• Plastic ( soft or malleable) at normal ambient temperatures
• A melting point above approximately 45 °C.
• A  relatively low viscosity when melted (unlike many plastics)
• Insoluble in water
• Hydrophobic

We shall be discussing here on the waxes which are only being used in the rubber and plastic industry. Beeswax, perhaps , is the first wax which used by human in the beginning of our civilization, was one of the important renewable source of fuel. The honey comb formed by bees has typical hexagonal geometric pattern (Fig.1). Bees wax is used in tire building drum, if the rubber is too sticky, it can also be used in two roll mill to take care of rubber sticking to the rolls. It is frequently being used in the BC, MC, PC, TB  inner-tube making industry during pre-forming operation in the green stage when inner-tubes are expanded under mild air pressure just before curing in mold.

The main commercial source of wax is, however, crude oil but not all crude oil refiners produce wax. "Mineral" wax can also be produced from lignite. Plants, animals and even insects produce materials sold in commerce as "wax". There are five categories of waxes being used in rubber industries :

• Bees Wax
• Paraffin Wax - made of long-chain alkane hydrocarbons
• Microcrystalline Wax - with very fine crystalline structure
• Chlorinated Paraffin Wax
• Polyethylene Wax
• Chlorinated Polyethylene Wax

The major uses of petroleum based waxes are in rubber, cosmetics and in Candle industry. They are generally white in color but show usual brown color (Fig.2) due to contaminated with oil traces. Two types of waxes, in general, are used in rubber industry, Paraffinic wax and Microcrystalline wax. Its normal dose is 1-3 phr and high level of wax impairs low temperature flexibility and compression set. Rubber compounder considers wax as a very important processing aid because it has following advantages:

• Improves mixing properties

  

   

• Improves dispersion of filler and other ingredients
• Improves extrusion properties
• Improves upon extrudate and calendared surface finish
• Protects surface and acts as antioxidant /antiozonate

Paraffin and Microcrystalline waxes are derived from petroleum. They are easy to recover and offer a wide range of physical properties that can often be tailored by refining processes. Most producers offer two distinct types of petroleum waxes: paraffins, which are distinguished by large, well formed crystals; and microcrystallines, which are higher melting waxes with small, irregular crystals. Microcrystalline wax contains substantial proportions of branched and cyclic saturated hydrocarbons in addition to normal alkanes.

Some producers also sell "intermediate" wax, in which the boiling range is cut where the transition in crystal size and structure occur. Petroleum wax producers also characterize wax by degree of refinement; fully refined paraffin has oil content generally less than 0.5% and fully-refined micro-crystalline less than 3%. Paraffin wax produced from petroleum is essentially a pure mixture of normal and iso-alkanes without the esters, acids, etc. found in the animal and vegetable-based waxes.

Paraffin wax (or simply "paraffin") is mostly found as a white, odorless, tasteless, waxy solid, with a typical melting point between about 47-64 °C  and having a density of around 0.9 g/cm³. It is insoluble in water, but soluble in ether, benzene, and certain esters. Paraffin is unaffected by most common chemical reagents, but burns readily. Paraffin wax is generally unbranched hydrocarbon having carbon above C₁₇ and  are solid at room temperature. Their carbon atoms typically ranges between C₁₇ - C₃₀ and having typical melting point around 60°C. All paraffinic wax are recovered from fractional distillation of petroleum.The name paraffin implies that it contains straight hydrocarbon structure but it has branch also. Branched paraffins are called ‘Isoparafins’ and cyclic parafins are called ‘Cresines’ or ‘Isoceresies’.

Pure paraffin wax dose in rubber compounding varies from 1-3 phr. Pure paraffin wax is rarely used these days in rubber industry as it has oozing character and in excess it causes blooming on green rubber components, that results in reduction in compound tack. They are frequently blended with microcrystalline wax in rubber compounding therefore.

Pure paraffin wax is an excellent electrical insulator, with an electrical resistivity of between 10¹³ and 10¹⁷ ohm meter. This is better than nearly all other materials except some plastics (notably teflon or polytetrafluoroethylene). It is an effective neutron moderator and was used in James Chadwick's 1932 experiments to identify the neutron. Paraffin wax (C₂₅H₅₂) is an excellent material to store heat, having a specific heat capacity of 2.14–2.9 J g^–1 K^–1 (joule per gram per kelvin) and a heat of fusion of 200–220 J g^–1(joule per gram). This property is exploited in modified drywall for home building material.

Microcrystalline waxes: This is produced by de-oiling petrolatum, as part of the petroleum refining process. Microcrystalline wax contains a higher percentage of isoparaffinic (branched) hydrocarbons and naphthenic hydrocarbons. It is characterized by the fineness of its crystals in contrast to the larger crystal of paraffin wax. It consists of high molecular weight saturated aliphatic hydrocarbons with comparatively higher melting point than paraffinic wax. It is generally darker, more viscous, denser, tackier and more elastic than paraffin waxes. The elastic and adhesive characteristics of microcrystalline waxes are related to the non-straight chain components which they contain. Typical microcrystalline wax crystal structure is small and thin, making them more flexible than paraffin wax. It is commonly used in rubber formulation and cosmetic formulations.

Its usual carbon atom ranges from C₄₀–C₇₀ , having comparatively higher melting point (Fig.4) between 80-105 ⁰C because they have higher number of carbon. Common dose in rubber compounding is between 1-3 phr. Some time higher dose of  100% Micro crystalline wax is difficult to process and as a result they are often blended with paraffinic wax for rubber use. Blending is also done for economical reasons as microcrystalline wax is comparatively costlier. Paraffinic wax, having smaller molecular weight bleeds faster in cured rubber article, whereas, 100% micro crystalline wax  will have inherent resistance to faster volatilization and eventually, blended wax will have an intermediate property. Refineries may also utilize blending facilities to combine paraffin and microcrystalline waxes. This type of activity is prevalent especially for industries such as tire and rubber industries.

Higher dose of antioxidant and anti ozonates are always advised to add along with microcrystalline wax because the later help slower migration of antioxidant and antiozonates on the product surface and thereby increase on the product durability against ageing process. Tire curing bladder is often blended with 1-3 phr of microcrystalline wax.

Chlorinated Paraffin Wax

Upon chlorination of paraffinic wax we get Chlorinated Paraffin Wax(CPW). This is available in batch process that is processed from effective exothermic reaction. This reaction generates a by-product hydrochloric acid that is later removed out of the solution. Finally stabilizer and solution is mixed that provide the required final product, which is used in various industrial applications. With 30 to 70% chlorine and insolubility in water, these CPWs have low vapor pressure. Chlorinated Paraffin Wax is highly inert, insoluble in water and they have low vapor pressure. Generally used as plasticizers in plastic and elastomers, where flame retardant property is important.

Polyethylene waxes (PE-Wax)

Polyethylene waxes or PE-Wax is same familiar polyethylene chemical structure (Fig.5) but with lower molecular weight , generally around or less than 3000.This is a processing aid in elastomer and plastics but basically they are a form of synthetic resins. It is a white solid product (Fig.6) appears in the market as powdery, lumpy, or flaky product. It is a non-toxic product having concentrated distribution of molecular weight of 1500 with specific gravity about 0.94 with high softening point but low fusion viscosity with melting point; 112 - 118°C, melt peak 110 °C, flash point 210°C, minimum. It has excellent stability against polishing, scratch resistance, metal mark resistance, scuff resistance. PE-Wax is resistant to water and chemical materials.

Comments (0)

ADD COMMENT

Link Copied!

Birla Carbon is set to participate in the upcoming Tire Technology Expo 2026, scheduled to take place in Hannover, Germany, from 3 to 5 March 2026. Attendees can find the company at Stand C 224, where it will present its latest innovations in carbon black and sustainable materials. The focus will be on solutions specifically designed to meet the evolving demands of the tyre industry, particularly in enhancing performance while aligning with broader environmental objectives.

The exhibition will serve as a platform to demonstrate how Birla Carbon’s advanced materials contribute to greater tyre durability and fuel efficiency. These developments are especially pertinent for next-generation mobility, including the specific requirements of electric vehicles. The company aims to show tire manufacturers how performance enhancements can be achieved without sacrificing sustainability commitments.

A key theme of their presence will be the strength and agility of their supply network across the EMEA region. By emphasising its robust local manufacturing and distribution framework, Birla Carbon intends to highlight its role as a dependable innovation partner. This infrastructure is built to ensure consistent quality and supply chain resilience, allowing for effective collaboration even in fluctuating market conditions.

Sustainability will be woven throughout the company’s engagement at the expo. Birla Carbon plans to detail its journey towards achieving net zero carbon emissions, spotlighting advancements like its Continua Sustainable Carbonaceous Material (SCM). The widespread ISCC Plus certification across its global manufacturing sites will also be featured, underscoring its commitment to traceable and responsible sourcing practices throughout the value chain.

John Davidson, Chief Sales, Marketing & Sustainability Officer, Birla Carbon, said, “Birla Carbon brings a range of innovative carbon black solutions, backed by its decades of manufacturing leadership, at a time when the industry is focused on maximising tyre performance across diverse mobility requirements. As mobility evolves towards electric and more energy-efficient platforms, carbon black is increasingly becoming a key performance enabler, directly influencing durability, rolling resistance and lifecycle emissions. Tire Technology Expo provides an impactful global platform to demonstrate how our advanced carbon material solutions are engineered for modern mobility and sustainability.”

Comments (0)

ADD COMMENT

Link Copied!

Sri Trang Agro-Industry Public Company Limited (STA) is advancing Thailand’s agricultural digital transformation through its homegrown platform, the Sri Trang Friends application. Launched in 2019 with the vision of providing a comprehensive digital tool for rubber farmers, the platform has since evolved to serve a broader agricultural community, including palm growers. It is designed to streamline access to information, services and various support mechanisms, creating a direct link between the company, farmers and supply chain participants.

A key recent development is the introduction of the Friends Shop feature and the Friends Point rewards system. This enhancement integrates local merchants from communities nationwide into the application, allowing farmers to conduct convenient transactions while helping to lower their daily expenses. The points accumulated can be used as cash equivalents or exchanged for a wide range of benefits, including essential goods and services, thereby stimulating local economic activity. The platform’s utility has also been extended to Sri Trang Group employees and the general public, who can now earn and redeem points for discounts or payments at participating outlets such as supermarkets, fuel stations and coffee shops. This expansion ensures the app delivers practical, lifestyle-oriented advantages to a wider user base.

According to Executive Director Vitchaphol Sincharoenkul, the application was originally conceived under the concept of ‘One App, Complete Services for Rubber Farmers’ to strengthen farmer engagement, improve coordination efficiency and ensure fully traceable and transparent produce trading. Beyond these operational goals, it also opens new marketing channels for local communities and fosters deeper collaboration across the agricultural value chain. The company is actively broadening its network of partners to diversify the benefits and merchant options available to users.

Currently, the Sri Trang Friends platform has attracted over 150,000 registered users, with more than 40 community merchants across various regions either already onboard or preparing to join. This growth underscores the company’s commitment to leveraging a Thai-developed digital solution to empower modern farmers, reinforce local economies and drive sustainable long-term progress within the nation’s agricultural sector.

Comments (0)

ADD COMMENT

Link Copied!

Himadri Speciality Chemical Ltd (HSCL) has officially launched commercial production at its new 70,000 metric tonne per annum speciality carbon black line in Mahistikry, West Bengal. This brownfield expansion elevates the company’s total carbon black manufacturing capacity to 250,000 MTPA, with 130,000 MTPA specifically dedicated to speciality grades at this single location. As a result, the Mahistikry facility now holds the distinction of being the largest site in the world for speciality carbon black production.

The development represents a pivotal achievement in the company’s strategic roadmap, solidifying its global standing in the advanced materials sector. By significantly increasing its speciality portfolio, the company is better positioned to meet the rigorous demands of high-value industries such as plastics, inks, paints and coatings. The project integrates cutting-edge process technology with stringent quality controls and energy-efficient systems, ensuring that premium-grade products are consistently delivered to an international client base.

Financially, the new capacity is set to positively influence revenue streams and bolster margins over the coming years. The expanded scale not only enhances operational efficiency and supply chain dependability but also accelerates the company’s ability to innovate and respond to market shifts. As worldwide demand increasingly favours tailored, high-performance carbon solutions, this enhanced infrastructure provides a distinct competitive edge through improved agility and product development capabilities.

Anurag Choudhary, CMD & CEO, Himadri Speciality Chemical Ltd, said, “The commencement of commercial operations of our 70,000 MTPA Speciality Carbon Black line at Mahistikry marks the beginning of the next phase of growth in our advanced carbon materials journey. With this expansion, Mahistikry becomes the world’s largest single-location Speciality Carbon Black facility, with a capacity of 130,000 MTPA. This milestone significantly enhances our production capabilities and positions us strongly to capture rising global demand in premium, application-specific segments such as plastics, inks, paints, coatings and other specialised industries. We remain committed to disciplined expansion, operational excellence, sustainability and delivering high-performance solutions that create long-term value for all stakeholders.”

Comments (0)

ADD COMMENT

Link Copied!

Solvay has announced that it will optimise the soda ash production capacity at its Torrelavega site in Spain from 600 kilotonnes to 420 kilotonnes, effective from the third quarter of 2026 and pending the required consultation process. This decision is a direct response to ongoing global oversupply and persistently high energy and carbon costs in Europe.

By optimising its operational level, the company aims to strengthen the long-term competitiveness and sustainability of its remaining production at the facility. The Torrelavega site will continue to serve regional customers by focusing on soda ash and premium sodium bicarbonate, with supply guaranteed through both local operations and Solvay’s global network. Importantly, sodium bicarbonate production will remain unaffected.

This adjustment also supports the company’s commitment to the energy transition, including a major biomass initiative designed to significantly reduce coal usage at the site. As a result of the capacity reduction, a net decrease of up to 77 positions is expected. Solvay is committed to managing this transition responsibly and will engage closely with employee representatives to develop socially supportive solutions and measures for those impacted.

Etienne Galan, President of Solvay Soda Ash & Derivatives, said, “Solvay is taking decisive steps to enhance the competitiveness and sustainability of its soda ash operations. Soda ash is critical for essential applications, and Solvay remains firmly committed to the business. We are strategically investing now to cement our competitiveness for decades to come, including the deployment of carbon neutral soda ash processes as part of our energy transition roadmap. At the same time, we urgently need the regulatory framework to align with our industrial reality and the investments that are needed for this transformation.”

Comments (0)

ADD COMMENT

Link Copied!