We find out what tests and inspections paint materials must pass before they reach the store shelves.
– Under the control or quality control of paint and varnish materials is understood the procedure for their testing by GOST methods, internal methods of companies and comparison with the normative indicators of normative documentation of technical specifications, GOST for products, industry standards or customer requirements, “says Tikkurila Director for Development, Modernization and Innovation “, The representative of the Association of the Quality of Pain Alain Rozhkov.
Testing of paint and varnish materials can be carried out by accredited (can provide services to third parties) or certified laboratories (production laboratories that produce products). Assessment of the conformity of the laboratory is conducted in the national body of the Federal Service for Accreditation (Rosakcredit) and obtains an Accreditation Certificate or a Certificate of Attestation.
So, what do experts pay attention to?
Compliance with regulations
The tested paintwork materials must comply with their normative documentation, the Unified Sanitary and Epidemiological Requirements of the EurAsEC (Customs Union) and the RF Government Decree, for example, mandatory declaring of alkyd and enamels of anticorrosive primers.
If there is an indication that the product corresponds to the parameters of a particular GOST, then the check is carried out for compliance with this GOST. If the product meets its specification, then the test is carried out for compliance with the manufacturer’s specifications. For decorative materials, it is sufficient to comply with the parameters of TU or GOST. Adherence to international requirements for parameters is voluntary.
Documents for reviewers
Verifying organizations are guided by the decisions of the Government of the Russian Federation, the decisions of the TC Commission, the current legislation of the Russian Federation (Federal Law on Standardization, Federal Law on Technical Regulation, Orders of the Ministry of Industry and Trade, etc.) and product documentation.
For decorative materials, it is sufficient to comply with the parameters of TU or GOST
Quality control stages
The quality control of production at the production is carried out in phases and passes through several stages. During the manufacture of the paint, the degree of grinding is determined several times (how dryly the dry components in the paint are finely grinded) in order to determine when the material is ready for further testing. When the necessary degree of grinding is achieved, the appearance of the paint in the volume, the appearance of the coating, and the viscosity of the material are determined. If the parameters do not correspond to those declared in the normative documentation, the paint is additionally dispersed with the addition of the necessary components (if necessary).
If the primary material parameters correspond, then the paint is tested according to the remaining criteria, for example, the mass fraction of non-volatile substances, drying time, color characteristics, etc.
In the first place, such parameters of paints as the degree of grinding, appearance, viscosity
Signs of quality
For paint, important parameters are the ability to form a uniform coating, without defects, covering the surface in 1-2 layers.
For a primer is the ability to improve adhesion (the ability of adhesiveness of paint to the substrate), to reduce the consumption of subsequent layers of paint.
For putty – this ability is applied evenly, without defects, not flaking, it is good to grind, do not hammer the sandpaper, fill the surface irregularities, have minimal shrinkage.
Russian state standards GOST declare the safety of paint and varnish materials, for example it is forbidden to use methanol and heavy metals (mercury, cadmium, arsenic) in accordance with GOST 52491-2005 “Paintwork materials used in construction.”
GOST 33290-2015 contains requirements for the content of VOCs (volatile organic compounds) and sanitary and chemical requirements for the migration of harmful substances determined in the air. The restrictions on the content of VOC coming into force from 1.01.2020 comply with the requirements of the European Directive 2004/42 / EC.
NP “Ecological Union” – the Russian environmental certification body conducts an environmental safety assessment of paint and varnish products on the basis of requirements comparable to European requirements. It should be noted that each country develops its requirements for the environmental safety of goods and services, in relation to its legislation, the level of development of the paint and varnish market.
In our country there is an organization called the Association of Paint Quality. They in their Safety Standards rely on Russian and international legislation, and Directives, for example, members of the Association have abandoned the use of raw components containing alkyl phenol ethoxylate-toxic substance, banned in Europe and polluting water resources.
Accordingly, if you see a sign on the bank with a paint, it is a signal that the paint is checked for quality and safety.
Methods of testing
To check the quality of the material, physico-mechanical methods for measuring quality parameters are most often used, for example: viscosity, hiding power, drying time, resistance to wet abrasion, adhesion, impact resistance, elasticity.
Chemical (analytical) methods for determining the composition of paintwork materials, such as chromatography-mass spectroscopy, the titrimetric method, can also be used.
To determine the service life of the coating, accelerated laboratory and long-term field tests are used. In the laboratory special instruments simulate different climatic conditions. In full-scale tests, the material is tested in a climate similar to the recommended one, with an assessment of the change in the decorative and protective properties of the coating.
The same Association of Paint Quality conducts a planned work to create new and improve existing GOSTs for testing methods for varnish-and-paint products, taking into account international experience in the industry. In 2015, the Association paid for the creation of 2 GOSTs on the basis of ISO international standards for the determination of vapor permeability and water absorption for facade paints. In 2016, the Association participated in the creation of the Standard of the Russian Quality Mark for the paint and varnish products and determined the requirements for the quality and degree of localization of the coatings. In 2018-2019 the Association plans to finance the creation of the GOST on the method for determining the covering ability on the basis of ISO 6504-3.