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GB/T 32166.2-2015 English PDF (GBT32166.2-2015)

GB/T 32166.2-2015 English PDF (GBT32166.2-2015)

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GB/T 32166.2-2015: Personal protective equipment -- Eye and face protection -- Occupational eye and face protectors -- Part 2: Test methods

This part of GB/T 32166 specifies the optical and non-optical performance test methods for occupational eye and face protectors. This part applies to zero diopter protectors or components used in industry to protect the eyes or face. This part does not apply to the testing of prescription ocular and prescription assembled ocular.
GB/T 32166.2-2015
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 13.340.20
C 73
Personal protective equipment - Eye and face
protection - Occupational eye and face protectors -
Part 2: Test methods
ISSUED ON: DECEMBER 10, 2015
IMPLEMENTED ON: NOVEMBER 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 General ... 5
4.1 Test environment ... 5
4.2 Test headform ... 5
4.3 Reference point (for testing) ... 5
5 Test method of optical performance ... 7
5.1 Spherical power, astigmatic power, prismatic deviation ... 7
5.2 Prism imbalance of assembled ocular or ocular covering both eyes ... 9 5.3 Transmittance ... 10
5.4 Wide angle scatter (haze) ... 11
5.5 Narrow angle scatter (light diffusion) ... 11
5.6 Material and surface quality test ... 18
6 Test methods of non-optical performance ... 19
6.1 Impact resistance test ... 19
6.2 Thermal resistance test ... 22
6.3 UV radiation stability test ... 22
6.4 Corrosion resistance test ... 23
6.5 Flame retardance test ... 24
6.6 High-speed particle impact resistance test ... 24
6.7 Heavy object impact resistance test ... 26
6.8 Anti-drop performance test (suitable for goggles protector) ... 27 6.9 Ocular surface wear resistance test ... 28
6.10 Ocular anti-fogging performance test ... 31
References ... 34
Personal protective equipment - Eye and face
protection - Occupational eye and face protectors -
Part 2: Test methods
1 Scope
This part of GB/T 32166 specifies the optical and non-optical performance test methods for occupational eye and face protectors.
This part applies to zero diopter protectors or components used in industry to protect the eyes or face.
This part does not apply to the testing of prescription ocular and prescription assembled ocular.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 2410 Determination of the luminous transmittance and haze of
transparent plastics
GB/T 23461-2009 3D dimensions of male adult headform
GB/T 30042-2013 Personal protective equipment - Eye and face protection - Vocabulary (ISO 4007:2012, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 30042-2013 apply to this document. 4 General
4.1 Test environment
Unless otherwise specified, all tests in this part shall be conducted in an indoor environment at a temperature of (23 ?? 5) ??C and a humidity of 30% ~ 80%. 4.2 Test headform
The test headform shall meet the requirements of the three-dimensional size of the adult male headform in GB/T 23461-2009. Unless otherwise specified, the surface material of the test headform in this part is polyurethane; the base material of the headform is metal.
4.3 Reference point (for testing)
During the test, the test shall be conducted at the design reference point indicated by the product. If the product does not indicate the design reference point, the test reference point shall be determined as follows:
a) Unassembled ocular covering single eye - For the ocular which covers single eye and are unassembled on the frame, the test reference point is placed at the intersection R of the horizontal centerline and vertical
centerline as indicated in Figure 1 (R is the center of the rectangle, ?? is the horizontal size of the ocular rectangle, b is the vertical size of the ocular rectangle).
b) Unassembled ocular covering double eye - For the ocular which covers double eyes and are unassembled on the frame, the test reference point
R is on the horizontal center line of the ocular and is away from the vertical center line by PD/2 (PD is the interpupillary distance, b is the ocular height, as shown in Figure 2).
c) Assembled ocular - For the ocular assembled to the frame or as an integral part of eye protector, the test reference point R is located at the wearing position at the intersection of the horizontal line of sight and the ocular (as shown in Figure 3).
5 Test method of optical performance
5.1 Spherical power, astigmatic power, prismatic deviation
5.1.1 Focimeter method
5.1.1.1 Instruments
Qualified focimeter.
5.1.1.2 Test procedure
After confirming the reference point according to 4.3, place the back surface of the specimen on the support of focimeter and make the reference point on the optical axis of the focimeter. Then perform the test.
5.1.2 Telescope method
5.1.2.1 Instruments
Instrument composition:
a) Telescope: Use a telescope which has a nominal aperture of 20 mm, a
magnification of between 10 and 30 times, a reticle and an adjustable
eyepiece;
b) Target board: As shown in Figure 4, the target board is a black sheet with a cutting pattern. Place a light source with adjustable luminance and a condenser behind the target board. If necessary, it may focus the enlarged image of the light source on the objective ocular of the telescope. The outer ring?€?s diameter of the large ring of the target board is (23.0 ?? 0.1) mm, the ring hole is (0.6 ?? 0.1) mm; the inner ring?€?s diameter of the small ring is (11.0 ?? 0.1) mm, the ring hole is (0.6 ?? 0.1) mm. The diameter of the center hole of the target board is (0.6 ?? 0.1) mm. The nominal length of the long plate target is 20 mm; the width is 2 mm; the interval is 2 mm; c) Filter: In order to introduce chromatic aberration, it may use a filter which has peak transmittance in the green light spectrum;
d) Calibration lenses: Use positive and negative calibration lenses with spherical powers of 0.06 m-1,0.12 m-1, 0.25 m-1 (tolerance is ?? 0.01 m-1). to ensure the accurate determination of the solid angle ??, the measurement error of the ring diameter of the ring diaphragm shall not exceed 0.01 mm, meanwhile any deviation from the nominal diameter shall be corrected in the calculation.
5.5.3.2 Test procedure
During the test, after determining the reference test point according to 4.3, first place the specimen in the parallel beam at position P in Figure 7. Make the reference point on the optical axis of the tester. At the same time, select the BL circular diaphragm. The luminous flux ??1L as obtained from the photoelectric detector corresponds to the luminous flux of non-scattered light transmitted through the specimen. Then change the BL circular diaphragm into the BR circular diaphragm. The photoelectric detector detects the scattered light?€?s flux ??1R as caused jointly by the specimen and the device. Finally, place the specimen in the P' position. The photoelectric detector detects the scattered light?€?s flux ??2R which is caused only by the device. The difference (??1R - ??2R) represents the scattered light as generated by the tested specimen. The average reduced luminance coefficient within the solid angle ?? is calculated according to formula (2):
Where:
l* - The reduced luminance coefficient, in candela lux per square meter [cd / (m2 ?? lx)];
??1R - The luminous flux of the ring diaphragm when the specimen is at the P position, in lumens (lm);
??2R - The luminous flux of the ring diaphragm when the specimen is at the position P', in lumens (lm);
??1L - The luminous flux of the circular diaphragm when the specimen is at the P position, in lumens (lm);
?? - The solid-angle, which is determined by the ring diaphragm, in spherical power (sr).
Explanation:
L - Laser light source which has a wavelength of (600 ?? 70) nm;
Note: It is recommended to use category 2 laser products, which has a power of less than 1 mW and the beam diameter of 0.6 mm ~ 1.0 mm.
L1 - Lens which has a nominal focal length of 10 mm;
L2 - Lens which has a nominal focal length of 30 mm;
B - Circular diaphragm (aperture is 0.1 mm, which can produce a uniform beam); P - Specimen;
BR - Ring diaphragm, which has an outer ring diameter of (28.0 ?? 0.1) mm and an inner ring diameter of (21.0 ?? 0.1) mm;
BL - Circular diaphragm which has a light transmission diameter of 10 mm; A - Lens which has a nominal diameter of 30 mm and a nominal focal length of 200 mm; S - Photoelectric detector.
Figure 8 -- Narrow angle scatter tester (simplified method)
5.5.4.2 Test procedure
5.5.4.2.1 Reduced luminance coefficient of instrument
The reduced luminance coefficient of the instrument is tested as follows: a) During the test, the specimen to be tested is not placed at P, whilst the ring diaphragm BR is placed at the position as shown in the Figure;
b) Rotate the detector S, lens A and ring diaphragm BR horizontally with P as the center, until the extended beam passing through L1, L2 and B is in the same straight-line with the center of the ring diaphragm BR; the luminous flux ??1R as measured on the detector S is the scattered light flux of the instrument itself;
c) Replace the BR ring diaphragm with a BL circular diaphragm; the luminous flux ??1L as measured on the detector S is the total non-scattered light energy.
The reduced luminance coefficient l*q as generated by the instrument is calculated according to the formula (3):
Where:
l*a - The reduced luminance coefficient of the instrument, in is candela lux 5.6.2 Test procedure
The human eye is about 700 mm away from the dark box?€?s background. Turn on the fluorescent lamp in the dark box and place the ocular to be tested 400 mm away from the dark box?€?s background. Adjust the opaque shading plate between the ocular and the fluorescent lamp, to obtain the best luminance of the ocular while avoiding the light source directly hits the human eye. Then visually inspect the material and surface quality of the area within 5 mm of the ocular edge.
If there is any disagreement on the test results of the material and surface quality, it may use a beam which has a nominal diameter of 5 mm to irradiate the area with the disagreement, to test its refractive power value (see 5.1), transmission value (see 5.3), light scattering value (see 5.4 and 5.5) . 6 Test methods of non-optical performance
6.1 Impact resistance test
6.1.1 Oculars
6.1.1.1 Instruments
The test instrument is as shown in Figure 10. The basic structure can be divided into upper and lower parts. The upper half is the elevation column. The part connected to the elevation column is the positioning ruler, which can be adjusted freely and slide freely up and down. The required height can be positioned by a fixing bolt. The outer end of the positioning ruler has a steel ball feeding hole. A collimated laser is fixed directly above the hole center (recommended to use category 1 or 1M laser products), which is used for aligning the center of the steel ball feeding hole and the center of the tested specimen. The lower part is the specimen base, which is composed of a steel cylinder and a pressure ring. The inner diameter of the cylinder is about 5 mm smaller than the diameter of the ocular to be tested. The mass of the pressure ring is about 250 g. The inner diameter is the same as the inner diameter of the cylinder. The outer diameter is slightly larger than the cylinder. A rubber washer which has a thickness of about 3 mm and an international rubber hardness of (40 ?? 5) IRHD is placed on the upper and lower surfaces of the ocular to be tested, respectively; its inner diameter is the same as that of the cylinder. For oculars with curvature, the curvature of the cylinder and the pressure ring shall be consistent with the concave and convex surfaces of the ocular, respectively. a piece of white paper and carbon paper between the headform and the
specimen. The white paper is on the side of the headform and the carbon paper is on the side of the ocular. The steel ball feeding point is right above the specimen. The effective range of steel ball hitting the specimen is a circular area with a radius of 10 mm centered on the test reference point as determined in 4.3c). If the specimen has side protection, the side shield shall also be subjected to an impact test. The effective range of the steel ball impacting the side shield is the circular side protection area with a radius of 10 mm centered on the outer corner of the headform eye.
The impact test is carried out after pretreatment under the following conditions: a) The specimen is heated to (55 ?? 2) ??C and kept at this temperature for at least 1 h;
b) The specimen is cooled to (-5 ?? 2) ??C and kept at this temperature for at least 1 h.
Each impact test and each pretreatment condition shall use a new specimen. The test shall be carried out within 30 s after the completion of thermal- insulation.
6.2 Thermal resistance test
6.2.1 Instruments
Oven, the temperature in the oven shall be uniform and maintained at (55 ?? 2) ??C.
6.2.2 Test procedure
First adjust the temperature in the oven to (55 ?? 2) ??C. Then put the specimen into the oven. The ocular surface shall not contact the oven wall. After keeping the temperature for (60 ?? 5) min, take out the specimen and place it under normal temperature for at least 60 min. Perform visual inspection.
6.3 UV radiation stability test
6.3.1 Instruments
The design of the ultraviolet irradiation box shall be reasonable, to ensure that the ocular surface is perpendicular to the ultraviolet irradiation direction. The ocular does not touch the inner wall of the box.
The source of ultraviolet radiation shall be a high-pressure xenon lamp. Under working conditions, the pressure of the xenon gas in the lamp shall be stabilized Immerse it in a 10% (mass solution) sodium chloride (NaCl) boiling water solution. After soaking it for 15 min, take it out of the boiling water solution. Then immerse it in 10% (mass fraction) sodium chloride (NaCl) water solution at room temperature. After soaking it for 15 min, take it out and do not wipe off the adhesive solution. Put it at room temperature for 24 hours. Then use warm water to wash the metal parts and wait for it to dry. Visually check whether the surface has oxidation.
6.5 Flame retardance test
6.5.1 Instruments
Test instruments include:
a) A steel rod which has a length of (300 ?? 3) mm and a diameter of 6 mm, with a flat bottom perpendicular to the axial direction of the steel rod; b) Heat source;
c) Thermocouple thermometer and display device;
d) Timer, which has a maximum allowable error of ?? 0.1 s.
6.5.2 Test procedure
Heat one end of the steel rod. The steel rod with a length of at least 50 mm shall reach (650 ?? 20) ??C. The temperature measurement point is (20 ?? 1) mm from the heating end of the steel rod. Put the steel rod in vertical contact with the surface of the specimen, without applying external force. Remove the steel rod after (5.0 ?? 0.5) s.
After removing the steel rod, observe whether the specimen has continued burning or smoldering.
Except for the elastic headband and the fabric at the edges, all exposed parts of occupational eye and face protector shall be subjected to this test. 6.6 High-speed particle impact resistance test
6.6.1 Instruments
The test instrument consists of a launcher, a timer, a headform, as shown in Figure 12.
The launcher is mainly composed of a steel tube of appropriate size. It shall a) A circular area with a radius of 10 mm centered on the reference point determined by 4.3c);
b) A circular side protection area with a radius of 10 mm centered on the outer corner of the headform eye.
A new specimen shall be used for each impact test.
6.7 Heavy object impact resistance test
6.7.1 Instruments
Fix the headform horizontally on a base larger than 30 kg. The hardness of the headform needs to be able to withstand 20 kg of vertical downward pressure on the forehead; the back of the headform cannot be inclined more than 2 mm. The impactor needs to be made of stainless steel, with a 30?? conical head, a ball diameter of 3.175 mm, a mass of g, a diameter of 25.4 mm, as
shown in Figure 13. The impactor shall be placed at a height of 1270 mm right above the headform with the tip facing down. Care must be taken to maintain the tip structure and the mass of the impactor.
The impactor shall fall freely from a loose-conducting tube with a uniform inner diameter, to prevent the tilting or runaway of the impactor.
6.7.2 Test procedure
Put the specimen to be tested on the headform according to the normal wearing position. Adjust the tightness of the specimen?€?s headband according to the product manual. When the impactor falls, the impact point needs to be in line with the center point of any eye of the headform. In order to protect the test personnel, the casing shall be fixed and the height of the lower end of the casing from the impact point is 180 mm.
The effective range of the impact specimen is a circular area with a radius of 10 mm centered on the reference point determined by 4.3c).
A new specimen shall be used for each impact test.
6.8.2 Test procedure
Put the specimen to be tested on the headform wrapped with absorbent cotton in the normal use position. Put the blotting paper soaked with indicator between the absorbent cotton cloth and the specimen. Spray 5 mL ~ 10 mL of sodium carbonate solution which has a concentration of 0.1 mol/L, until the blotting paper at the edge of the specimen becomes a uniform deep red. The sprinkler and the headform are separated by 600 mm; the headform is sprinkled from all directions. Then, check whether the parts inside the two circles on the blotting paper change color.
6.9 Ocular surface wear resistance test
6.9.1 Instruments
The sand falling test instrument is as shown in Figure 14.
6.9.2 Cleaning of specimen
Oculars shall be cleaned using the cleaning method recommended by the
product. If it does not recommend the cleaning method for the product, it may use an aqueous solution of detergent at a concentration of (1.0 ?? 0.2)% to clean the ocular. The temperature of the cleaning solution should be (27 ?? 3) ??C. Then use distilled water to rinse the residual solution on the ocular. Finally, use a clean cloth or ocular paper to wipe off the moisture on the ocular.
The cleaned specimen shall not be contaminated or damaged.
6.9.3 Test procedure
Choose a suitable shape of the specimen. It shall fix the specimen on the ocular holding bench as shown in Figure 14. When the turntable rotates, the abrasive drops. After all the abrasive drops, remove the ocular and clean the ocular according to the method in 6.9.2. Then use the method as specified in 5.4 to measure its wide angle scatter or use the method as specified in 5.5 to measure its narrow angle scatter.
6.9.4 Test conditions
Test conditions include:
a) The abrasive?€?s mass is 400 g;
b) The amount of abrasive drop is about 60 g/min ~ 80 g/min;
c) The abrasive shall fall vertically at the center of the ocular and be at 45?? to the ocular surface;
6.10 Ocular anti-fogging performance test
6.10.1 Instruments
This test instrument is used to determine the change of the non-scattered light transmittance of the ocular, as shown in Figure 15.
The nominal diameter of the parallel beam is 10 mm; the choice of beam splitter, receiver, lens L3 shall ensure that the 0.75?? scattered light is ca...

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