Notes:

1. By agreement with the consumer, the mass fraction of water in coal, except for premium grade A coal, is allowed up to 20%, recalculating the actual mass to 6% moisture content.

2. Only grade A charcoal is intended for the production of active carbons, and grades A and B are intended for the production of carbon disulfide.

3. The standards according to clause 5 (for coal with grains less than 25 mm in size) and clause 7 of the table are established for coal intended for the production of active carbons.

4. During transportation, it is allowed to increase the mass fraction of coal of standardized fractions (less than 12 or 25 mm in size) by no more than 0.8% for every 100 km of track.

(Changed edition, Amendment No. 1).

2. SAFETY REQUIREMENTS

2.1. Charcoal is a flammable, porous solid. The minimum auto-ignition temperature is 340 °C. The lower concentration limit of ignition of charcoal dust is 128 g/m.

Freshly prepared coal in volumes of more than 100 dm3 is prone to spontaneous combustion under normal conditions.

2.2. Before shipment to the consumer, charcoal must be stabilized to prevent spontaneous combustion.

2.3. Charcoal must be protected from contact with strong oxidizing agents. Accumulation of coal dust is not allowed.

2.4. If charcoal catches fire, it should be extinguished with water or foam.

2.5. Charcoal belongs to the 4th hazard class - a low-hazard substance. The maximum permissible concentration of charcoal aerosol in the air of the working area is 6 mg/m (GOST 12.1.005).

2.6. When working with charcoal, safety rules for wood chemical industry enterprises must be observed.

3. ACCEPTANCE RULES

3.1. Rules for acceptance of charcoal - according to GOST 5445 with the following clarifications.

From coal transported in bulk, spot samples are taken at the beginning, middle and end of loading or unloading in equal portions.

From a coal stack, point samples are taken with a scoop at the middle of the stack height from a depth of 0.5 m from the surface.

The sampling volume of coal packed in bags is 10% of the batch.

4. METHODS OF ANALYSIS

4.1. Sampling methods are in accordance with GOST 5445. The mass of the combined sample must be at least 100 kg. The combined sample is poured onto a cutting platform, mixed carefully, then scattered in an even layer in the shape of a square and divided into four equal parts. An average sample weighing about 3 kg is taken from one part using the quartering method.

The remaining three parts are immediately used to determine the mass fraction of coal grains less than 12 or 25 mm in size and smut.

4.2. The average sample is crushed to grains no larger than 40 mm in size and divided into two equal parts.

4.3. One part of the average sample is sifted through sieves with holes with a diameter of 40 and 20 mm and used to determine the apparent density. The weight of the sifted sample must be at least 0.8 kg.

4.4. The other part of the average sample is divided into two equal parts, one of which is brought to 100 g using the quartering method, thoroughly ground with a pestle in a mortar (GOST 9147), sifted on a N 05 mesh (GOST 3826) and used to determine the mass fraction of ash, non-volatile carbon and water.

The second part of the sample is crushed with a pestle in a mortar, sifted through sieves with cloths No. 36 and No. 20 and used to determine the mass of 1 dm of coal.

(Changed edition, Amendment No. 1).

4.5. Samples taken according to paragraphs 4.3 and 4.4 are placed in a dry, clean glass jar or bag made of waterproof polymer material such as polyethylene.

4.6a. It is allowed to use other measuring instruments with metrological characteristics, utensils and equipment with technical characteristics not worse, as well as reagents of quality not lower than those specified in this standard.

(Introduced additionally, Amendment No. 2).

4.6. Determination of apparent density

4.6.1. Appliances, dishes, materials

The device for determining apparent density (Fig. 1) consists of the following parts: a metal cylinder with upper and lower drain pipes, a metal cylinder with a lower drain pipe, and a mesh cylinder with a lid.

1 - metal cylinder; 2 - upper drain pipe; 3 - lower drain pipe; 4 - cylinder-mesh;

5 - lock; 6 - perforated cover; 7 - holes with a diameter of 12 mm and a distance between them of 17 mm

General purpose laboratory scales with a maximum weighing limit of 500 or 1000 g and an error of ±38 or ±75 mg, respectively.

Laboratory glass thermometer, providing temperature measurement from 0 to 50 °C, with a division value of 1 °C.

Hourglass at 1 and 10 minutes.

Measuring cylinder according to GOST 1770, capacity 1000 cm.

(Changed edition, Amendment No. 1).

4.6.2. Carrying out analysis

About 400 g of coal, prepared according to clause 4.3, is placed in the mesh cylinder of the device and the lid is locked.

Metal cylinders are filled with tap water at a temperature of (25±10) °C.

A mesh cylinder with coal is placed in a cylinder with a closed lower drain pipe for 10 minutes. Then the mesh cylinder is removed, hung on a tripod and held for about 1 minute until the water stops flowing. After this, the coal is poured onto pre-moistened and wrung out cotton cloth, folded in five to six layers. The coal is lightly rolled over the cloth, placed again in the mesh cylinder, the lid is locked and carefully immersed in a metal cylinder with an upper drain pipe installed on a horizontal surface, having previously placed a measuring cylinder under the upper pipe.

When water stops flowing from the upper pipe, measure the volume of water in the cylinder.

The volume of water displaced by the empty mesh cylinder is first determined. After each determination, the water in the cylinders should be replaced by draining it through the lower pipe.

4.6.3. Processing the results

The apparent density of coal () in g/cm is calculated using the formula

,

where is the mass of a sample of coal, g;

Volume of water displaced by a mesh cylinder with coal, cm;

Volume of water displaced by an empty mesh cylinder, cm;

Mass fraction of water in coal, determined according to GOST 16399, %.

The arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between which, at a confidence probability of =0.95, should not exceed 0.02 g/cm.

4.7. The mass fraction of ash is determined according to GOST 12596 with the following additions:

the ash residue is calcined for 3 hours;

the arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between them at a confidence probability of =0.95 should not exceed 0.2%.

4.6.3, 4.7 (Changed edition, Amendment No. 2).

4.8. The mass fraction of non-volatile carbon () in percent is calculated using the formula

where is the mass fraction of ash, determined according to clause 4.7, %;

Mass fraction of volatile substances, determined according to GOST 6382 and calculated using the formula

,

where is the mass of an empty crucible with a lid, g;

Mass of the crucible with a lid and a portion of coal before heating, g;

Mass of the crucible with lid and non-volatile residue after heating, g;

Mass fraction of water, determined according to GOST 16399, section 2, %.

(Changed edition, Amendment No. 1).

4.9. Determination of the mass fraction of coal with grains less than 12 or 25 mm in size

4.9.1. Devices

Rumble (Fig. 2)

1 - frame; 2 - mesh size 1200x1600 mm with holes 12x12 or 25x25 mm;

3 - gearbox; 4 - electric motor

General purpose laboratory scales with a maximum weighing limit of 50 kg and an error of ±3750 mg.

Hourglass at 2 min.

4.9.2. Carrying out analysis

About 35 kg of coal is weighed, placed in a screen and sifted for 2 minutes. The number of oscillations of the screen should be 88-100 per minute, the oscillation amplitude should be 150 mm.

After sieving, coal with grains less than 12 or 25 mm in size is weighed.

4.9.3. Processing the results

The mass fraction of coal with grains smaller than 12 or 25 mm () in percent is calculated using the formula

Mass of coal with grains less than 12 or 25 mm in size, kg.

The arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between them at a confidence probability of =0.95 should not exceed 1%.

(Changed edition, Amendment No. 2).

4.10. Determination of the mass fraction of smut

4.10.1. Carrying out analysis

From coal with grains larger than 12 or 25 mm, obtained according to clause 4.9.2, pieces of partially charred wood are selected and weighed.

(Changed edition, Amendment No. 1).

4.10.2. Processing the results

The mass fraction of smut () in percent is calculated using the formula

where is the mass of the coal sample before sifting, kg;

Weight of smut, kg.

The arithmetic mean of two parallel determinations is taken as the result of the analysis.

4.11. Determination of the mass of 1 dm of coal

4.11.1. Cutlery, dishes

Laboratory drying cabinet, providing a temperature of 105-110 °C. General purpose laboratory scales with a maximum weighing limit of 500 or 1000 g and an error of ±38 or ±75 mg, respectively.

Measuring cylinder type 1-100 or 3-100 according to GOST 1770.

Incandescent mirror lamp type IKZ 215-225-500.

4.11.2. Carrying out analysis

About 120 g of coal, prepared according to clause 4.4, is placed on a sheet of paper in a layer no more than 0.5 cm thick.

The coal is dried in an oven at a temperature of 105-110 ° C for 3 hours or under an incandescent lamp installed at a height of 25 cm from the surface of the coal for 30 minutes with periodic stirring.

Dried coal is poured into the cylinder with a spoon in 10 cm portions, accompanied by lightly tapping the bottom of the cylinder on a rubber flat surface as it rotates around its axis. In this case, the angle of inclination of the cylinder should be no more than 25° from the vertical.

Each added portion of coal is compacted until no change in its volume is observed.

The cylinder filled to the mark is weighed. The weighing result is recorded to the second decimal place.

4.11.3. Processing the results

The mass of 1 dm of coal () in grams is calculated using the formula

,

where is the mass of the empty cylinder, g;

Mass of the cylinder with coal, g.

The arithmetic mean of two parallel determinations is taken as the result of the analysis; the permissible differences between the most different results with a confidence probability = 0.95 should not exceed 7 g.

(Changed edition, Amendment No. 1).

5. PACKAGING, LABELING, TRANSPORTATION AND STORAGE

5.1a. Packaging, labeling, transportation and storage - in accordance with GOST 28670.

5.1. Charcoal is supplied packaged or in bulk.

Charcoal is packed in paper bags of the NM brand in accordance with GOST 2226.

The bags are sewn or tied. The weight of coal in the bag should be no more than 15 kg.

5.1a, 5.1. (Changed edition, Amendment No. 2).

5.2. Transport marking - according to GOST 14192.

In addition, a label with the following designations is attached to each bag:

name of the manufacturer and its trademark;

name of the product, its brand, grade;

batch number;

Net weight;

date of manufacture of the product;

designation of this standard;

warning sign for dangerous cargo in accordance with GOST 19433.

5.3. Charcoal belongs to the 4th hazard class according to GOST 19433 (subclass 4.2; drawing 4b, classification code 4212) and UN serial number 1361.

(Changed edition, Amendment No. 1, 2).

5.4. Charcoal in bags and in bulk is transported by rail in dry, clean, covered wagons by carload or by road in covered vehicles in accordance with the rules for the transportation of goods in force for this type of transport.

5.5. To produce active carbons and carbon disulfide, charcoal is transported in covered wagons in bulk.

By agreement between the manufacturer and the consumer, it is allowed to transport charcoal in bulk in specially equipped gondola cars.

5.6. Gondola cars and vehicles must be covered with fireproof or difficult-to-burn materials that protect coal from fire and precipitation.

5.7. Charcoal is stored in bunkers or closed warehouses, under a canopy or shelter that protects the product from precipitation.

6. MANUFACTURER WARRANTY

6.1. The manufacturer must ensure that the manufactured product meets the requirements of this standard, subject to the conditions of transportation and storage.

6.2. The guaranteed shelf life of charcoal is 12 months from the date of manufacture of the product.

The text of the document is verified according to:

official publication

M.: IPK Standards Publishing House, 1998

Charcoal, GOST 7657-84

Mining of oil and gas. GOST 7657-84 - Charcoal. Technical conditions. OKS: Extraction and refining of oil, gas and related industries, Fuel. GOST standards. Charcoal. Technical conditions. class=text>

GOST 7657-84

Charcoal. Specifications

GOST 7657-84
Group L42

STATE STANDARD OF THE USSR UNION

CHARCOAL
Specifications
Charcoal. Specifications

OKP 24 5571 0100

Date of introduction 1986-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Forestry Industry of the USSR
DEVELOPERS:

A.N. Trofimov, O.V. Skvortsova, R.A. Shilnikova

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 18, 1984 N 4509
Change No. 2 was adopted by the Interstate Council for Standardization, Metrology and Certification on April 15, 1994 (Report of the Technical Secretariat No. 2)
The following voted for adoption:

3. INSTEAD GOST 7657-74

4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

5. The validity period was lifted according to Protocol No. 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

6. REISSUE (September 1998) with Amendments No. 1, 2, approved in March 1990 and March 1996 (IUS 6-90, 6-96)

This standard applies to charcoal obtained by pyrolysis and charcoalization of wood in industrial-type devices.
Charcoal is used in the production of crystalline silicon, non-ferrous metals, active carbons, carbon disulfide, ferroalloys, carburizer and for other purposes.

1. BRANDS AND TECHNICAL REQUIREMENTS

1.1. Charcoal must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the prescribed manner.

1.2. Charcoal from wood species in accordance with GOST 24260 is produced in three grades:
A - coal obtained from the pyrolysis of wood from group 1 species;
B - coal obtained by pyrolysis of a mixture of wood from species of groups 1 and 2;
B - coal obtained by charring a mixture of wood from species of groups 1, 2 and 3.

1.3. In terms of physical and chemical indicators, charcoal must meet the requirements and standards specified in the table.

Notes:

1. By agreement with the consumer, the mass fraction of water in coal, except for premium grade A coal, is allowed up to 20%, recalculating the actual mass to 6% moisture content.

2. Only grade A charcoal is intended for the production of active carbons, and grades A and B are intended for the production of carbon disulfide.

3. The standards according to clause 5 (for coal with grains less than 25 mm in size) and clause 7 of the table are established for coal intended for the production of active carbons.

4. During transportation, it is allowed to increase the mass fraction of coal of standardized fractions (less than 12 or 25 mm in size) by no more than 0.8% for every 100 km of track.

(Changed edition, Amendment No. 1).

2. SAFETY REQUIREMENTS

2.1. Charcoal is a flammable, porous solid. The minimum auto-ignition temperature is 340 °C. The lower concentration limit of ignition of charcoal dust is 128 g/m.
Freshly prepared coal in volumes of more than 100 dm3 is prone to spontaneous combustion under normal conditions.

2.2. Before shipment to the consumer, charcoal must be stabilized to prevent spontaneous combustion.

2.3. Charcoal must be protected from contact with strong oxidizing agents. Accumulation of coal dust is not allowed.

2.4. If charcoal catches fire, it should be extinguished with water or foam.

2.5. Charcoal belongs to the 4th hazard class - a low-hazard substance. The maximum permissible concentration of charcoal aerosol in the air of the working area is 6 mg/m (GOST 12.1.005).

2.6. When working with charcoal, safety rules for wood chemical industry enterprises must be observed.

3. ACCEPTANCE RULES

3.1. Rules for acceptance of charcoal - according to GOST 5445 with the following clarifications.
From coal transported in bulk, spot samples are taken at the beginning, middle and end of loading or unloading in equal portions.
From a coal stack, point samples are taken with a scoop at the middle of the stack height from a depth of 0.5 m from the surface.
The sampling volume of coal packed in bags is 10% of the batch.

4. METHODS OF ANALYSIS

4.1. Sampling methods are in accordance with GOST 5445. The mass of the combined sample must be at least 100 kg. The combined sample is poured onto a cutting platform, mixed carefully, then scattered in an even layer in the shape of a square and divided into four equal parts. An average sample weighing about 3 kg is taken from one part using the quartering method.
The remaining three parts are immediately used to determine the mass fraction of coal grains less than 12 or 25 mm in size and smut.

4.2. The average sample is crushed to grains no larger than 40 mm in size and divided into two equal parts.

4.3. One part of the average sample is sifted through sieves with holes with a diameter of 40 and 20 mm and used to determine the apparent density. The weight of the sifted sample must be at least 0.8 kg.

4.4. The other part of the average sample is divided into two equal parts, one of which is brought to 100 g using the quartering method, thoroughly ground with a pestle in a mortar (GOST 9147), sifted on a N 05 mesh (GOST 3826) and used to determine the mass fraction of ash, non-volatile carbon and water.
The second part of the sample is crushed with a pestle in a mortar, sifted through sieves with cloths No. 36 and No. 20 and used to determine the mass of 1 dm of coal.
(Changed edition, Amendment No. 1).

4.5. Samples taken according to paragraphs 4.3 and 4.4 are placed in a dry, clean glass jar or bag made of waterproof polymer material such as polyethylene.

4.6a. It is allowed to use other measuring instruments with metrological characteristics, utensils and equipment with technical characteristics not worse, as well as reagents of quality not lower than those specified in this standard.
(Introduced additionally, Amendment No. 2).

4.6. Determination of apparent density

4.6.1. Appliances, dishes, materials
The device for determining apparent density (Fig. 1) consists of the following parts: a metal cylinder with upper and lower drain pipes, a metal cylinder with a lower drain pipe, and a mesh cylinder with a lid.

Damn.1. Apparatus for determining apparent density

1 - metal cylinder; 2 - upper drain pipe; 3 - lower drain pipe; 4 - cylinder-mesh;
5 - lock; 6 - perforated cover; 7 - holes with a diameter of 12 mm and a distance between them of 17 mm
Damn.1

General purpose laboratory scales with a maximum weighing limit of 500 or 1000 g and an error of ±38 or ±75 mg, respectively.
Laboratory glass thermometer, providing temperature measurement from 0 to 50 °C, with a division value of 1 °C.
Hourglass at 1 and 10 minutes.
Measuring cylinder according to GOST 1770, capacity 1000 cm.
(Changed edition, Amendment No. 1).

4.6.2. Carrying out analysis
About 400 g of coal, prepared according to clause 4.3, is placed in the mesh cylinder of the device and the lid is locked.
Metal cylinders are filled with tap water at a temperature of (25±10) °C.
A mesh cylinder with coal is placed in a cylinder with a closed lower drain pipe for 10 minutes. Then the mesh cylinder is removed, hung on a tripod and held for about 1 minute until the water stops flowing. After this, the coal is poured onto pre-moistened and wrung out cotton cloth, folded in five to six layers. The coal is lightly rolled over the cloth, placed again in the mesh cylinder, the lid is locked and carefully immersed in a metal cylinder with an upper drain pipe installed on a horizontal surface, having previously placed a measuring cylinder under the upper pipe.
When water stops flowing from the upper pipe, measure the volume of water in the cylinder.
The volume of water displaced by the empty mesh cylinder is first determined. After each determination, the water in the cylinders should be replaced by draining it through the lower pipe.

4.6.3. Processing the results

The apparent density of coal () in g/cm is calculated using the formula

where is the mass of a sample of coal, g;
- volume of water displaced by the mesh cylinder with coal, cm;
- volume of water displaced by an empty mesh cylinder, cm;
- mass fraction of water in coal, determined according to GOST 16399, %.
The arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between which, at a confidence probability of =0.95, should not exceed 0.02 g/cm

4.7. The mass fraction of ash is determined according to GOST 12596 with the following additions:
the ash residue is calcined for 3 hours;
the arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between them at a confidence probability of =0.95 should not exceed 0.2%.

4.6.3, 4.7 (Changed edition, Amendment No. 2).

4.8. The mass fraction of non-volatile carbon () in percent is calculated using the formula

where is the mass fraction of ash, determined according to clause 4.7, %;
- mass fraction of volatile substances, determined according to GOST 6382 and calculated by the formula

where is the mass of an empty crucible with a lid, g;
- mass of the crucible with a lid and a sample of coal before heating, g;
- mass of the crucible with a lid and non-volatile residue after heating, g;
- mass fraction of water, determined according to GOST 16399, section 2, %.
(Changed edition, Amendment No. 1).

4.9. Determination of the mass fraction of coal with grains less than 12 or 25 mm in size

4.9.1. Devices
Rumble (Fig. 2)

Damn.2. Bolt

1 - frame; 2 - mesh size 1200x1600 mm with holes 12x12 or 25x25 mm;
3 - gearbox; 4 - electric motor
Damn.2

General purpose laboratory scales with a maximum weighing limit of 50 kg and an error of ±3750 mg.
Hourglass at 2 min.

4.9.2. Carrying out analysis
About 35 kg of coal is weighed, placed in a screen and sifted for 2 minutes. The number of oscillations of the screen should be 88-100 per minute, the oscillation amplitude should be 150 mm.
After sieving, coal with grains less than 12 or 25 mm in size is weighed.

4.9.3. Processing the results
The mass fraction of coal with grains smaller than 12 or 25 mm () in percent is calculated using the formula

- mass of coal with grains less than 12 or 25 mm in size, kg.
The arithmetic mean of two parallel determinations is taken as the result of the analysis, the absolute permissible differences between them at a confidence probability of =0.95 should not exceed 1%.
(Changed edition, Amendment No. 2).

4.10. Determination of the mass fraction of smut

4.10.1. Carrying out analysis
From coal with grains larger than 12 or 25 mm, obtained according to clause 4.9.2, pieces of partially charred wood are selected and weighed.
(Changed edition, Amendment No. 1).

4.10.2. Processing the results
The mass fraction of smut () in percent is calculated using the formula

where is the mass of the coal sample before sifting, kg;
- weight of smut, kg.
The arithmetic mean of two parallel determinations is taken as the result of the analysis.

4.11. Determination of the mass of 1 dm of coal

4.11.1. Cutlery, dishes
Laboratory drying cabinet, providing a temperature of 105-110 °C. General purpose laboratory scales with a maximum weighing limit of 500 or 1000 g and an error of ±38 or ±75 mg, respectively.
Measuring cylinder type 1-100 or 3-100 according to GOST 1770.
Incandescent mirror lamp type IKZ 215-225-500.

4.11.2. Carrying out analysis
About 120 g of coal, prepared according to clause 4.4, is placed on a sheet of paper in a layer no more than 0.5 cm thick.
The coal is dried in an oven at a temperature of 105-110 ° C for 3 hours or under an incandescent lamp installed at a height of 25 cm from the surface of the coal for 30 minutes with periodic stirring.
Dried coal is poured into the cylinder with a spoon in 10 cm portions, accompanied by lightly tapping the bottom of the cylinder on a rubber flat surface as it rotates around its axis. In this case, the angle of inclination of the cylinder should be no more than 25° from the vertical.
Each added portion of coal is compacted until no change in its volume is observed.
The cylinder filled to the mark is weighed. The weighing result is recorded to the second decimal place.

4.11.3. Processing the results
The mass of 1 dm of coal () in grams is calculated using the formula

where is the mass of the empty cylinder, g;
- mass of the cylinder with coal, g.
The arithmetic mean of two parallel determinations is taken as the result of the analysis; the permissible differences between the most different results with a confidence probability = 0.95 should not exceed 7 g.
(Changed edition, Amendment No. 1).

5. PACKAGING, LABELING, TRANSPORTATION AND STORAGE

5.1a. Packaging, labeling, transportation and storage - in accordance with GOST 28670.

5.1. Charcoal is supplied packaged or in bulk.
Charcoal is packed in paper bags of the NM brand in accordance with GOST 2226.
The bags are sewn or tied. The weight of coal in the bag should be no more than 15 kg.

5.1a, 5.1. (Changed edition, Amendment No. 2).

5.2. Transport marking - according to GOST 14192.
In addition, a label with the following designations is attached to each bag:
name of the manufacturer and its trademark;
name of the product, its brand, grade;
batch number;
Net weight;
date of manufacture of the product;
designation of this standard;
warning sign for dangerous cargo in accordance with GOST 19433.

5.3. Charcoal belongs to the 4th hazard class according to GOST 19433 (subclass 4.2; drawing 4b, classification code 4212) and UN serial number 1361.
(Changed edition, Amendment No. 1, 2).

5.4. Charcoal in bags and in bulk is transported by rail in dry, clean, covered wagons by carload or by road in covered vehicles in accordance with the rules for the transportation of goods in force for this type of transport.

5.5. To produce active carbons and carbon disulfide, charcoal is transported in covered wagons in bulk.
By agreement between the manufacturer and the consumer, it is allowed to transport charcoal in bulk in specially equipped gondola cars.

5.6. Gondola cars and vehicles must be covered with fireproof or difficult-to-burn materials that protect coal from fire and precipitation.

5.7. Charcoal is stored in bunkers or closed warehouses, under a canopy or shelter that protects the product from precipitation.

6. MANUFACTURER WARRANTY

6.1. The manufacturer must ensure that the manufactured product meets the requirements of this standard, subject to the conditions of transportation and storage.

6.2. The guaranteed shelf life of charcoal is 12 months from the date of manufacture of the product.