Toyota BSDH 1562G Grease Stain Resistance Test Method for Interior Parts Paint

The “Toyota BSDH 1562G Grease stain resistance test method for interior parts paint” standard developed by Toyota Automotive Company describes a test method for determining the resistance of paint used in vehicle interior parts to grease stains.

Grease stain resistance generally refers to the ability of a material surface to resist the effects of dirt and to retain its original color and gloss. Stain-resistant coatings are desirable for the fiber and textile industries and are also finding new applications in the plastics and construction industries. Improving the water and oil repellency of surfaces makes them easier to clean, reduces maintenance costs, preserves their natural appearance, and increases their weatherability and chemical resistance.

Resistance to staining is generally determined by keeping test solutions in contact with coating surfaces for a specified period of time. After exposure, the surface is cleaned in a defined manner and test samples are visually inspected for change.

Instead of a brightly colored stain, the oil leaves a greasy stain that is slightly darker than the surrounding fabric. The danger with greasy stains is that the longer that grease stain is left unattended, the darker it will become over time, and if left too long, it can set permanently.

Grease is a solid or semi-solid lubricant formed as a dispersion of thickening agents in a liquid lubricant. Grease usually consists of a soap emulsified with mineral or vegetable oil.

International standards divide greases suitable for the lubrication of vehicle chassis components and wheel bearings into categories according to their performance requirements:

• Chassis lubricants (light and heavy duty)
• Wheel bearings (light, medium and heavy duty)

A given performance category may contain greases of different consistencies.

Oil and grease can easily penetrate paint layers, causing discoloration, corrosion and stains. Removing grease from a paint surface is arguably one of the most challenging and time-consuming tasks and is a key factor in achieving results.

It’s important to understand why oil and grease-based compounds can be so damaging to car paint. Grease and oil can effortlessly seep into paint layers, causing discoloration, corrosion, and stains.

Grease is a semi-fluid, solid substance formed by the combination of a liquid lubricant and a thickening agent. This combination results in a product that provides continuous lubrication to machine parts and remains in place, unlike the more fluid oil.

The main components of grease include:

• Base oil (70-90 percent): This is the primary lubricant. Most greases use mineral oil because of its satisfactory performance in a variety of applications. However, in environments with extreme temperatures, synthetic base oils are preferred because of their improved stability.
• Additives (1-10 percent): These are essential in enhancing the natural properties of the grease. Common additives include oxidation and rust inhibitors, extreme pressure agents, antiwear and friction-reducing compounds. They help the grease withstand harsh industrial conditions.
• Thickeners (5-20 percent): Thickeners give a grease its unique consistency. They are usually metallic soaps such as lithium, calcium or complex substances such as polyurea. The thickener acts like a sponge, holding the base oil and additives together, thus determining the grease's overall performance and suitability for specific applications.

Among the numerous tests, measurements, analyses and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the “Toyota BSDH 1562G Grease stain resistance test method for interior part paint” standard with its trained and expert staff and advanced technological equipment.