Silicone Resins: Heat resistant coatings

Fig 01: Heat resistant coatings used in infrastructure (the metallic paint)

Heat resistant coatings are used frequently in industrial coating applications that can protect the substrate at high temperatures (more than 180 °C). As a result, these are the primary choice of coatings to protect ovens, kettles, pipelines, exhausts, heat exchangers, chimneys, auto engines and stoves.

Silicone Resin

Standard heat-resistant paint formulations can tolerate heat only up to 150-200 °C and frequently use a variety of organic resins as binders, including epoxy, polyester, alkyd and acrylic. Such paint formulations must include silicone resins as an essential ingredient in order to boost their capability for heat resistance.
Silicone resins have numerous important feature besides heat resistance, such as great weather ability, superior dielectric and water repellency capabilities. This improves durability and the reliability of the coatings.

Silicone resin reaction process: The polycondensation type reaction.

Silicone resins can be produced by hydrolyzing mixtures of chlorosilanes or alkoxy silanes to form highly reactive silanol groups:

Reactive silanol initially condense to form oligomer siloxane structures:

Further condensation occurs to form three-dimensional siloxane lattices. Driving the condensation by applying heat and catalysts increases the molecular weight and improves physical properties.

The most significant monomer in silicone resin technology by volume is methyl-trichlorosilane.  Silicone resins are often produced by combining multiple raw materials to incorporate multiple functional groups. Methyl silicone resins (R=methyl) have a high degree of hardness and cure quickly, but also exhibit brittleness, poor pigmentability, and poor compatibility with organic resins.The phenyl silicone (R=phenyl) based resins have great thermal stability, good pigmentability, and increased compatibility with organic resins, but it also produces products that are much more cross-linked and have lower thermoplasticity than those having methyl groups. A majority of silicone resins are of a mixed methyl phenyl type. The performance of the product can be determined by the methyl to phenyl molar ratio.

Types of silicone resins:

Methyl silicone resin:

A type of silicone resin having a completely methyl-based organic substituent group that produces hard films with high moisture resistance, dielectric characteristics, water repellency, dirt repellancy, UV resistance and releasing qualities. Coating made of this alone can resist temparatures of 400 C.

Methyl/Phenyl silicone resin:

The organic substituent group in these resins, which consists of methyl and phenyl groups, gives them great heat resistance, mechanical strength, water/UV resistant, and gloss. Heat resist up-to 650 °C

Organic resin modified silicone resin:

The silanol functionality can be reacted with hydroxyl groups on organic resins (e.g., polyesters, epoxy, alkyds, etc.) to form silicone-organic hybrid resins with performance improvements proportionate to the level of siloxane modification. They form a coating with the advantages of organic resins (such as mechanical properties, curing profile, economy and adhesion)
While silicone resins can enhance the paint’s thermal, chemical, and UV radiation resistance, a combination of silicone and organic binders will also improve several performance characteristics and physical features like making air dry acrylics, higher corrosion resistant epoxies and tougher alkyds.

Thermal properties of silicone resin:

The thermal behaviour of the silicone resin was analysed by thermo gravimetric analysis at a heating rate of 10°C/min from room temperature to 800°C under an air. In the examples below,

  • Sample A : 100% Methyl silicone resin compound.
  • Sample B : 50% Methyl 50% phenyl silicone resin compound.
  • Sample C : High MW 25% Methyl 75% phenyl silicone resin in solvent.

Thermal degradation behaviour of all samples in air were summarized in Table 1.

Table 01: Thermal degradation data by TGA analysis.

T10% represented the temperature at which the mass loss was 10 wt% of the system. Tmax represented the temperature of the maximum mass loss rate of the system.
The Td (temperature degradation) increased as the silicone resin’s phenyl content increased due to the silicone resin’s rising molecular weight. This could have prevented the -Si-O and -Si-Me groups from breaking down.
The temperatures of the maximum degradation rate (MRD) of silicone resin containing phenyl (Sample B & C) were lower than those of the silicone resin without phenyl (Sample A). This indicated that the thermal decomposition rate of the silicone resin slowed down with the addition of the content of the phenyl group moiety.

Silicone resin : Binders for heat resistant paint

For many years coatings based on methyl/phenyl silicone resins have proven to be one of the most effective and reliable products within the high heat and protective coatings segments. Fillers inorganic characters along with the methyl/phenyl modification provide outstanding long term thermal stability, attractive corrosion protection, weather resistance and good mechanical properties. In general, silicone resins for high heat applications can be categorized into two sub-groups: i) Heat curing and ii) Air curing systems.
Metal alkoxide catalysts were utilized in the moisture-curable air cure system to induce crosslinking. The silicone resin’s hydroxyl groups and moisture in the environment can react with the catalyst to crosslink the polymer.
The methyl silicone resin has a tremendous potential for heat resistance up to 400 °C, however methyl phenyl silicone resin performs better at higher temperatures up to 650 °C. Based on the formulas, modified polyester silicone resin and epoxy silicone resin can withstand heat up to 350-550 °C.

Summarized data of silver heat resistant paint having silicone resin used as binders.

Table 02: silver heat resistant paint test data

Fig: 02 Sample A – Methyl silicone resin metallic paint formulation – quenching at 450°C pass other 500°C and 600°C failed

Fig 03 Sample B – Methyl phenyl silicone resin metallic paint formulation– quenching at 450°C/500°C/600°C pass

Fig 04 Sample C – High phenyl silicone resin metallic paint formulation – quenching at 450°C /500°C /600°C pass

In conclusion, the TGA and metallic paint testing results demonstrated that changing the methyl and phenyl ratio of silicone resin improves the thermal stability. The UV resistance and corrosion resistance are extremely good of heat resistant coating. The silicone resin’s outstanding durability and substrate adhesion are demonstrated by the adhesion test that done after the quenching test. These resins are excellent for many various types of protective coatings.

—- Elkay Chemicals Pvt. Ltd. India.

This blog is the copyright of Elkay Chemicals Private Limited. All content, including text and images, is owned by Elkay Chemicals Pvt. Ltd. and may not be reproduced or distributed without the express written permission of Elkay Chemicals Pvt. Ltd.

Silicone-Based Hair Serum

Silicone-Based Hair Serum

Unlocking the Secrets to Silky, Shiny Hair

Silicones is an essential part of the haircare regime:

Silicone is a versatile ingredient that has gained popularity in the world of cosmetics. It is widely used in various skincare, haircare, and makeup products due to its unique properties. This broad variety of compounds confers qualities including good spreading, film formation, wash-off resistance, skin feel, volatility, and permeability, which have an impact on the performance of practically every type of cosmetic product.

When it comes to hair care, we’re always on the lookout for products that can transform our tresses and give us that enviable, salon-worthy look. One such product that has gained popularity in recent years is silicone-based hair serum. This versatile hair care product has become a staple for many, thanks to its ability to deliver smooth, shiny, and frizz-free locks. In this blog, we will dive into the world of silicone-based hair serums, exploring what they are, how they work, and the benefits they offer.

Silicones in hair serums:

These serums are typically formulated with silicone derivatives, such as dimethicone or cyclomethicone, which are lightweight, clear, and non-greasy substances. Dimethicone is coated on individual hair and prevents the clumping of hairs. Silicone itself is a synthetic compound that forms a protective coating over the hair shaft, helping to seal in moisture and protect against external damage. This unique property makes silicone an excellent ingredient for hair serums, as it provides a multitude of benefits.

Making your hair look healthier:

One of the primary advantages of silicone-based hair serums is their ability to create a smooth, sleek appearance by coating the hair strands. This coating helps to reduce friction and prevent tangling and breakage, making it easier to comb or brush through the hair. Moreover, the silicone coating fills in any gaps in the hair cuticle, resulting in a more uniform surface and enhanced light reflection, which leads to a lustrous, shiny finish. This silicone coating is easily removed by shampoo wash. We have analyzed the scanning electron microscopy (SEM) of control hair and silicone hair serum-coated hair, denoted in Fig. 1.

Fig. 1. SEM images of silicone coated hair serum

Frizz control is another area where silicone-based hair serums excel. The silicone coating helps to seal the hair shaft, preventing moisture from entering or leaving the hair. This not only reduces frizz but also provides a protective barrier against humidity, which is often the main culprit behind frizzy hair. By taming frizz and flyaways, silicone-based serums can help achieve a polished, sleek hairstyle that lasts throughout the day. In addition to their smoothing and frizz-controlling properties, silicone-based hair serums can also offer heat protection. These serums create a barrier between the hair and heat-styling tools like straighteners or curling irons, reducing the damage caused by high temperatures. This is especially beneficial for those who frequently use heat styling tools, as the silicone coating helps to minimize moisture loss and protect the hair from becoming brittle and prone to breakage.

Finding the right balance:

While silicones provide numerous benefits, using too much product or applying it to the scalp can lead to a heavy, greasy feeling. It’s best to start with a small amount and distribute it evenly through the mid-lengths and ends of the hair, where it is most needed. Additionally, regular shampooing is necessary to prevent product buildup and ensure that the hair remains clean and healthy.

While silicone-based hair serums offer many advantages, it’s important to note that they are not a cure-all for all hair concerns. If you have specific hair issues like extreme damage or scalp conditions, it’s advisable to consult with a professional hairstylist or trichologist who can provide tailored advice and recommend appropriate treatments.

In conclusion, silicone-based hair serums have become a go-to product for achieving silky, shiny hair. Their ability to smooth, control frizz, and provide heat protection makes them a valuable addition to any hair care routine. By understanding how these serums work and using them appropriately, you can unlock the secrets to beautiful, healthy-looking locks. So why not give silicone-based hair serums a try and experience the transformative power they can have on your hair?

—- Elkay Chemicals Pvt. Ltd. India.

This blog is the copyright of Elkay Chemicals Private Limited. All content, including text and images, is owned by Elkay Chemicals Pvt. Ltd. and may not be reproduced or distributed without the express written permission of Elkay Chemicals Pvt. Ltd.

Restoring Kothrud Nallah: A Greener Future Begins! ?✨

Joining hands with Rotary Club Kothrud, Rotary District 3131, and Pune Municipal Corp (PMC), Elkay Chemicals proudly announces the Kothrud Nallah Rejuvenation Project.
Together, we’re revitalizing this natural gem on Environment day, promoting sustainability and creating a thriving ecosystem. ??

 Environment Day Plantation drive

Environment Day Plantation drive Environment Day Environment Day


Silicone chemicals in cosmetics applications and their implications to the environment, health and sustainability

Silicone chemicals exhibit unique surface as well as bulk properties that make them highly desirable for cosmetic applications. These include chemical inertness, biocompatibility, lubricity, comfort feel, slippery feel, compatibility with various formulations, hydrophobicity, hydrophilicity, broad synthetic molecular design options, and unique ability to combine several properties into one single molecule. These properties are possible due to unique molecular characteristics such as low surface energy, flexible bonds, high bond energy; high thermally stability. In recent times, these characteristics are becoming more relevant when viewed from the standpoint of environmental compatibility and overall sustainability.


Elkay Silicones Participated in CPHI India 2022

ELKAY participated in CPhi India 2022 held in Delhi from November 29th through December 1st 2022. It was great interacting with all the attendees and sharing the latest developments in our pharmaceutical and personal care product portfolio. In addition to our simethicone and dimethicone products, we have developed new products in the hair care and cosmetic additives segment .

Thank you to the more than 200 customers and suppliers for visiting us! We look forward to connecting with you soon.

Elkay Silicones, a proud recipient of FICCI National “Excellence in Exports Award” 2022

Federation of Indian Chamber of commerce and Industry (FICCI), New Delhi, India, conducted 10th national ‘Chemical and Petrochemical award, 2022’ function to recognize Companies for their contribution towards the development of various sectors.

Elkay Chemicals Pvt. Ltd., Pune, India was recognized with a prestigious award in the category of  ‘Excellence in Export’.

This award represents the Elkay’s contribution towards increasing India’s share in the global export market and also global presence of Elkay Chemicals. Currently supplying Silicone based Speciality Chemicals and formulations to more than 32 Countries Globally.

The award distribution ceremony took place at New Delhi and India Chem Expo on 2nd  Nov 2022. Mr. Bhaganth Khuba (Union minister for chemical and fertilizer) was the chief guest for the award ceremony.

Guhagar Beach Cleaning Campaign: Maharashtra

“Swatcha Bharat Abhiyan“
“Guhagar” Beach Cleaning Campaign: Maharashtra

Elkay chemicals P. Ltd., Lote, Dist. Ratnagiri, MH -hosted & participated in beach cleaning campaign. It was organized by Ghuhagar Panchayat Samiti, Dist. Ratnagiri.

Celebrating “Azadi ka Amrut Mohotsav” ( 75 th year of Independent India ) on 20 Aug 2022, more than 120 volunteers participated in this beach

cleaning campaign including Elkay team, Guhagar Panchayat Samiti staff, women self-help group, school students and staff etc.

They cleaned stretch of 2 km beach of all plastic, flowers etc.

Thank you all volunteers for your participation in this important social activity and Swatcha Bharat Abhigyan !



Elkay Silicones participation in Silicone Expo 2022, Detroit, USA

Elkay Silicones participated in Silicone Expo 2022, Detroit USA, which is the first commercial trade show and conference for silicone industry. 180+ global exhibitors from manufacturing and supply chain industry participated in this trade show.

In Silicone Expo 2022, Elkay Silicones showed its entire new range of products like Elastomers, Resins, Gels for various industrial applications.

The show had conference on “Sustainability”. Dr. Rahul Kulkarni, VP Technical was one of the panel members explaining how Elkay has innovated processes to find sustainable solutions for silicone industry for betterment of society. We thank everyone who visited at our stall.




Dr. Ravindra Kulkarni has been elected for the distinction of “Fellow of National Academy of Engineers”, USA.

We are very happy to announce and congratulate Dr. Ravindra D. Kulkarni for his inclusion into the United States National Academy of Engineering (NAE). This honour is amongst the highest professional distinctions accorded to an engineer. Membership to the NAE honours those who have made outstanding contributions to engineering research, practice, or education and to the pioneering of new and developing fields of technology and making major advancements in traditional fields of engineering.

Dr. Kulkarni is being recognized for innovation centric business and technology development and leadership across many disciplines. While the first half of his career was of evolving into a successful scientist with numerous patents and recognitions in diverse fields such as silicones, solid state chemistry and surface science developments in computer hardware, he shifted his focus in the next part of his career to becoming an entrepreneur and industrialist.


Elkay Chemicals distributed tablet computers to needy students of Chandrakant Darode School, Pune

ELKAY Chemicals Pvt. Ltd, Pune distributed 50 tablet computers to the Chandrakant Darode School, Shivaji Nagar, Pune as part of its Corporate Social Responsibility activities in coordination with the Rotary Club of Pune (Kothrud).

The school management thanked and appreciated Elkay’s philosophy of caring & empowering needy students. The event was attended by Mr. Jaideep Sharma & Mr. Pramod Barange from ELKAY and President S. Chitale & General Secretary Gayatri on behalf of Rotary Club.

These tablet computers come pre-installed with the school syllabus from 1st to 10th standard and some additional visual and 3D demonstrations. This will enable students  to study and complete their course work remotely.