The skin of aircraft is coated with polyurethanes to provide protection, resist damage and guard against extreme changes in temperature in short spaces of time—like the heat of the airport tarmac to the freezing temperatures found at 40,000 feet.
How do polyurethane-based composite parts compare with vinyl esters or polyesters?
BASF urethane composites add strength while reducing weight in all kinds of RV and ATV components. This includes better impact resistance, similar HDT (Heat Deflection Temperature) and 25% less weight than parts made of vinyl esters or polyesters. BASF composites also offer molding efficiencies, reduce emissions during molding and eliminate VOCs.
How do polyurethane coatings protect the vehicle?
BASF’s Elastocoat® is not a superficial coating for aesthetic appeal only. It provides a new skin—high in mechanical resilience and resistant to both chemical and climactic impact—and gives a high-gloss, scratch-resistant layer over the car’s paintwork to help resist the effects of heat, cold, rain, burning sunshine and mechanical stress . Coatings are also used on windscreens to provide greater strength.
What is Cellasto®?
This microcellular polyurethane elastomer is used to create auxiliary springs, support bearings and chassis components. Its excellent characteristics ensure a reduction in NVH and a clear increase in comfort and road dynamics. BASF is the world leader in microcellular polyurethane components.
How are Cellasto® components made?
Cellasto® components are based on a cellular polyurethane elastomer. The molded components are produced in a closed-mold foaming process. They are high resilient spring- and damping elements with the following characteristics: high compressibility, low compression set, very good static and dynamic long-run behavior, wide application area from -30°C to +80°C ambient temperature and excellent durability and chemical resistance.
How does Cellasto® compare with rubber?
Compared with rubber, Cellasto MPU parts exhibit excellent dynamic durability, high volume compressibility, low compression set, excellent low temperature flexibility and consistent performance over time. Parts made of Cellasto MPU are lower in weight than rubber parts of comparable size.
What are the characteristics of Cellasto®?
The outstanding features of Cellasto® are:
What are the progressive deflection characteristics of Cellasto®?
The density of these moldings range from 350 kg/m³ to 650 kg/m³ depending on the mass of material used. Their cell volume amounts to 63% to 50% of the molding volume. The cell diameter amounts to tenths of a millimeter and the cells can be open or closed depending on the density. Compression loads first compress the cell volume and later the material itself. It therefore becomes harder as compression increases.
What is the lateral expansion and volume compressibility of Cellasto®?
Compact elastomers such as rubber, for instance, respond to compression with high lateral expansion. Cellular polyurethane elastomers, however, only create very low lateral expansion.
How does Cellasto® react to temperature?
Like all other elastomers, Cellasto® components gradually harden as temperature goes down.
Do I need to take creep into consideration when using Cellasto®?
When dimensioning Cellasto® mouldings the so-called creep - compression increasing over time under constant load - must be taken into consideration.
Does Cellasto® aid in amplitude-selective damping?
Yes. For many applications in the NVH (Noise Vibration Harshness) area, low damping with small amplitudes and high frequencies is essential for improved isolation.
How are spring aids using Cellasto® connected?
The steel coil spring is located between an upper and a lower spring cup, which are inclined towards one another. This spring takes on the shape of an arc.
How do Cellasto® spring aids work with pneumatic springs?
The pneumatic spring is reduced in size in accordance with the load taken on by the spring aid. Because of Cellasto's negligible lateral expansion, the flow holes are not closed - even if the spring aids deflect to the maximum. Cellasto spring aids have sufficient emergency operation properties and can take over all of the suspension work should the pneumatic spring fail.
How do Cellasto® top mounts improve comfort?
In contrast to conventional bearings, Cellasto top mounts ensure better damping of the inherent wheel frequency and less absorption in the frequency range. Irritating vibrations are reduced and the ride is more comfortable.
How do I design Cellasto chassis bearings for a multi-link suspension system?
Mounts exposed to a low torsional load can be designed as almost pure tension-compression bearings.
How do run-flat tires using Cellasto® work?
The run-flat-tire developed especially for BMW by BASF Polyurethanes ensures driving safety. This wheel in a wheel ensures a safe continuation of the journey even in cases of destroyed and pressure-less tires, even at speeds of up to 50 mph (80 km/h). When things get tight the Cellasto wheel assumes the supporting function of the tires.
How does thermoplastic polyurethane (TPU) help extend the life of ABS systems?
Drivers rely on their anti-lock brake systems for safety. TPUs help ensure those systems do their jobs, thanks to creep resistance, tear/cut resistance, moldability and excellent adhesion characteristics. For ABS cables, add low-temperature flexibility, long-term flexibility, abrasion/cut/tear resistance, hydrolytic stability, microbial resistance and oil/fuel resistance.
Can Cellasto® help optimize spring isolators?
Whether they are designed to accept steel coil springs or to isolate pneumatic springs, isolators also have to absorb and isolate the bearing pressure of the spring aid and support bearing.
How can Cellasto® increase the life expectancy of hydro bearings?
In the case of conventional hydro bearings, the rubber end stop, which is subject to high dynamic loads, can wear away through friction. This results in the bearing ceasing to work properly before its time. So the usable life of the hydro bearing needs to be extended without the component geometry being changed. This can be done using an end stop (clip) made of Cellasto®, which is extremely resistant to friction.
How does polyurethane foam help improve fuel efficiency?
Polyurethane helps reduce vehicle weight without sacrificing strength and durability. BASF's innovative polyurethane composite systems are being used to reduce the weight of load floors in a variety of vehicle types and platforms. From incredibly thin honeycomb cores encapsulated in LFI (long-glass fiber injection) polyurethane, to rigid polyurethane foam cores sandwiched between hardboard skins, BASF offers an affordable solution for every load floor application.
Far stiffer than traditional polypropylene floors and far lighter than hardboard floors, load floors made with polyurethane composites take mass out of your vehicles while improving strength.
In addition, the design flexibility offered by polyurethane helps enhance aerodynamics and reduce the weight of mudguards, bumpers, door sills, spoilers, hoods, wing mirror housings and roof modules.
Can polyurethane improve big rig ergonomics?
There are many factors to improving ergonomics in heavy trucks, and polyurethanes contribute in many areas. Acoustic foams minimize road and engine noise, creating a comfortable working environment for the driver, while sound deadening carpet underlay keeps road noises from penetrating the cockpit. For a firm and secure grip that is comfortable for miles on end, big rig steering wheels are made with Elastofoam® integral skin.
Long distance professional drivers need seats and bedding that are comfortable and durable, as well as supportive to reduce ergonomic strain. Elastoflex® provides exceptional support and resiliency, so it’s as comfortable on the first mile as it is on the last. The sleeping cabin is the driver’s home on the road and has to be comfortable, attractive and secure.
BASF polyurethane composites incorporated into the walls ensures sleeper cabins are well insulated from weather and noise. Incorporating Elastoskin® plus Elastoflex® provides truck designers with the flexibility to create warm, comfortable and durable cabin walls in almost any color, grain or texture using a single, in-mold process.
Is there any danger of Volatile Organic Compounds (VOCs) in car interiors when using polyurethane foam?
Elastoskin systems and Elastoflex PUR foams boast lowest-in-class volatile organic compound (VOC) emissions—much lower than 100ppm—in any formulation, customized to your specifications.
How does polyurethane foam help reduce vehicle noise?
Noise comes from a variety of sources—the road, the engine and the world outside a car or truck. Elastoflex PUR acoustic foams are used as backing foam for interior applications keep outside noises outside—where they should stay. And when it comes to engine and powertrain components, Elastoflex foam can be integrated with polyurea spray skin to silence noise at the source, reducing sounds emitted into the cabin or into the environment
What are the benefits of thermoplastic polyurethanes (TPUs) for automotive seating?
TPUs for foam-in-place seats offer significant tear/cut/abrasion resistance, adhesion to fabric, barrier properties, low temperature flexibility, hydrolytic stability, resistance to weathering and color stability.
Large ocean going ships and tankers achieve superior mechanical stress properties on their hulls with the Sandwich Plate System (SPS) , where polyurethane foam is injected between the inner and outer hull plates, increasing strength and rigidity. SPS allows a vessel’s hull to absorb impact energy and keep the ship operational.
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