protection is the main concern. Not as impact resistant as PC Acrylic does offer certain benefits to the consumer. The material is very hard and has very good mechanical stability. It has an index @588nm of 1.49, and an Abbe number of 55.3. Acrylic is also known for its very good clarity and excellent transmission properties throughout the visible portion of the spectrum.
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- Slightly higher transmission approx 3-5 % ( clearer lens)
- Glossy shiny appearance
- More scratch resistance
Whereas traditionally PC lens material has an inbuilt UV absorber as standard, you should not automatically accept that the AC used on your lens will also give the same kind of protection. When buying AC lens
always specifically request that the lens have been made with a UV400 absorber
added.
Added in during the lens manufacturing process , UV400 absorber will ensure that your lens offers full UV protection. ( the absorbers are mixed with the material, and unlike UV coatings will not wear off
TECHNICAL DESCRIPTION
An amorphous, transparent and colorless thermoplastic that is hard and stiff but brittle and notch-sensitive. It has good abrasion and UV resistance and excellent optical clarity
Half the weight of glass
Fairly Impact Resistant
Unaffected by sun or salt spray
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Chemical Resistance
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Acids - concentrated
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Fair
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Acids - dilute
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Good
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Alcohols
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Fair
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Alkalis
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Good
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Aromatic Hydrocarbons
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Poor
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Greases and Oils
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Poor
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Halogens
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Poor
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Ketones
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Poor
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Physical Properties
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Abbe Number
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55
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Density ( g cm-3 )
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1.19
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Flammability
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Combustible
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Limiting Oxygen Index ( % )
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17-20
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Refractive Index
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1.49
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Resistance to Ultra-violet
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Good
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Water Absorption - over 24 hours (
% )
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0.2
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Cleaning
Wash with mild soap or detergent, with plenty of lukewarm water, dry with soft cloth or chamois.
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ABOUT
US│LENS--
colors
and filters lens dimensions
│
OPTILUX-- Introduction Lens availability
Lens performance standard
│
│PROTECTIVE
EYEWEAR-- Industrial
Sports
│ COATINGS--anti-scratch anti-fog
dual
coating anti-reflective
│
│MATERIALS--polycarbonate
acrylic
nylon
│
│PRODUCT STANDARDS--standards
test
facilities FAQ---Protective
/ Lens
│
│NEW
│CONTACT
US│ACCREDITATION│COATINGS
PAGE--Protective
eyewear Lens
│ |
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FORESIGHT OPTICAL
LTD.
7 SHIN HO ROAD, TAINAN, TAIWAN,
R.O.C.
TEL : 886-6-2637562 FAX : 886-6-2610524
886-6-2657593-5
E-mail : jf007@ms14.hinet.net |
FORESIGHT OPTICAL
(XIAMEN) LTD.
19 GUANGHUA ROAD, XINGLIN IND. PARK.
XIAMEN, CHINA.
TEL : 86-592-621-8218
FAX : 86-592-621-8266
E- mail : fosight@public.xm.fj.cn
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