More than 20 years ago, the US Army launched a new plastic used in helmets and parachutes to reduce the risk of drowning.

But today, the technology has become a hot topic in the automotive industry, where manufacturers are seeking to improve its performance.

In this story, we’ll explore some of the key features of polypropylene, including its advantages and disadvantages.

More from our sister site, Business Insider:The US Army’s first polyethylenic helmet was designed by the company Renton to protect soldiers from falls in the jungle and to increase their chances of surviving a parachute jump.

Today, most military helmets use polyethylenediamine (PED), which is an acrylic polymer that has a low melting point.

In order to make PED safe to use in helmets, it has to be formulated with higher melting points.

Polyethylene was the first plastic to achieve that, but in the past decade, its performance has declined.

In fact, in some instances, it’s even shown to be a worse candidate for protection than polypropene.

Polypropylene is not the only material that’s suffered from this decline in performance.

Earlier this year, a report from the US Department of Transportation (DOT) estimated that the use of plastic-based foam on military vehicles has reduced their ability to withstand drops by as much as 40%.

In the past few years, researchers have developed new polymers that offer some of these benefits, but also some of their disadvantages.

Polyvinyl chloride (PVC), for example, has been touted as a more durable material for helmet use, but research has shown that the material is prone to breaking down when exposed to extreme temperatures.

It also has an increased likelihood of breaking down in the presence of contaminants.

The biggest advantage of PED is that it has a much higher melting point, which means that it can be molded and molded-like into any shape.

That means it can take a number of forms.

It can be used as a composite material to increase its strength, or it can simply be poured into a mold and used in its original form.

The former is more common, but there are other forms, including polyvinyl oxide (PVA), which was also shown to increase strength in studies.PVC and polyvinylamine (PMA) are two of the most common types of plastic used to make helmets.

The two can be made from the same type of plastic, but they’re often treated differently.

PMA has a higher melting temperature, while PVC has a lower melting point of the two.

In some cases, PMA is even more prone to cracking under pressure.

While PED has a greater melting point than PVC, PMAs are also made from a more toxic material, polyvinylene.

PVA, on the other hand, has a significantly lower melting temperature.

If it were to break down, it would break up into smaller pieces that could be less likely to separate from the body, potentially causing suffocation.

A recent study by researchers at Duke University found that exposure to PMA resulted in higher rates of pulmonary embolism, which is a condition that can lead to death.

PMAs, however, were not found to cause any significant increase in the risk for death or cardiac arrest.

The study also found that the risks of PDA exposure were lower than those from PVC.

While polyvinic acid, also known as PVC, is a common plastic, it is also made of polyvinene.

Polycarbonate, which has a similar melting point to PVC, has also been shown to decrease its performance in tests.

A recent study showed that polycarbonate had the highest rate of mechanical failure in comparison to PVC.

Despite the improvements in performance, PVA remains the most popular choice for military helmets, as it offers a greater durability.

While polyethylENE can be melted at a higher temperature, the melting point for the material falls within the melting range of PVC, meaning that it’s not as effective at breaking down under high temperatures.

That’s one reason why polyethylEN has become the preferred choice for many military vehicles.

While there have been several attempts to reduce PED’s performance, none have come close to matching the durability of polycarbonates.

Researchers have found that polyethylens have a higher susceptibility to cracking and wear.

They have also reported a higher rate of thermal expansion and a greater chance of breaking during the manufacturing process.

Despite these drawbacks, some experts say that the polycarbonated helmets that we use on the battlefield today are still superior to the polyethyleners used in previous generations of military helmets.

In the last few years in particular, researchers at the University of Pennsylvania have found evidence that the polymer used in the helmets we wear today may actually be more effective than polyethyleningated polymers.

In addition, they found that, despite the fact that they have a much lower melting rate, the polyprop