Safety Goggle Selection - Jpg Download

Dear All
Can anyone please help me in making the concept clear about the Selction of Safety Goggles...
Normally description comes with the product saying 4DIN, in few 6DIN and upto 11DIN shades... What's exactly DIN shade conveying...
Which is suitable shade for specific purpose like Welding, Gas Cutting, Grinding Operation, Etc...
Is there any other factor we should consider while selecting the safety goggles?
Regards,
Dipil Kumar V
3rd September 2010 From India

Dear Dipil,
The DIN refers to the amount of light that can pass through the lens of the goggles. If it is 4, then the visibility range will be more ([I]more transparent[I]). As the value increases, its visibility level decreases & allows only the welding lights to be visible in its lens (not transparent)
For welding operations, 11 DIN would be best. For other operations, we need the proper visibility too. I don't know to give you teh correct value.
4 being the lowest (it is between 3 DIN to 14 DIN) & 11 being the highest of the shades commonly used.
Regards.
3rd September 2010 From India, Delhi

Dear Dipil,

I always appreciate the inquisitive nature of safety personnel. I consider it a privilege to impart what ever I have to help aspiring youngsters.

What Mr.KVS has answered is correct.

However being safety people we should be thorough as I always say. Let us try with a little more information.

It is not correct to think that the lens shade number corresponds to the amount of protection that is provided to the eyes. Because of this many assume that by using a shield of a higher shade number they get higher level of protection. Fact is all quality welding lenses filter out all the harmful ultraviolet (UV) and infrared (IR) wave length and provides perfect protection to the wearer. The shade number just denotes the amount of darkness provided by that particular shade lens. Shade number should be used by the welder only as a guide to select the one which most suits him and he is comfortable with and of course provides him with good visibility for the work at hand. Shade numbers also correspond with the amperage being set for the welding.

If you are uncertain as to what shade number to select for your work; of course, there are some suggested lens shade numbers that you can use as a guide.

Remember there are Ultraviolet (UV), Infrared (IR) and high intensity visible light to seek protection against.

I will pose the question on hazards and protection against UV, IR and high intensity light on concluding this issue.

We will wait for more contribution pl.

Regards,

Kesava Pillai
3rd September 2010 From India, Kollam

@ KVS & Kesav Pillai
Thanks for the great reply's...
I am looking forward to learn the hazards and protection against UV, IR and high intensity light...
What all activities needs eye protection and what shade number to select for the respective eye wear is still yet to get clarity...
Hope through more participation will come to a best conclusion...
Regards,
Dipil Kumar V
4th September 2010 From India

Dear All

I have discussed regarding the selection of Safety Goggle with one of the safety eye wear supplier and got the following write up:

Their product is made up of Polycarbonate lens and having exclusive scratch resistant lens coating... Available in clear and grey tints.

1. Clear Lens - Meant for applications which require a clear view such as for Machine operators and applications where no optical filtering is required.

2. Grey Lens - Offers Filtering of Visible Light upto 30% and 99% UV filtering.

3. Welding Lens DIN 5 - Meant for Gas welding applications (output of gas less than 40 lts/hr ).

As far as welding shade DIN 5 is concerned it can be used for gas and spot welding. Shade 11 is recommened for other welding processes.

Also got the attached test certificate of the product...

Can I suggest to purchase this product?

Whether polycarbonate lens will be the right type of lens for safety goggles?

How we can use a such a test certificate whihc is attached for the selection of safety goggles? Any other parameter left out which must be included in test certificate of a safety googles?

This test certificate contains nothing related to DIN? DIN value is suppose to be in the test certificate or not?

Looking forward to get a solution of my above quiries...

Regards,

Dipil Kumar V
7th October 2010 From India

Attached Files (Download Requires Membership)

Test Certificate.JPG (92.7 KB, 225 views)

Dear Dipil,

DIN is a European agency (German, I think) that sets standards for light sensing and light management equipment - such as film, filters, photocells, etc. Their ratings are different from the standards set by the American Society of Testing and Materials (ASTM) which you would see referenced in OSHA and ANSI.



Generally, in terms of filter media, the number represents a ratio of the amount of light that is allowed to pass through the media - the higher the number, the darker the shade.

American standards follow a measure of optical grade - from 1.25 to 32. Some common optical grades:

Grade 3 - used for very bright such as beaches, roofs, etc.

Grade 5 - used for extremely bright - such as snow, high altitude. The grade is also the lowest grade used for oxyacetylene cutting and low-grade welding, such as a spot welder.

Grade 7 - commonly used for oxyacetylene cutting, furnace inspections, boiler flame inspection

Grade 10 - 14 - specified for use for electrical arc welding, depending upon the size rod, arc voltage, length of exposure in an eight-hour work day, etc.

Grade 20 - Minimum recommended for momentary viewing directly at Sun, or at arc-flash / plasma phonomena.



I do not have a ASTM / DIN conversion chart. The OSHA and EM385 regulations specify certain grade (American standard) for certain types of work or exposures.



Hope this helps. . .

Thanks & Besafe

Raghu
8th October 2010 From United States, Fpo

Dear Dipil,

I had it already made clear that the shade numbers just denote the amount of darkness provided by that particular lens. Thus Din 2 – 14 just denotes the amount of darkness provided by that particular lens. It has absolutely no relevance to UV or IR protection. Depending up on the eye sight of user one may choose any shade -5, 14 or any other shade as one likes. There is no hard and fast rule with regard to this.

Polycarbonate is hard, impact resistant and nothing else. To get the same strength you may have to use 10 times thicker glass lenses. You may just take a 5 Kg. hammer, keep the polycarbonate lens on a flat surface and hit it hard. It will not break. Do not be afraid – you just try. You can even hammer a sharp nail through the polycarbonate lens. It will not scatter. Only thing is polycarbonate is not scratch free. The scratch resistance coating given is not that effective. Once the worker starts rubbing it with a cloth containing some gritty material it will start developing scratches.

Your test certificate is of no use. It has no ownership as I can see. There are testing houses like National Physical Laboratory and only such test certificates are acceptable. Some items are being tested by CLI too.

Specify your requirement. Where you want the safety goggles to be used and what are the hazards against which you require protective goggles? You need safety glasses or safety goggles?

In most places safety glasses are only primary protection. Along with this you may have to use face shield also for secondary protection as in the case of grinding, cutting etc.

If it is against impact polycarbonate is the best.

Scope of eye protection is so wide; it will take volumes to detail everything.

Let us deal with the minimum to satisfy the present need.

Regards.

Kesava Pillai
8th October 2010 From India, Kollam

@ KEshav Pillai

Dear Sir

Thanks for your explanations...

Actually we required Safety Goggles and for the following purpose:

1. Gas Cutting

2. Grinding

3. Chipping

4. General Purpose - For worn in dusty atmosphere

Sir could you please tell me what's the difference between safety glasses or safety goggles?

Then the test ceritificate which attached by me was an editted one which not reveals the identity... However I think there will be no issue in posting the orginal one which I received... Hence attaching the orginal one... It's tested by CLI... Please do let me know your comments please... How we can effectivly use such a test certificate in the selection of goggles?

I am having polycarbonate lens, and will surely conduct the experemen which you mention and let you know the results... However thanks to tell in detail about the properties of polycarbonate... The supplier is promoting the product by saying it's scratch resistant...

@ Raghu

Thanks for your inputs on the thread... It will surely help...

Regards,

Dipil Kumar V
9th October 2010 From India

Attached Files (Download Requires Membership)

RDS006 Test Report.jpg (111.7 KB, 90 views)

Dear Dipil,

1. You need eye protection for 1. Gas cutting, 2. Grinding, 3. Chipping and 4. General purpose where as you obtained test certificate from supplier/manufacturer for chemical splash goggles.

2. You want to know the difference between safety glasses and safety goggles.

1. Chemical splash goggles will not meet the requirements of eye protection for 1. Gas cutting, 2. Grinding, 3. Chipping and 4. General purpose. This certificate is for chemical splash goggles and as such it does not merit consideration here.

2. A pair of Safety Glasses is only a primary protection which requires use of a face shield along with it for grinding, chipping etc.

Contrary to what many safety people in the industry believe, safety glasses and safety goggles are not interchangeable, as there are a number of stark differences that separate the two.

Goggles are correctly considered to be safety glasses, yet safety glasses are not an appropriate substitute for safety goggles.

Safety goggles are like the oversized safety glasses, but have an extended protector that extends around the glasses and connects them to the cheek and brow.

While the lenses found on safety glasses and safety goggles tend to be made from the same type of shatter-proof, heat-resistant plastic, glass or polycarbonate the means by which they are attached to your head are noticeably different. Safety goggles are affixed to your head with an adjustable strap, which enables them to stay on more tightly than a typical pair of safety glasses.

Most people are aware of the immediate and apparent differences between safety goggles and safety glasses, with safety goggles often being designed along similar lines to ski goggles. Safety goggles offer complete protection from all angles, and provide effective protection in cases where sparks, liquid or fragments could strike the eyes from several different angles.

Safety glasses are just held on via two bulky earpieces, and because of their loose, bulky nature, safety glasses have a tendency to fall off at undesirable times

Safety glasses often don't provide much in the way of eye protection in situations where shards or fragments could strike the eye from underneath or from the side, and the same is true when it comes to liquids being splashed. If there is any risk of the eyes being damaged in such ways then it will be important to make sure that safety goggles are provided which offer this full protection from the front, the sides and both above and below the eye region.

Regards,

Kesava Pillai
10th October 2010 From India, Kollam

Dear dipil, Please find the attached i hope this can help u with ur quires. . . Wait for ur commands. . . Thanks & Besafe Raghu
11th October 2010 From United States, Fpo

Attached Files (Download Requires Membership)

Eye and Face Protection - 1.pdf (50.8 KB, 210 views)