Today, few remember why tractors, combines, and other heavy machinery in the Soviet Union were often covered with a white compound. To a modern person, this seems strange, especially considering that such a practice is rarely used now.
Meanwhile, there was a perfectly concrete technical explanation for this solution, which had nothing to do with the machines' appearance.
Agriculture in the USSR played a crucial role in the country's economy. After the war, the state actively developed the agricultural sector, and in the 1950s-1960s, a large-scale project for developing virgin lands was implemented.
Later, in the 1980s, the Soviet Union managed to surpass the United States in terms of growth rates of basic food production. Agriculture itself ranked second after industry in its contribution to national income and gross social product.
After the collapse of the USSR, a significant part of this system fell into decay. Many farms closed, and some agricultural lands were abandoned. Today, the state is gradually trying to restore the industry, but it is still far from Soviet scales.
But the main topic is not so much about the agrarian economy as it is about the machinery that worked in the fields.
Why tires were made white
The main "workhorses" of Soviet agriculture were:
- tractors
- combines
- trucks
- various towed equipment
Many noticed that the wheels of such machines were often covered with a white compound. And this was not done for aesthetic reasons at all.
The problem lay in the storage conditions of the equipment. During the off-season, machines stood idle outdoors for long periods, as there were not enough covered hangars and warm premises.
Tires were constantly exposed to:
- solar ultraviolet radiation
- intense heating during the day
- sharp cooling at night
- temperature fluctuations
- precipitation and humidity
Because of this, the rubber aged quickly. It began to harden, covered with small cracks, and then became unusable.
Why black rubber suffered more
Almost all tires for equipment were made black. This shade appeared due to the addition of carbon black – soot.
This substance improved the strength and wear resistance of tires, but at the same time, it had a downside. The black surface absorbed solar radiation much more actively.
As a result, the following occurred:
- tires heated up significantly during the day
- cooled down quickly at night
- the rubber constantly expanded and contracted
Such cycles created internal stresses in the material's structure. Over time, this led to the appearance of microcracks and accelerated wear, even for equipment that was simply standing still.
The problem was especially noticeable during long storage periods after field work was completed.
How white color helped preserve rubber
To extend the service life of tires, a light protective coating began to be used in the USSR.
The white color reflected a significant part of the sun's rays, which meant the tire surface heated up noticeably less. The rubber temperature became more stable, and the risk of cracks decreased.
This allowed for:
- reducing thermal deformations
- reducing tire wear
- extending the storage period of equipment
- reducing maintenance costs
At the same time, wheels were usually not painted with ordinary paint. Most often, they used:
- lime
- special white protective compounds
The mixture was applied in a thin layer to the outer surface of the tires. Such a coating helped the rubber better withstand the effects of sun and weather conditions.
White tires were used not only in collective farms
Such a practice was applied not only in agriculture.
Tires were also covered with a white compound in the Soviet Army. A significant part of military equipment was also stored outdoors, so tire protection was an obligatory part of conservation measures.
Before long-term storage, machines underwent special preparation, and tire treatment was considered one of the mandatory procedures.
In fact, the white coating became a simple and inexpensive way to increase the service life of equipment in conditions of constant environmental exposure.
Why this is rarely done today
Nowadays, tires are practically not covered with lime. However, the problem of rubber protection has not disappeared.
Currently, other methods are more often used for storing equipment:
- wrapping tires in protective film
- treatment with silver paint
- storage in enclosed spaces
- modern conservation compounds
Later, it turned out that lime coatings could also negatively affect rubber. In addition, modern materials and storage technologies have changed significantly compared to the Soviet period.
Nevertheless, the idea itself proved to be quite rational: the white coating really helped reduce tire overheating and slow down their deterioration during long-term outdoor storage.