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cicoop6 11 дней назад #

Truck tires can be used on a truck, SUV, or CUV. While offering some heavy-duty or off-road capability, truck tires do come with improved handling, ride, and noise capabilities over off-road, all-terrain, or mud tires.

Steer Position Tires are the most important tires on your truck, designed to perform their best in the front (steer) axle position. They influence handling and ride, offering ribbed tread designs to help channel water away from the tire.

Drive Position Tires are designed for the drive axles offering maximized traction on various surfaces. It is especially important to consider regional or long haul usage. Closed shoulder drive tires are best suited for over the highway use in higher speed and longer haul operations using tandem axle configurations.

Trailer Position Tire includes all of the free rolling wheels on the typical trailer. These tires do not necessarily need great traction performance, but they do need to withstand the heavy stresses of weight and braking.

A car tire is a construction of hard rubber that fits on a wheel and covers a pocket of air to provide a partial cushion for shocks, plus some level of adhesion to the road surface. Car tires require regular maintenance and care to keep you safely on the road.

As the name indicates, passenger tires are designed for standard passenger vehicles, including lighter trucks and SUVs. These tires ensure a smoother ride and exceptional traction in wet and dry conditions, all while providing adequate load carrying capacity for lightweight vehicles.

SUV tires commonly have an aggressive tread design. They usually have larger tread blocks which allow the tire to deliver excellent traction in off-road terrains. The rugged tread design of the SUV tires is what gives it a longer tread life.

Winter Tires are tires designed for use on snow and ice. Snow tires have a tread design with larger gaps than those on conventional tires, increasing traction on snow and ice. Such tires that have passed a specific winter traction performance test are entitled to display a 3PMSF (Three-Peak Mountain Snow Flake) symbol on their sidewalls. Tires designed for winter conditions are optimized to drive at temperatures below 7 °C (45 °F). Some snow tires have metal or ceramic studs that protrude from the tire to increase traction on hard-packed snow or ice. Studs abrade dry pavement, causing dust and creating wear in the wheel path. Regulations that require the use of snow tires or permit the use of studs vary by country in Asia and Europe, and by state or province in North America.

Off-the-road Tires are a category of vehicle tires that use deep tread to provide more traction on unpaved surfaces such as loose dirt, mud, sand, or gravel. Compared to ice or snow tires, they lack studs but contain deeper and wider grooves meant to help the tread sink into mud or gravel surfaces.

Industrial tires are solidly constructed tires used on the wheels of heavy equipment and machinery in the manufacturing, construction, military, transportation, warehouse, agricultural and production industries. Due to their tough construction, industrial tires are used on large commercial vehicles to support and transport heavy goods or perform tasks in warehouses where these vehicles are used. The most common types of industrial tires are found on large trucks, forklifts, transport vehicles, buses, planes and other heavy industrial vehicles. 

cicoop6 11 дней назад #

PTFE is ideally suited for the labware application because of its legendary resistance to just about anything including strong acids and bases. PTFE labware is also resistant to steam and has a temperature range of use covering the range of -200°C (-390°F) to +300°C (+570°F). Because of the three dimensional structure of PTFE at the molecular level, it is essentially intractable in any solvent, therefore explaining its unique resistance to dissolution in most solvents or strong acids and bases. The helical structure of the polymer chain, which is literally «sheathed» by the F atoms means that more chemically vulnerable carbon-carbon bonds of the chain are fully protected. Because of the very high purity of the PTFE starting material all products exhibit extremely low levels of extractables, even at elevated temperatures. The legendary non-stick properties of PTFE give it yet additional advantages for use in the laboratory.

A PTFE magnetic stir bar is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example.

Chemically resistant PTFE beaker is isostatically molded from virgin PTFE and machine finished to give a smooth surface for ease of cleaning and to eliminate contamination. PTFE beakers with pouring spouts are virtually immune to chemical attack, only attacked by some fluorine containing compounds at very high temperature and molten alkalis metals.

PTFE measuring cylinder is a substitute to glass measuring cylinder, it can be used to measure both acid liquids and alkaline liquids. PTFE has advantages of surface finish, low coefficient of friction, lubricity, high working temperature (up to 260º C), excellent dielectric properties, corrosion resistance.

PTFE crucible is made from chemically-inert ptfe, a synthetic polymer that can be heated to 270ºc without distortion. Crucibles display excellent chemical resistance and even heat transfer. The crucible is resistant to high temperatures and virtually all laboratory chemicals with machine-finished surface for easy cleaning.

PTFE tubes are most widely used as laboratory tube and for applications where chemical resistance and purity are essential. PTFE has a very low coefficient of friction and is one of the most “slippery” substances known.

A PTFE digestion tank is a tank, whose size and appearance varies considerably depending on what it is used for. A household PTFE digestion tank for a single family can have a volume of less than one cubic meter, whereas an industrial-scale unit can easily surpass 5,000 cubic meters.

A PTFE stirring rod is a piece of laboratory equipment used to mix chemicals. It's thicker and slightly longer than a drinking straw, with rounded ends. A stirring rod is used for mixing liquids, or solids and liquids. Stir rods are used as part of proper laboratory technique when decanting supernatants because the contact helps to negate the adhesion between the side of the glassware and the supernatant that is responsible for the liquid running down the side. The rods can also be used to induce crystallization in a recrystallization procedure, when they are used to scratch the inside surface of a test tube or beaker. They can also break up an emulsion during an extraction.

PTFE funnel is made of PTFE resin and sintered by cold pressing of dies. They have excellent corrosion resistance, good self-lubrication and non-adhesion. Therefore, the products are almost resistant to all chemical media, and have the characteristics of wear resistance, pressure resistance, low wiping coefficient and so on. The funnel is used to channel liquids or fine-grained substances into containers with a small opening. What's more, it can be used for pouring liquids or powder through a small opening and for holding the filter paper in filtration. In addition, it can be applied in transferring liquids in small containers.

PTFE tweezers make use of two third-class levers connected at one fixed end (the fulcrum point of each lever), with the pincers at the others. When used, they are commonly held with one hand in a pen grip between the thumb and index finger (sometimes also the middle finger), with the top end resting on the first dorsal interosseous muscle at the webspace between the thumb and index finger. Spring tension holds the grasping ends apart until finger pressure is applied. This provides an extended pinch and allows the user to easily grasp, manipulate and quickly release small or delicate objects with readily variable pressure.

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