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Why are compostable bags so expensive?

Due to the higher cost of raw ingredients, their decreased availability, and the higher cost of production procedures with smaller batches, compostable plastic bags cost more than standard plastic bags. Growing, cultivating, and turning raw resources like corn, potatoes, and soy into starches for the production of compostable plastic all come with expenses. Then, manufacturing procedures that aim to have lower carbon, emissions, water, and electricity costs are mixed with these increased expenditures. Currently, manufacturing in smaller batches costs more than doing it in bulk. Demand for compostable plastic is always important since more widespread production will drive down costs.

How Is Traditional Plastic Made?

From toys, engineering, and building supplies to food and medicine packaging, plastics are employed in a variety of common products.

  • Plastics come in seven primary categories, with PET being the most popular.

  • PET, a kind of polyethene terephthalate, is frequently used for water and soft drink bottles.

  • High-density polyethene (HDPE) is frequently used for applications that need to be more durable, such as shampoo bottles.

  • Low-density polyethene (LDPE) is frequently employed in softer applications like cling film and supermarket bags.

  • Pipes made of polyvinyl chloride (PVC) are frequently utilised in building construction.

  • Bottles, toys, and auto parts are frequently made of polypropylene (PP).

  • Polystyrene (PS), is a resin used in packaging.

Some of these can be recycled, either simply or through complex procedures. None of them is fully safe for the environment because they need to be recycled in order to be used again rather than decomposing in a landfill or composter.

The Manufacturing Process Of Plastic

In the process of making plastic, there are three key steps:

  1. Ethane and propane are refined from raw sources such as crude oil, natural gas, or plants.

  2. Ethylene and propylene are produced when the two resultant components are heated and "cracked."

  3. A variety of polymers are produced by combining these two substances.

Depending on the type of plastic and its intended use, the production process may vary slightly. Plastic frequently goes through moulding procedures or has colours incorporated for its final result. A vast range of uses, plastic kinds, and part shapes have led to the development of numerous manufacturing procedures.

The heating and cooling procedure can also create "thermoplastics," which are plastics that can be heated and cooled repeatedly without degrading and can be moulded into any shape. This indicates that they can be repeatedly melted and quickly recast or moulded.

Why Are Thermoplastics So Common?

The most popular kind of plastic is thermoplastic, which undergoes several cycles of melting and solidification without significantly degrading. They are typically supplied in the form of thin sheets or pellets that can be heated to take on the shape needed.

Following are examples of typical thermoplastics:

  • Acrylic

  • Polyamide

  • Polycarbonate

  • Polyethene

  • Polypropylene

  • Vinyl chloride polymer (PVC)

  • Butadiene with acrylonitrile styrene

  • the ketone of polyether ether

  • Acid polylactic.

These plastics are frequently used in sporting goods like LEGO®, toys like LEGO®, CDs and DVDs, shampoo bottles, and sports equipment (polyethene).

How Is Compostable Plastic Made?

Compostable plastic is created from natural resources and designed to decompose in the environment using a worm farm, commercial composting facility, or home composter.

A straightforward procedure is used to create compostable plastic:

Collect the materials that contain starch, such as cellulose, soy, potato, and corn starch. In the instance of vegetable cultivation, this might be accomplished.

  • Extract the starch, sugar, and polylactic acid.

  • Heating procedure

  • Moulding.

  • adding dye or curing.

  • The plastic is set.

The cost of compostable plastic bags is increased by this method as the cost of the raw components.

An Example Of A Compostable Plastic Process

Polylactic acid (PLA), a type of compostable plastic, is primarily created by combining fermented food starch, typically from corn, sugarcane, sugar beet pulp, or cassava, with lactic acid and cyclic di-ester lactide.

This implies that a combination is prepared, and the starch—the primary component of compostable plastic—is then removed through fermentation.

The materials that are fermented and used to make PLA are chosen because they are sources of carbohydrates that can be processed in a controlled setting and have the starch removed. The starch is then cooked, combined with enzymes or acid, and broken down into dextrose or corn sugar.

The subsequent fermentation process yields L-lactic acid, a component of PLA.

The Advantages Of Producing Compostable Plastic

Such plastic is practically carbon neutral in production, emits no hazardous fumes, requires less energy than traditional plastic, produces fewer greenhouse gases, and boosts employment in rural regions.

What Are The Most Common Compostable Plastics?

Polylactic acid and crystalline polylactic acid are the two most often used biodegradable polymers. These are frequently created from cornstarch combined with other veggies, making them reusable, compostable, and sustainable. For food service items like silverware, takeout containers, coffee cup lids, and soup containers, CPLA is heat resistant.

Unless charcoal is added to generate a black tint, CPLA is frequently not transparent but rather perceived as white. PLA is used for translucent, clear windows in sandwich boxes or bags as well as cold food service goods including cups, salad containers, deli pots, lids, and bags (like garbage bags).

As non-toxic materials, PLA and CPLA can be used in medical settings like medication delivery systems, orthopaedic devices, and medical implants. Read this article to learn more about PLA and CPLA compostable plastics.

The availability of resources, which frequently depends on farming in rural areas, is also crucial (think corn, soy and potato as materials). These items' use of renewable resources does help to reduce the cost of manufacturing in terms of power and water consumption.

Will Compostable Plastic Become More Popular?

Compostable plastics are growing in popularity as landfill contribution, animal risk, and soil risk associated with conventional plastics are becoming more widely known. Businesses as a whole are changing how they create plastics and the goods they produce.

Compostable packaging choices are being launched into markets all around the world on an annual basis, indicating the growing demand for such alternatives. The following are the current problems with the adoption or proper use of biodegradable plastics:

  • Knowing how to properly dispose of the product

  • Cost and the availability of a large number of biodegradable products could force a complete lifestyle change to bioplastics.


Compostable plastics are becoming more and more popular, offering a fantastic replacement for conventional plastic that will reduce your environmental effect. These plastics are great for decomposing into their natural compounds when properly disposed of because they are created from renewable and natural resources.

There are seven different types of common plastics, and thermoplastics are used in many everyday items including water bottles, packaging, and even toys and sporting goods. Unfortunately, a lot of conventional plastics cannot be recycled and end up in landfills as well as being harmful to soil and wildlife.

Although they are a fantastic substitute for these plastics, compostable plastics cannot take the place of all the uses for which they are currently used. It is hoped that as demand for these products grows, more resources become available, and availability rises, prices would fall.

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