RoHS is a mandatory standard regulated by EU legislation, which imposes strict restrictions on toxic and harmful substances in products. All designated products exported to EU countries must obtain certification.   With the development trend of economic globalization and product export, based...

How water and working environment affect polyurethane? Water has two effects on polyurethane elastomers. One is the plasticization of water, that is, water molecules enter into macromolecular chains and form hydrogen bonds with polar groups in polymer molecules, which weakens the interaction...

Generally speaking, the oil resistance of polymers refers to the general oil resistance including solvent resistance, which is in principle adapted to the expansion equilibrium formulation developed by Flory et al. That is to say, only expansion occurs, and only equilibrium of expansion occurs. Chemical...

Polymers have good dielectric properties and are widely used as insulating materials. The physical quantities representing dielectric properties include dielectric constant, dielectric loss (tan_ delta), volume resistivity (p_ v), surface resistivity (p_ s) and breakdown strength (or breakdown voltage)....

What are disadvantages of polyurethane and how Pepsen avoids them? High Temperature and Build-up heat Normal polyurethane can work long time under temperature 80 degree C, work temporarily under 120 degree C. It will also create a build-up heat easily when it is compressed back and forth...

What is the difference between polyether and polyester urethane?   There are many kinds of polyurethane.They can be separated into two main categories as polyester and polyether polyurethane according to variety of polyol. They have their own advantages and disadvantages, so there is no better one...

Polyurethane is well known for its excellent abrasion and impact resistance, so it is usually chose by engineers to use them to stop, support, bearing load, absorb shock and clamp.   However, they can be classified as many kinds though all of them are called polyurethane pad. Based on different...

Pepsen has been in this industry since 1996 and committed to export business from 2009.   In order to have better communication with International customer, Pepsen joined Alibaba as golden membership since 2009 and it has been 10 years since then. During this time, we are honored to...

Newly equipped with the 3rd polyurethane elastomer casting machine   Generally there are two ways of casting polyurethane, hand casting and machine casting .They have their own advantages and disadvantages.   Hand casting is more flexible, it is usually used for low volume...

FAQ: Are polyurethanes resistant to heat?   Heat resistance is rarely raised for casting polyurethane, because dynamic performance is the only disadvantage of urethane. Especially under the condition of high speed and high load, the build-up heat will destroy urethane quickly, that is...

What's the difference between rubber and urethane bushings? Urethane is a relatively new material invented by Doctor Bayer around 1935. Urethane bushings are commonly used in car’s suspension, steering, and wheel components to prevent sound and vibrations.   There are many...

FAQ: What is “Cast Urethane Parts”? It always makes people confused about these words even if they have been worked in urethane industry for several years. There are two meanings of “cast urethane parts”: #1 One always comes up with master...