StraightlinesUK.com Safety Specs Frequently Asked Questions

All models manufactured by Straight Lines Trading Company Ltd have anti-fog coated lenses as standard.

Yes, you can have any of the safety specs manufactured by Straight Lines Trading Company Ltd personalised. Min Order 500 pieces.

All safety glasses supplied by Straight Lines Trading Company Ltd are made from Polycarbonate, this is a very tough material. The impact resistance of a Polycarbonate lens is approximately ten times higher that of a safety glass lens made from hardened glass.

Polycarbonate is used in many applications, such as "bullet proof" windows, and in other applications requiring great flexibility and strength. This material can be moulded in opaque or clear material. In clear form it is an excellent material for optical lens manufacturing. Most safety glass lenses are today made from Polycarbonate.

Polycarbonate gains its strength from being flexible instead of rigid. Because of this Polycarbonate lenses are prone to scratching, and are therefore protected by a hard coating. Even with a hard coating Polycarbonate has to be handled carefully, and should cleaned with soap and water and dried with paper tissue. If your work environment is dusty and abrasive, you may want to consider safety glasses with hardened glass lenses, since they offer better scratch resistance than Polycarbonate lenses. Safety glasses with glass lenses are usually more expensive, and are not available in contemporary fashion styles. Straight Lines Trading Company Ltd does not offer safety glasses with hardened glass lenses.

Several models in our product line offers both angle and length adjustment of the temples. The angle adjustment allows the lens to be tilted so that it offers the best possible protection for the job at hand. This feature is also helpful for individuals with asymmetric faces (it is common that the right and left ears are at different heights)

How are Straight Lines Trading Company Ltd safety glasses tested, and to what standards?

Safety glasses are tested to EN166 and ANSI Z87.1-2003. This standard includes optical requirements as well as physical requirement. Here is a list of the tests that are required:

Test Performed	Description
High Mass Impact	Frame shall be capable of resisting impact from a pointed projectile weighing 500g (17.6 oz.) dropped from a height of 127 cm (50 in.).
High Velocity Impact	Spectacles shall be capable of resisting impact from a 6.35 mm (1/4 in) diameter steel ball traveling at a velocity of 45.7 mps (150 fps). For sample size of 20, no failure may occur.
Drop-Ball Impact	Basic impact requirement for all devices: 1 inch diameter steel ball dropped at 127 cm (50 inches)
Penetration Test (Plastic lenses only)	Spectacles shall be capable of resisting penetration from a weighted projectile weighing 44.2 g (1.56 oz dropped from a height of 127 cm (50 in).
Prismatic Power	The prismatic power shall not exceed 1/2 prism diopter in any direction. Vertical and horizontal prism imbalance shall not exceed 1/4 prism diopter....
Refractive Power and Astigmatism	The refractive power in any meridian shall not exceed 0.06 diopter. The astigmatism shall not exceed 0.06 diopter.
Haze	Lenses shall not exhibit more than 3% haze, when tested in accordance with....
Optical Quality	No striae, bubbles, waves or other visible defects that would impair optical quality is allowed.
Transmittance	Clear and filter plano lenses shall comply with table one of Z87.1. Special purpose lenses shall comply with Table 2.
Cleanability	After cleaning the function of the spectacles shall not be impaired.
Markings	Lens: Manufacturers mark, and if applicable "S" for lenses with less than 85% visible light transmission. High velocity spectacle removable lenses shall be marked with manufacturers symbol and +. Frame components: All major components shall bear Manufacturers mark and shall be marked "Z87"


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