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By:

Dr. Sanjay Joshi

31 August 2024 at 3:05:29 pm

From PVC to LDPE: The Plastics Hidden in Everyday Life

From packaging to household goods, RIC 3 and 4 plastics are everywhere. Learn how to identify them at a glance. Dear Reader,In my previous article, we explored the first two Resin Identification Codes— RIC 1 (PET) , commonly used in beverage and food containers, and  RIC 2 (HDPE) , found in sturdy household bottles and a wide range of utility products. Both plastics are among the easiest to recycle, making them central to responsible waste management and to the broader shift towards more...

From PVC to LDPE: The Plastics Hidden in Everyday Life

From packaging to household goods, RIC 3 and 4 plastics are everywhere. Learn how to identify them at a glance. Dear Reader,In my previous article, we explored the first two Resin Identification Codes— RIC 1 (PET) , commonly used in beverage and food containers, and  RIC 2 (HDPE) , found in sturdy household bottles and a wide range of utility products. Both plastics are among the easiest to recycle, making them central to responsible waste management and to the broader shift towards more sustainable patterns of consumption. With this foundation in place and a clearer understanding of how these codes guide our daily choices, let us now move on to the remaining classifications in the Resin Identification System and understand what each one signifies. Code 3: PVC (Polyvinyl Chloride) Code 3 refers to products made from polyvinyl chloride, or PVC—a remarkably versatile and inexpensive plastic valued for its durability, water resistance, and excellent electrical insulation. As the world’s third most produced plastic, PVC is manufactured in both rigid and flexible forms, each designed to meet a wide array of everyday needs. Flexible PVC, produced using plasticisers, appears in raincoats, boots, shower curtains, handbags, and imitation leather upholstery. It is also used in bottles for non-food items such as shampoos and cosmetics, in clear blister packaging for medicines, and in cling film that helps preserve the freshness and quality of food. Rigid PVC, prized for its strength and longevity, is used to manufacture credit cards, debit cards, national identity cards, and various inflatable items—from pool toys and floats to air mattresses. It is also present in yoga mats, sports equipment, and numerous DIY and craft materials that require durability and ease of handling. One of the most significant industrial uses of PVC is in piping. Rigid PVC pipes have increasingly replaced metal pipes in water supply, sewage, and drainage systems due to their resistance to corrosion, leakage, and environmental wear. Unplasticised PVC (uPVC) is widely used for window and door frames, offering excellent insulation, weather resistance, and minimal maintenance requirements. Vinyl flooring—produced as tiles, sheets, or planks—is another major PVC-based product, valued in homes, offices, and hospitals for its durability, affordability, and ease of cleaning. PVC’s strong insulating properties also make it ideal for coating electrical wires and cables, while PVC membranes and siding provide long-lasting, weather-resistant coverings for roofs and exterior walls. Although PVC can be recycled, the process is considerably more complex than with many other plastics. The numerous additives used to improve its flexibility, strength, and stability often interfere with the recycling process and can reduce the quality of the recycled material, limiting its suitability for certain applications. Code 4: LDPE (Low-Density Polyethylene) Code 4 identifies products made from low-density polyethylene, or LDPE—one of the most widely used plastics thanks to its lightness, flexibility, and overall durability. LDPE is commonly found in stretchable grocery bags, shopping bags, and general-purpose garbage bags. It is also extensively used in milk pouches, bread and frozen-food packaging, cling film, snack and toiletry pouches, and other everyday wrapping materials. Many squeeze bottles for glue, paints, condiments, and household liquids are made from LDPE, as are numerous lids and caps. Additionally, LDPE forms the waterproof inner lining of juice and milk cartons, helping protect the contents and extend shelf life. Beyond packaging, LDPE serves as a protective coating in various products, appears in trash-can liners, and is widely used in children’s toys such as buckets and play balls due to its resilience and safety profile. Some household goods—including certain cutting boards—are also manufactured from LDPE, benefiting from its strength and ease of cleaning. Despite its versatility and widespread use, LDPE poses notable challenges for recycling. Rigid LDPE products are somewhat easier to process, but thin bags, wraps, and cling films are difficult to collect, separate, and recycle efficiently. As a result, a significant proportion of these items unfortunately ends up in landfill. Our discussion will continue in next week’s instalment, where we will explore the remaining Resin Identification Codes in greater depth and understand how they influence recycling practices. Until then, I wish you a pleasant and enjoyable weekend.   (The author is an environmentalist. Views personal.)

The Drone Fleet is Coming, And India is Not Ready

Updated: Mar 20

Drone carriers are not a niche technology that India can afford to ignore, and any delay in developing these compromises our geopolitical standing.

Drone Fleet

When Iran recently unveiled its first drone carrier warship, the Shahid Bagheri, it caught the world off guard. A converted commercial vessel now capable of launching squadrons of drones, helicopters, and cruise missiles, the Bagheri has a range of 22,000 nautical miles, significantly expanding Iran’s maritime reach. More than just a new warship, it signals a shift in naval strategy: the rise of drone carriers as cost-effective alternatives to traditional aircraft carriers. And while nations race to build and deploy these game-changing vessels, India finds itself lagging dangerously behind.


The idea of a drone carrier is not new. In essence, it is a naval vessel, either manned or remotely operated, with a flight deck that enables the deployment of drones, helicopters, and missile systems. Unlike conventional aircraft carriers, drone carriers are significantly cheaper, requiring neither manned fighter jets nor the extensive logistics of pilot training and maintenance. This cost-effectiveness has made them an attractive proposition for many countries, particularly those looking to expand their naval capabilities without breaking the bank.


As is often the case, the United States was the first to seriously explore the drone carrier concept. In 2013, DARPA (the Pentagon’s advanced research agency) began developing a fleet of small naval vessels capable of launching and recovering combat drones. The U.S. Navy has since made significant progress in integrating drone operations into its naval fleet, setting the stage for a future where swarms of unmanned aircraft could redefine maritime dominance.


Other nations quickly followed. In February 2021, Turkey adapted its amphibious assault ship TCG Anadolu, originally intended to deploy F-35B fighter jets, to operate UAVs instead after its removal from the F-35 program by the United States. In November 2024, Turkey successfully launched and recovered its Bayraktar TB3 UAV from the vessel, marking a historic first. This single achievement has significantly bolstered Turkey’s naval deterrence.


China, never one to be left behind in military innovation, launched its first unmanned drone carrier, Zhuhai Cloud, in 2022, officially designating it for maritime research. However, observers suspect military applications. In May 2024, satellite imagery revealed the construction of another drone carrier in China’s Jiangsu Dayang Marine Shipyard - a catamaran-hulled vessel with a low flight deck. The exact nature of its capabilities remains unclear, but one thing is certain: China is committed to mastering drone carrier technology.


Portugal, South Korea, and the United Kingdom are also making steady progress. The UK, in particular, has partnered with the Royal Institute of Naval Architects (RINA) to develop a drone carrier strategy that could transform its naval doctrine.


And then there is India, currently reduced to watching from the sidelines.


Despite its growing regional ambitions and maritime interests, India has yet to make significant strides in drone carrier technology. Its long-range UAV programs remain underdeveloped, hindered by an inefficient defence procurement system, inadequate research and development funding, and an overreliance on the Defence Research and Development Organisation (DRDO) and state-owned enterprises. Private sector participation in defence manufacturing remains stifled, further slowing progress.


Meanwhile, China continues to invest heavily in both its own naval capabilities and those of its allies. It has already helped Pakistan and Bangladesh strengthen their economic and military infrastructure, exacerbating India’s security concerns.


Given these realities, India must act fast. The country’s strategic focus has long been on developing its submarine fleet as a counter to China’s growing naval presence. While that remains crucial, aircraft carriers, costly to build and maintain, may not be the best investment in an era where drones and unmanned systems are reshaping warfare. Instead, India should consider a more pragmatic approach: a fleet of drone carriers capable of conducting surveillance, reconnaissance, and offensive operations at sea.


A well-developed drone carrier program would allow India to counter asymmetric threats, offset its numerical and technological disadvantages against China, and project power across the Indian Ocean and Indo-Pacific regions. It would enhance deterrence, making adversaries think twice before engaging in naval provocations.


More importantly, drone carriers are not a niche technology that India can afford to ignore. Their proliferation in the Indian Ocean is inevitable, and any delay in developing this capability will compromise India’s geopolitical and military standing. As drone carriers gain prominence, military budgets worldwide are shifting towards UAV technology, naval electronic warfare, and counter-drone measures. The unpredictability of unmanned warfare is introducing new uncertainties, heightening geopolitical risks and making conflicts more volatile. Even the world’s most powerful navies are rethinking their reliance on traditional carrier fleets as cost-effective drone carriers become operationally viable.


India must recognize these shifts and adapt on its own terms, rather than being compelled to do so out of necessity. The alternative is strategic irrelevance in an era of rapidly evolving military technology.


The ancient strategist Sun Tzu once observed, “Opportunities multiply as they are seized.” For India, the opportunity to lead in drone carrier technology is slipping away. If it fails to act now, it will soon find itself playing catch-up in a world where naval warfare is no longer fought solely by manned warships, but by swarms of drones launched from nimble, cost-effective carriers.


(The author is a retired naval aviation officer and geo-political analyst. Views personal.)

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