What are the main contents of bidding for dust masks? How can I write the bidding requirements suitable for dust masks?

How to write the bidding documents for dust masks? And the bidding demand for dust masks?

Occupational safety protection has become a difficult problem that affects the normal development of enterprises and restricts work efficiency. A good protective mask can not only ensure the long-term development of enterprises, but also protect the occupational health of employees and improve work efficiency.

After the dust mask was changed from GB2626- 1992 to the newly issued GB2626-2006 "Breathing Protective Articles Self-priming Filter Anti-particulate Respirator", many purchasers did not know how to write the bidding documents for dust masks, and the vague bidding requirements for dust masks would bring great confusion to the later procurement.

By analyzing the details of the national standard, how to write the bidding documents for dust masks is no longer a problem. (According to the current standards, dust masks should be called anti-particle respirators.)

First of all, you should know the necessary knowledge of respiratory protection. Respiratory protection is divided into:

Particle prevention (oily particles and non-oily particles)

B against harmful gases (organic gas, ammonia gas, acid gas or various harmful gases) C against various harmful gases. D. Prevention of harmful gas+particles

Particulate matter classification

powder

dust

dust

kind

Category subdivision

explain

Applicable products

And the environment

inorganic

dust

Mineral powder

Such as sand, asbestos, talc, coal, graphite, rocks, etc.

Suitable for KN protection products.

Coal mine, non-coal mine, silica sand, grinding, electrolytic aluminum, welding, casting, shipbuilding, metallurgy, tunnel, machining, construction, building materials, ceramics, tires, rubber, grinding, feed, medicine, thermal power plant, stone carving, carbon black, etc.

metallic dust

Iron, aluminum, tin, copper, lead, zinc, manganese, rare earth, etc.

Artificial inorganic dust

Cement, synthetic diamond, ceramics, alloy materials, glass fiber, etc.

organic

dust

Animal dust

Hair, feather, silk, bone (powder), shell powder, etc.

Plant dust

Cotton, hemp, grain, hay, wood, pollen, robes, etc.

Artificial organic dust

Explosives, organic dyes, artificial fiber dust, plastics, etc.

Mixed dust

All kinds of dust mentioned above are mixed together, which is the most common in the production environment. To judge the harm of mixed dust to human body, we must first understand its chemical composition and its proportion, and the main harm is the one with great harm and large proportion.

smoke

lampblack

Fine and loose black soot deposited by incomplete combustion of oils, and the particle size of soot is 0.0 1 micron -0.3 micron.

KP class. Coal tar, asphalt smoke, etc.

smoke and dust

As a result of oxidation, sublimation, evaporation and condensation, solid particles suspended in gas are called soot.

KN level. Welding smoke, lead smoke and some burning smoke.

fog

oil fog

Liquid oil is atomized into small particles of 1um-3um, which are suspended in the air to form a mixture (oil mist).

KP class. Plane grinding, diesel smoke and other environments.

fog

Water vapor near the ground, small water droplets floating in the air after being condensed by cold.

KN level. Environment with biological pesticides and slight water mist.

microorganism

Bacteria, viruses, fungi and some small protozoa, microalgae, etc.

KN level.

dust

size

visible

Refers to the dust with a particle size greater than 10μm and visible to the naked eye. Produce large particles such as sawdust, feed, flour and other environmental uses.

KN90、KN95。

Show minutes.

Refers to the dust with the particle size of 10um-0.25μ m that can be seen by an optical microscope. The most common.

KN 100 .

ultramicroscopy

Refers to the dust whose particle size is less than 0.25μm and can be seen under the electron microscope. Common smog environment.

KN 100 .

Remarks: 1 mm = 1000 μ m 1 μ m = 1000 nm, welding smoke is about 150 nm, and smoke is 2.5 μ m.

1 mesh =25.4 mm particle size 220,000 mesh ≈75 nm particle size

Bidding requirements for non-oily particle masks

project

serial number

Bidding demand

correlation index

cause

☆

Los Angeles certificate

copy

Basic project

☆

test

report

copy

Essential parts. This national standard is mandatory (photo inspection report must be attached).

1

carry out

standard

GB2626-2006

1. At present, the standard name of dust mask in China is: GB2626-2006 "Respiratory protective articles-particulate-proof self-priming filter respirator".

2、

2

protect

grade

KN 100 :≥99.97%

KN95:>95%

KN90:>90%

The above results are aimed at the protective effect of the test results on the particle size of 75 nm under the national standard conditions.

Protective effect on dust, smoke, fog and microorganisms at an air flow rate of 85L per minute.

The allowable limit of general environmental particulate matter is between 1.5-4 mg. 1 g = 1000 mg. Coal mine is generally 500-2000 mg /m? .

1, high concentration dust, toxic particles, welding fume environment, it is recommended to use KN 100 grade.

2. For moderate dust concentration, large particles and smog, it is recommended to use KN95 or above.

3, sawdust, feed, flour and other environments, it is recommended to use KN90 or above.

three

Disposable or semi-mask

1. Disposable mask: not suitable for occupational protection.

2. Composite half mask: suitable for occupational protection.

1. Disposable masks are also called disposable masks. When testing, only the protective effect of cotton filter was tested, and the particles of 0.02-2 microns were used for inspection, and the mass median diameter was 0.6 microns. The maximum allowable leakage rate is 13%. Not suitable for high dust environment and occupational protection.

2. Composite semi-mask, whose service life exceeds the service life of the filter element. Generally, the filter element can be replaced within the service life of the mask. During the test, the comprehensive protective effect of the mask and filter cotton was tested, and the particles of 0.075 micron were used for inspection. The maximum allowable leakage rate is 2%. Suitable for high dust environment and occupational protection.

four

Mask materials and service life

1, made of rubber. 2, silicone material.

For the wearer:

1, rubber material has relatively high hardness and short service life, which is easy to cause facial indentation. Low price. Short-term economy.

2. The silicone mask has low hardness, low pressure on the face, and is not easy to cause facial indentation. Price is high. Long-term use economy.

3. Whether the mask design conforms to ergonomics is related to the close cooperation with the face.

4. Generally, the service life of rubber masks is 1-3 months, and that of silicone masks is 12 months or more.

5. For people with large turnover, rubber material is recommended, which is relatively economical. The staff is stable, and the silicone mask is recommended, which is more economical.

five

Service life of filter element

Service life of filter element

The common low-grade cotton filter element in the market has a service life of 1 day, low price, low protection efficiency and high daily cost.

The service life of some high-grade KN 100 filter cotton is more than 1 month, with high unit price, good protective effect and low daily cost.

six

mask

shape

Masks are divided into three sizes: large, medium and small.

It is recommended to buy masks of different sizes according to the situation.

According to national standards, masks are divided into three sizes: large, medium and small.

1, the large size is rarely used, and it is not produced in China at present. Medium size is suitable for people over 170CM and weighing over 63KG. Smaller than this standard and suggested by the lady.

2. Generally speaking, boys over 10 and girls over10/0 have the same head size as adults.

3. Many masks in China have different sizes, which leads to great differences in the use effect.

seven

breathe

obstacle

National standards require inspiratory resistance to be lower than 350 Pa and expiratory resistance to be lower than 250 Pa. It is recommended to choose low resistance products.

1. At present, the expiratory resistance in China is generally 40- 150 Pa.

2. Due to the different scientific and technological levels of manufacturers, the inspiratory resistance varies greatly. Usually 80-300 Pa.

3, low respiratory resistance, oxygen supply can improve work efficiency when heavy physical exertion.

4. Generally, the protection efficiency is low and the inspiratory resistance is low. Some domestic manufacturers can achieve 120 Pa at KN 100 level and 90 Pa at KN95 level.

Bidding demand of dust mask in a machinery factory

Require bidders to provide

1, product LA certification.

2. Product inspection report of 2.GB2626-2006 "Breathing Protective Equipment Self-priming Filter Anti-particulate Respirator".

3. Mask type: double half mask.

4. Mask material: silicone/rubber.

5. Mask size: semicolon type, M/S number.

6. Protection grade: GB2626-2006 KN 100.

7. inspiratory resistance: < < 150PA.

8. Sample trial: The service life of the filter cotton is longer than XX hours under XX working conditions (optional).