Category Archives: Application

Study on Recycling of Polystyrene Foam that We Should Know

Polystyrene foam (EPS) plastic with low density, high specificity, low water absorption, acid and alkali, good insulation, shock, can be decorated, easy to shape, etc., which makes it a rapid development, and is one of the most widely used plastics in the world today.EPS Polystyrene

EPS applies in the home appliances, office machinery buffer packaging materials, containers and disposable tableware, etc. are used in large quantities as a one-time use of packaging materials, because of light weight, large size, with anti-aging, corrosion and difficult to be biodegradable. However, it dealing with a major problem, causing serious environmental pollution.

According to the relevant policies of the state, in response to the unified development of economic development and environmental protection, we must take the road of sustainable development of resources and sustainable development of the abandoned EPS for recycling. EPS densifier is the main EPS recycling equipment. Harden and Hasswell can offer EPS densifiers with competative prices. EPS densifier reduces EPS volume by 50 times by auger compaction, thus greatly saves transport and disposal costs. We can offer EPS densifiers with four models and also can tailor-made EPS recycling solution.

EPS Densifier

EPS Densifier


Comparing Polystyrenes: Looking at the differences between EPS and XPS

Insulation is a critical component to specify when designing a functional, cost-effective, and energy-efficient building. One method to insulate a building is by installing 50 to 152 mm (2 to 6 in.) of rigid foam insulation on the exterior side of the wall framing. Two of the most frequently installed types of rigid foam insulation are expanded and extruded polystyrene (EPS and XPS). Both serve the same basic function: providing a means to manage the passage of heat in a building system. However, they differ in important ways.



The primary responsibility of any insulating construction material is to offer positive thermal performance. However, this is not the only factor to account when specifying a rigid foam insulation material. It is also critical to know how it will perform under several situations.
XPS is manufactured in a continuous extrusion process that produces a closed cell form of foam insulation. EPS, on the other hand, is manufactured by expanding spherical beads in a mold and then using heat and pressure to fuse the beads together.
Each product has proponents claiming one out performs the other. However, it is key to understand each product may be more suited for a particular use than the other. This can be made clearer by examining each product’s thermal and moisture protection, fire and water resistance, and implications for sustainably designed projects.


Recycling EPS Foam – Is the Sky Falling?

Recycling EPS is No Myth!

We all remember the fable of Chicken Little and “The sky is falling!”. Chicken Little truly believed the sky was falling and went on a journey convincing others of this ghastly news. There are many different versions of this fable that is centuries old, but the moral remains the same: Do not jump to conclusions and then spread them like they are facts until you have all the information or facts Sadly today, when it comes to recycling expanded polystyrene (EPS), we have many “Chicken Littles” saying “You can’t recycle EPS.”

First things first. What exactly is EPS? EPS is expanded polystyrene foam. It is the white rigid foam that is commonly, but incorrectly referred to as Styrofoam. “Styrofoam” is a Dow trade-name, an extruded polystyrene, and it is actually blue in color. Why are there so many misconceptions about this versatile product? To start, both EPS and Styrofoam have different properties and uses. Unlike the blue foam (Styrofoam), the white foam (EPS) is indeed recyclable! The uses of EPS are virtually endless, ranging from insulation for coolers all the way to a soil substitute known as Geofoam. This recycled product has a variety of uses, from glue to park benches. In fact, not only is it recyclable, but there are also several different methods to do so. Take a look below.

The Grinder

One method of recycling EPS is grinding. Harden Industries can offer the grinder.  Waste polystyrene foam are emptied into the grinder and then moves through a de-duster. The ground particles are then reincorporated into manufacturing process to produce 1# density blocks. The ground product, or “re-grind”, is also sold to the horticulture industry to add to the soil of potted plants. The dust that is collected in this process is cubed and sold to vendors that make picture frames, park benches, trash cans and more.

EPS Grinder

EPS Grinder


Another way to recycle EPS is to densify the product into solid logs or blocks. EPS densifier plays an important role in densifying process. EPS densifier can take large volumes of EPS scrap and extrude it into a small volume. The end use for this product is similar to the dust blocks but also includes surfboards. According to Harden Industries, a EPS recycling equipment provider, the volume reduction is 50:1.

EPS Densifier

EPS Densifier

EPS Foam – Who Says It’s Not Recyclable?

There are two common misconceptions of expanded polystyrene, (EPS).

The first one – that it’s  called Styrofoam™.  Styrofoam™ is a Dow trade name and is actually blue in color.

The second one – it is not recyclable.  It is indeed recyclable and has many uses in its recycled state.

There is no need for EPS foam to end up in landfills. It can go back into the manufacturing process of foam blocks or packaging or it can be compacted and densified to create totally new products.

Harden EPS densifier is a better solution to recycle and densify EPS. Harden EPS densifier uses innovative technology to compress bulky foam waste EPS extremely efficiently into easy to manage, stackable blocks – with no re-expansion. The extreme reduction in volume achieved 50:1.

EPS Densifier

EPS Densifier

Densified EPS foam is reincarnated into such products as coat hangers, garbage cans, plant pots, garden furniture, disposable cameras, park benches, picture frames, cd cases, cassette casings, glue and much more.


Benefits of EPS Recycling

An interesting use of recycled EPS is a product that looks like wood and can be used for park benches and fence posts. The material costs less than hardwood and can be used instead of woods such as mahogany and teak, which are harvested from rainforests.

Making EPS requires petroleum, which is a non-renewable resource. So, recycling EPS reduces the amount of oil needed for the manufacturing process. This is not a pure gain, of course, because some energy must still be used to transport and reprocess the material.

The most visible benefit of EPS recycling is in the reduction of litter both on land and in the sea. EPS, which is not affected by oxygen, sunlight or water, stays around indefinitely. Municipalities have to spend money to clean it up. That’s why a number of cities, including San Francisco and Seattle, have banned styrofoam in take-out food packaging. Continue reading

Improving EPS Recycling by Using EPS Densifier

EPS recycling provide a significant landfill benefit by saving space.

Adding a thermal EPS densifier unit helps improve the economics of expanded polystyrene recycling. It increases the density and ability to ship, improving marketability.

The EPS cold densifier is also a better choice to recycle EPS. It handles clean, white foam, and stores compacted plastic indoors. Though the density is less than thermal EPS densifier, cold densifier hasn’t bad smelt and it saves energy.

Harden, one of leading EPS recycling equipment manufacturer from China, offers EPS densifiers with varied feed hoppers, throughputs and densities. Please feel free to contact at eps-compactor(at) for any questions about EPS recycling.

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