Solvent P4: technical specifications, composition

For the successful conduct of painting works , auxiliary substances such as solvents, whose use is necessary for preparing the painted surfaces and giving the required consistency to paint and varnish materials, are of no small importance. In this article we will consider solvent P4, which is one of the most popular and known on the market of similar materials.

General characteristics

Solvent P4 is an organic solvent that is a clear, colorless liquid (in some cases may have a yellowish tinge) without visible suspended particles. Characterized by a specific smell and high volatility. The average value of the relative density of the substance is 0.85 g per cubic meter. See Self-inflammation at a temperature of 550 degrees. It is manufactured in accordance with the standards, which are stipulated in GOST 7827-74. It is produced in industrial containers - plastic and glass containers (bottles) of various volumes.

Solvent P4: composition

P4 is a mixture of three organic solvents, which together become even more effective. Includes the following substances:

• toluene - 62%;

• Acetone - 26%;

• Butyl acetate - 12%.

Due to this composition, the solvent is characterized by sufficiently good consumer properties and high dissolution efficiency of varnishes and paints. An ingredient such as butyl acetate promotes an increase in the gloss of films of applied paintwork materials and prevents their whitening and fading.

Main technical parameters of the solvent

Solvent P4 (GOST 7827-74) has the following characteristics:

• values of the volatility index for ethyl ether are in the range from 5 to 15;

• the number of coagulation is not less than 24%;

• the proportion of water (by mass) is equal to not more than 0.7%;

• the acid number does not exceed 0.07 mg KOH / g.

Also, solvent R-4A is produced. This reagent and solvent P4 are analogues in terms of technical characteristics. However, they differ somewhat in composition, since, according to the requirements of GOST, P-4A does not include butyl acetate. Another difference of these brands is that the solvent of grade P-4A, in contrast to P4, is able to dissolve the enamels of ХВ-124 (protective and gray).

Where is the solvent P4 used?

The reagent is used for the purpose of dilution of paint and varnish materials such as PX LN and LS PSC, the basis for the production of which are polyvinylchloride chlorinated resins, epoxy resins, vinyl chloride copolymers and some other film-forming substances.

How to use - how to properly dilute the paint with solvent P4?

Solvent P4 is added to a certain material (varnish or paint) in small portions until the desired consistency is achieved. Diluted paint (varnish) is required to constantly mix.

After application of the prepared coating, the solvent evaporates and the film-forming substance solidifies into a protective coating. It is important not to allow water to enter the solvent when working with the solvent, since the acetone in the mixture can easily mix with it, which in turn will lead to color distortion or whitening of the transparent coating.

Precautions for working with solvent P4

It should be remembered that the substance belongs to the toxicants and can have a negative impact on the human body, which comes through inhalation, and also penetrates through the skin. At long-term exposure, the negative effect of the solvent on the bone marrow and blood may be possible. In case of prolonged contact with the skin, dermatitis may form.

Considering all of the above, work with solvent P4 should be carried out in rooms provided with good ventilation. It is also extremely important to use protective measures to prevent exposure to harmful substances on the respiratory system, eyes and hands (respirator, gloves, goggles).

P4, like a number of other solvents, is characterized by a high degree of fire danger. The mixture is highly flammable and, in addition, is explosive. The vapors entering into the composition of the solvent, having the property of accumulation, are also explosive. Therefore, the compulsory condition for working with the solvent is compliance with fire safety requirements.