Drying oil Yaroslavl paints shelf life. Drying oil oksol

1. STAMPS

2. TECHNICAL REQUIREMENTS

7. MANUFACTURER WARRANTY

APPENDIX

PURPOSE, PRECAUTIONS, METHOD OF APPLICATION OF OLIF OXOL INTENDED FOR RETAIL TRADE

INFORMATION DATA

1. STAMPS

2. TECHNICAL REQUIREMENTS

3. SAFETY REQUIREMENTS

6. PACKAGING, LABELING, TRANSPORT AND STORAGE

7. MANUFACTURER WARRANTY

APPENDIX (mandatory). PURPOSE, PRECAUTIONS, METHOD OF APPLICATION OF OLIF OXOL INTENDED FOR RETAIL TRADE

Purpose and principle of operation of drying oil

Types of drying oils and their features

Specifications - we study GOST

The wisdom of coloring products with Oksol

How to paint products with drying oil Oksol - a step by step diagram

Step 1: Preparatory Stage

Compound:

Transportation and storage:

16.06.2019

GOST 1571-82

GOST 3134-78

GOST 5472-50

GOST 5476-80 *

______________
* GOST 5476-80 has been canceled on the territory of the Russian Federation since 06/01/2004. GOST R 52110-2003 is valid. - Note "CODE".

GOST 5481-89

GOST 5789-78

GOST 5791-81

GOST 5955-75

GOST 7824-80

GOST 7825-96

GOST 8420-74

GOST 8808-91

GOST 8989-73

GOST 9980.1-86

GOST 9980.2-86

GOST 9980.3-86

GOST 9980.4-86

GOST 9980.5-86

GOST 10113-62

GOST 14192-96

GOST 17537-72

GOST 19007-73

GOST 19266-79

GOST 19433-88

GOST 25336-82

5. The limitation of the validity period was removed according to protocol N 5-94 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-12-94)

6. EDITION (August 2001) with Amendments No. 1, 2, approved in November 1984, June 1990 (IUS 2-85, 9-90)

This standard applies to drying oil oxol, which is a solution of oxidized vegetable oil and desiccants in white spirit, nefras, turpentine.

1.1. Depending on the raw materials used, drying oil oxol is produced in the following grades:


Drying oil brand oksol

B - made from linseed and hemp oil. Intended for manufacturing oil paints ready-to-use, and for diluting thick paints used for exterior and interior painting works except for floor painting.

HP - is made from sunflower or soybean, or safflower, or corn, or grape, or camelina oil, or mixtures thereof, with the possible partial replacement of these oils with oil substitutes - light petroleum polymer resins (not more than 40%).

Drying oil is intended for the manufacture of ready-to-use oil paints, and for diluting thickly grated paints used for painting indoors, with the exception of painting floors.

2.1. Drying oil oksol must be produced in accordance with the requirements of this standard for recipes and technological regulations.

2.2. For the production of drying oil oxol, the following types of raw materials are used:

for drying oil oksol grade B:

technical linseed oil according to GOST 5791;

hemp oil according to GOST 8989 for technical purposes;

for drying oil Oksol brand PV:

camelina oil (technical) according to GOST 10113;

technical grape oil;

vegetable oils not suitable for direct consumption or for industrial processing food products according to sanitary indicators or acid number;

sunflower oil in accordance with GOST 1129 and other regulatory and technical documentation (NTD) with an acid number of not more than 15 mg KOH / g;

soybean oil according to GOST 7825 and other NTD;

safflower oil;

unrefined corn oil according to GOST 8808.

The oils used in the production of drying oil oxol must contain phosphorus-containing substances, determined according to GOST 7824, not more than 0.026% in terms of PO or not more than 0.3% in terms of stearoleolecithin.

Application for the manufacture of drying oil oksol brand PV food vegetable oils suitable for food purposes is not allowed.

Driers:

naphthenate according to GOST 1003, fused oil, fatty acid, resinates (lead, manganese, cobalt, lead-manganese, lead-manganese-cobalt).

Solvents:

white spirit (nefras S-155/200) according to GOST 3134;

gum turpentine according to GOST 1571;

nefras S-150/200 according to NTD;

synthetic substitutes for vegetable oils:

light petroleum resins such as pyroplast, pyrolene according to the current NTD.

2.3. Drying oil oxol must comply with the standards specified in table.1.

Table 1


Name of indicator	Norm for stamps

1. Color according to the iodometric scale, mg J/100 cm, not darker
2. Relative viscosity according to the viscometer type VZ-246 (or VZ-4) with a nozzle diameter of 4 mm at a temperature of (20.0 ± 0.5) ° C, s
3. Acid number, mg KOH/g, no more
4. Mass fraction of non-volatile substances, %
5. Sediment by volume,%, no more
6. Transparency
7. Flash point in a closed crucible, °C, not below
8. Drying time up to degree 3, h, at a temperature of (20±2) °C, no more
Notes: 1. For drying oil oxol grade PV from camelina oil, a color of no more than 1800 is allowed, from soybean oil - no more than 1100. 2. For drying oil oksol brand B from hemp oil, a color of no more than 1100 is allowed. 3. When using sunflower oil with an acid number of 8 to 15 mg KOH/g, an acid number of no more than 10 mg KOH/g is allowed for drying oil oksol grade PV. 4. For drying oil grade PV from vegetable oil mixed with petroleum polymer resin, the mass fraction of the film-forming substance (57 ± 2)% is allowed with mandatory compliance with the requirements in terms of "viscosity".

2.2, 2.3. (Changed edition, Rev. N 1, 2).

3.1. Drying oil oxol is a toxic and flammable liquid, dangerous at elevated temperatures, due to the properties of its constituent solvents and oils.

Characteristics of the toxicity and fire hazard of the solvents that make up the drying oil oxol, are given in table.2.

table 2

Indicators of the fire and explosion hazard of drying oil oxol are given in table 3.

Table 3

(Changed edition, Rev. N 1, 2).

3.2. In the production, testing and use of oxol drying oil, fire safety requirements in accordance with GOST 12.1.004 and GOST 12.3.005 must be observed, the premises must be equipped with fire fighting equipment in accordance with GOST 12.4.009.

3.2.1. Work on opening a metal package should be carried out with tools that do not give a spark when struck.

3.2.2. In case of fire, all fire extinguishing agents are used (chemical foam, water vapor, finely sprayed water, inert gas, asbestos cloth).

3.3. In the premises for the storage and use of drying oil oksol, open fire is prohibited; artificial lighting and electrical equipment must be explosion-proof.

3.4. Personal protective equipment - according to GOST 12.4.011.

3.2-3.4. (Changed edition, Rev. N 1).

3.5. All work related to the manufacture, testing, use and storage of drying oil oksol should be carried out in rooms equipped with supply and exhaust ventilation or well ventilated.

(Introduced additionally, Rev. N 2).
(Changed edition, Rev. N 1, 2).

5.4. Determination of acid number - according to GOST 5476. For dissolution, a mixture of one part of ethyl alcohol and two parts of ethyl ether or a mixture of equal volumes of ethyl alcohol and benzene according to GOST 5955, or a mixture of equal volumes of ethyl alcohol or toluene according to GOST 5789 is used.

5.5. Determination of the mass fraction of non-volatile substances - according to GOST 17537, section 1.

At the same time, 1.5-2.0 g of drying oil is placed in a cup, weighed and the result is recorded to the second decimal place. The contents of the cup are distributed by rotation in a thin layer along the bottom of the cup. Then the cup is placed in an oven and dried for 15 minutes at a temperature of (140 ± 2) °C, after which the cup is cooled in a desiccator, weighed and the result is recorded to the second decimal place. Subsequent weighings are carried out every 5 minutes of drying. The mass is considered constant if the difference between the results of subsequent weighings does not exceed 0.01 g.

Calculations are carried out to the first decimal place.

The permissible absolute discrepancy between the results of two parallel determinations should not exceed 1%.

(Changed edition, Rev. N 2).

5.6. Determination of sludge by volumetric method - according to GOST 5481 without heating.

5.7. Determination of transparency - according to GOST 5472, while drying oil is poured into a cylinder with a capacity of 10 cm3 or into a test tube made of colorless glass according to GOST 25336.

(Changed edition, Rev. N 1).

5.8. Determination of the flash point in a closed crucible - according to GOST 12.1.044.

(Changed edition, Rev. N 2).

5.9. The determination of the drying time is according to GOST 19007 to degree 3. In this case, a glass rod with a diameter of 4 mm is immersed in drying oil to a depth of 3 cm and 4-5 drops of drying oil are applied to a glass plate measuring 9x12 cm. Then the drying oil is evenly distributed over the entire surface of the plate manually.

Brush application is allowed. In this case, drying oil is applied at the rate of (1.0 ± 0.2) mg per 1 cm of the plate surface. The test is carried out under natural drying conditions. Film thickness is not defined.

It is allowed to blow off or move it with a soft brush while holding the paper on the surface (for example, due to static electricity).

(Changed edition, Rev. N 2).

6.1. Packing - in accordance with GOST 9980.3, 16th group.

6.2. Container marking - in accordance with GOST 9980.4 without indicating the color, indicating the classification code "Olifa Oksol, 3313" and the danger sign (class 3) in accordance with GOST 19433.

6.3. Labeling of consumer packaging intended for retail, - according to GOST 9980.4 without specifying the color, with the inscription "Keep away from fire". Purpose, method of application, precautions for handling drying oil Oksol for retail are indicated in the Appendix.

6.1-6.3. (Changed edition, Rev. N 1, 2).

6.4. Transport marking - in accordance with GOST 14192 with indication of the handling sign "Keep away from heat".

(Changed edition, Rev. N 1).

7.1. The manufacturer guarantees the compliance of drying oil oksol with the requirements of this standard, subject to the conditions of transportation and storage.

7.2. Warranty shelf life of drying oil - 12 months from the date of manufacture.

7.1, 7.2. (Changed edition, Rev. N 1).

APPENDIX
Mandatory

Drying oil oksol is intended for dilution of thickly grated oil paints, for impregnation (polishing) wooden surfaces, plasters before painting them with oil paints.

Drying oil oksol grade B and paints prepared with its use are intended for exterior and interior finishing works(except for painting floors).

Drying oil oksol grade PV and paints prepared with its use - for indoor work (except for painting floors).

Drying oil oksol is applied with a brush on a clean, dry surface. Drying of each layer at a temperature of (20 ± 2) ° C - 24 hours.

Drying oil should be stored in a tightly closed container. The room where the painting is carried out must be ventilated.

It is not allowed to leave rags, rags soaked with drying oil in the room.

(Introduced additionally, Rev. N 1).

The text of the document is verified by:
official publication
M.: IPK Standards Publishing House, 2001

GOST 190-78

INTERSTATE STANDARD

OLIFA

oxol

TECHNICAL CONDITIONS

Moscow

INTERSTATE STANDARD

Introduction date 01.01.80

This standard applies to drying oil oxol, which is a solution of oxidized vegetable oil and desiccants in white spirit, nefras, turpentine.

(Revised edition, Rev. No. 2).

1.1. Depending on the raw materials used, drying oil oxol is produced in the following grades:

B - made from linseed and hemp oil. It is intended for the manufacture of ready-to-use oil paints and for diluting thickly grated paints used for exterior and interior painting work, with the exception of floor painting.

HP - is made from sunflower or soybean, or safflower, or corn, or grape, or camelina oil, or mixtures thereof, with the possible partial replacement of these oils with oil substitutes - light petroleum polymer resins (not more than 40%).

Drying oil is intended for the manufacture of ready-to-use oil paints, and for diluting thickly grated paints used for painting indoors, with the exception of painting floors.

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

2.1. Drying oil oksol must be produced in accordance with the requirements of this standard for recipes and technological regulations.

(Revised edition, Rev. No. 1).

It is allowed to store drying oil oxol in steel tanks according to, subgroup 6, located in open areas, in conditions that exclude the ingress of precipitation and dust into them.

6.5, 6.6. (Changed edition, Rev. No. 1, 2).

6.7, 6.8. (Excluded, Rev. No. 1).

7.1. The manufacturer guarantees the compliance of drying oil oksol with the requirements of this standard, subject to the conditions of transportation and storage.

7.2. Warranty shelf life of drying oil - 12 months from the date of manufacture.

7.1, 7.2. (Revised edition, Rev. No. 1).

Mandatory

Drying oil oksol is intended for dilution of thick oil paints, for impregnation (polishing) of wooden surfaces, plasters before painting them with oil paints.

Drying oil oksol grade B and paints prepared with its use are intended for exterior and interior finishing works (except for painting floors).

Drying oil oksol grade PV and paints prepared with its use - for indoor work (except for painting floors).

Drying oil oksol is applied with a brush on a clean, dry surface. Drying of each layer at a temperature of (20 ± 2) °C - 24 hours.

Drying oil should be stored in a tightly closed container. The room where the painting is carried out must be ventilated.

It is not allowed to leave rags, rags soaked with drying oil in the room.

(Introduced additionally, Amendment No. 1).

1. DEVELOPED AND INTRODUCED by the Ministry Food Industry USSR

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 14.08.78 No. 2199

3. REPLACE GOST 190-68

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

Item number

Drying oils are processed products of vegetable oils, fats and organic matter. They are used for the production and dilution of paints and priming of the surface to be painted. The best drying oils are natural, phthalic and pentaphthalic. Drying oils different types can be combined, but the quality of the mixed drying oil will be the same as that of the worst drying oil.! Virtually all drying oils (except natural) are flammable and explosive materials, as they contain flammable solvents.

Natural oils.

In fact, drying oil is called a substance obtained from different types of vegetable oils - linseed, tung, sunflower, etc. Two types of drying oil are made on vegetable oils (without the addition of synthetic film formers): natural and oxol.
Drying oil natural. It is obtained from linseed or hemp oils by heating drying oils with metal oxides (desiccants) or by oxidation, in other words, by blowing air through the oil. Cobalt, manganese or lead salts of acids are used as driers. Natural drying oils are a high-quality film-forming material that gives weather-resistant coatings. Used for the production of oil paints for any purpose.
Warranty period of storage - 24 months.
Drying oil oksol. It is a solution of oxidized condensed vegetable oil and desiccant in solvent gasoline (white spirit). Depending on the raw materials used, drying oil oxol is made of the following grades:
B - from linseed or hemp oils. Intended for the manufacture of oil paints used for exterior and internal works, except for the color of the floor;
PV - from sunflower, soybean, safflower, corn, grape or camelina oils. Intended for the manufacture of oil paints used for interior work, in addition to coloring the floor, also for primers and fillers.

Unlike natural drying oil, the coating prepared on drying oil oxol dries faster, but it turns out to be more fragile and less durable. In practice, drying oils oxol can really be distinguished from natural drying oils strong solvent odor. The approximate composition of drying oil oxol: oil - 50%, desiccant - 3%, white spirit - 47%.
Warranty period of storage - 12 months.

Synthetic oils.

synthetic substances, appearance similar to drying oil and created for the same purposes are usually called drying oils, although they are made from petroleum, shale oils, resins with solvents, synthetic rubber production waste. Their characteristics are worse than those of “natural” drying oils: they are darker, they dry more slowly, they are distinguished by low water resistance and a weak film (except for pentaphthalic and phthalic drying oils).
Drying oil polydiene. It consists of polydiene, rosin glycerol ester, lead-manganese fused desiccant and thinner gasoline. There may be the addition of substandard oxidized vegetable oil.
Drying oil oligodivinylstyrene. The product obtained as a result of co-oligomerization of styrenes, dissolved in gasoline, solvent or xylene.
Synthetic varnishes are intended mainly for diluting dark paints, making putties and priming iron, wood or plastered surfaces inside the room.

Among the synthetic drying oils, the exceptions are phthalic and pentaphthalic drying oils, which are obtained as products of joint processing of the corresponding resins and natural drying oils. They are 50% mixtures of medium-fat phthalic resin or fatty pentaphthalic resin in white spirit with the addition of a desiccant. Coatings formed by paints prepared on these drying oils are superior in strength to coatings prepared on natural drying oils.

Combined drying oils

Combined drying oils are a mixture of vegetable oils with synthetic drying oils. Designed for the production of ready-to-use and thick oil paints, also for priming various materials.
Depending on the initial raw materials, combined drying oils are made of the following grades:
K-2 from the consistency of semi-drying and drying oils;
K-3 from drying oils;
K-4 from semi-drying oils;
K-5 from the consistency of semi-drying or drying oils with tung or oytisic;
K-12 from maleized semi-drying oils.
Drying oils K-2, K-4 and K-12, as well as paints prepared on their basis, can only be used for interior work, drying oils K-3 and K-5 and paints based on them - both inside and outside .

Composite drying oils

Composite drying oils are a solution of oxidized vegetable oil in gasoline, to which rosin varnish KF-287 is added. In the manufacture of drying oil, it is allowed to replace sunflower oil (less than 5%) with mustard, castor, stone, corn, rapeseed, camelina, cottonseed oils.
Drying oil oil-rubber. Solution of synthetic rubbers modified with vegetable or tall oils. Depending on the raw material, drying oil is produced in 2 grades:
MK-1 - designed for oil-rubber paints, which can be used to paint different surfaces both inside and outside, also for priming.
MK-2 - for interior work and for priming.
Solvents for these drying oils and paints based on them are gasoline, turpentine, solvent.

The choice of drying oil

In order to independently, at home, evaluate the quality of the existing drying oil, it is applied in an even and thin layer on a small piece of glass. Glass is placed obliquely, at an angle of about 45 degrees. Drying oil flows down the glass, leaving a thin trace on it. If she good quality, then after 12 hours it will dry so much that from a light touch of a finger on the film there will be no trace. A day later, the finger, even with strong pressure, in any case, should not stick to the film.

The quality of drying oil is also judged by the type of film formed on the glass, which is transparent and uniform in high-quality drying oil.

In addition, the film from a good drying oil is cut off with the tip of a sharp knife, forming thin elastic chips. If the drying oil is diluted with some volatile solvent, then the film is scraped off badly.

If the film is rubbed into powder when rubbed with a finger or cracked during drying, then you have at your disposal a surrogate, for example, say, rosin varnish. In the case when the film after a long drying still remains "greasy" - there is too much mineral oil in the drying oil, and it is completely unsuitable for painting work.

Traditional paint material for impregnation of wood and dilution of oil paints. Made from vegetable oil.

Advantages
- Good penetrating and pore-filling ability.
- Allows to reduce a consumption of finishing material.
- Good moisture resistance.
- Good adhesion to the painted surface.
Purpose
. for impregnation of wooden surfaces (with the exception of floors) before painting with oil paints;
. for thinning oil paints ready for use;
. for dilution of the thickly ground paints applied to painting works indoors.

oils, desiccants, modifiers, solvents.

Drying oil should be transported and stored in a tightly closed container, away from heating devices, protected from moisture and direct sunlight.

To clear a surface of dirt and dust, if necessary to sand, dry. Stir the oil thoroughly before use. Apply without dilution. Apply with a brush in 2-3 layers on a clean, dry surface. Coloring with oil paint should be carried out only after the drying oil has completely dried!

The drying time of each layer of drying oil at a temperature of (20 ± 2) ° C is 24 hours.
The consumption of drying oil for a single-layer coating (depending on the absorbency of the surface) is 1 kg per 6-10 m².

Wood is very often used in construction and everyday life, but Oksol drying oil will help protect it from the destructive effects of insects and time. Let's get acquainted with the features of this composition, its characteristics and, of course, dwell on the practical part.

The principle of operation is that most oils, upon contact with oxygen, heat and light, thicken very intensively, and a thin layer completely hardens. This is due to fatty acid glycerides, because their amount and the degree of iodine number (an indicator of the number of double bonds in the carbon chain) are directly proportional to the rate of setting of the agent. Linen and hemp compositions of drying oil Oksol (GOST 190–78) are most effective, since the oils of these plants have 80% and 70% of glycerides of linoleic and linolenic acids, respectively, and the iodine number exceeds 150.

It should be noted that in his natural form any vegetable oil freezes for quite a long time, and in order to accelerate this property, it is subjected to heat treatment. When heated, the hardening-retarding substances decompose, and salts provoke rapid oxidation. In addition, special compounds are introduced that contribute to its rapid drying (driers). As a result, the film deposited on the surface becomes solid within 6 to 36 hours.

There are several varieties. Natural 97% consist of plant oils (sunflower or flax), the rest is occupied by a desiccant. Their main purpose is to dilute paints and treat wooden surfaces in rooms. Such drying oils are divided into oxidized and polymerized. The latter have a darker color, and products treated with it age faster.

Characteristics of drying oil Oksol (GOST 190–78) practically do not differ from natural. It is applied to internal and external works. But the composition also includes a solvent, which gives a pungent odor. Also, this type is cheaper than the previous one. Drying oil Oksol is produced in two grades - "V" and "PV". The first are created on the basis of flax or hemp oils. To create the second, petroleum polymer resins and other technical oils are used. Therefore, when working with drying oil, especially the PV brand, you should be extremely careful, wear respirators and protective gloves.

Often Oksol is marked "combined", "composite" or "semi-natural", which once again proves its origin. But sometimes it makes a fundamental difference for those who care about composition. Combined Oksol received rapeseed oil as a natural component, while sunflower oil was mainly used for production. But the situation was complicated by the fact that the new component belongs to the class of non-drying ones. Then it was pre-oxidized, and as a result, the combined Oxol received the same characteristics as the original version of the composition.

In the broad sense of the word, combined drying oil is obtained by mixing oils of several plants or those that have undergone different processing, the addition of synthetic substances and a solvent is also allowed.. The use of this option is more common in the preparation of paints. Drying oil of several brands is produced. In the designation, the first is the letter "K", followed by a number. If an even number is indicated in the marking, then the mixture is used for interior work, and an odd number is used for painting outdoor objects.

The last type is synthetic compounds. The basis for paints is alkyd drying oil, its cost is much lower than oil, which is a definite plus. Another type is compositional compositions. Their quality is not high enough, and due to increased toxicity, use is limited only to outdoor work. When choosing synthetic drying oils, one should be extremely careful, since if at least a small deposit of natural oils is present in them, then the layer after painting may not dry out for a very long time. The presence of such inclusions can be determined visually. This mixture has a reddish tint and a black precipitate.

Drying oil Oksol (GOST 190–78) is characterized by the following properties. Due to the solvent, it has a pungent odor that does not disappear immediately. The time of complete drying is no more than a day. In addition, drying oil Oksol is highly flammable and toxic, therefore, when working with it, all safety rules should be followed.

According to GOST 190–78, marking is carried out depending on the composition, for example, drying oil “B”, which has excellent properties, is made only from hemp and linseed oil. It can be used both for dilution and for the manufacture of oil paints. It is also acceptable to carry out external and internal painting work. Drying oil "PV", created on the basis of other technical vegetable oils (sunflower, grape, soybean, corn, etc.), has a similar purpose, but its use is limited only to indoor work.

Both types of Oksoli cannot be used for painting floors.

The technical characteristics of drying oil Oksol are indicated in GOST 190–78, but nevertheless we will dwell on them in more detail. The acid number for type "B" is no more than 6 mg KOH/g, and for "PV" - 8 mg KOH/g. The exception is drying oil based on sunflower oil, in which case this figure can reach 10. It is unacceptable for the sediment to exceed 1%, transparency must be complete. The mass fraction of non-volatile substances ranges from 54.5 to 55.5%, regardless of the brand. The flash point in a closed crucible is above 32 °C.

Drying oil Oksol is stored mainly in metal containers, but it is strictly forbidden to open it with tools that give a spark. When transporting, it is necessary to use the transport marking, namely the “Keep away from heat” sign. In more detail, all the characteristics of the composition, as well as safety requirements, test methods and acceptance rules are described in GOST 190–78.

Now consider the features of the use of drying oil Oksol. In general, there is no great difficulty in this, but we want to highlight some of the nuances, so we will analyze the order of work.

Solvent name

Maximum allowable concentration in air working area industrial premises, mg/m

Temperature, °C

Concentration limits of ignition, %, by volume

Hazard Class

self-ignition
changes

White Spirit
(nefras S-155/200) (GOST 3134)

Nefras S-150/200

Turpentine
(GOST 1571)

Due to the pungent odor and toxic emissions, special attention should be paid to safety. All work is carried out in overalls, respiratory organs also need special protection, so you should prepare a respirator in advance, and rubber gloves are put on your hands. If the composition gets on the skin, then it is necessary to immediately wipe it off with a rag moistened with vegetable oil, and rinse the damaged area well. warm water with soap. Avoid getting drying oil in the organs of vision. In addition, open flames are prohibited in the premises where work is carried out. And all lighting sources and electrical equipment must be reliably protected from explosions. And make sure you have good ventilation.