Graphite and Carbon Sealing Gasket Sales

Graphite and Carbon Sealing Gasket Sales Market Outlook

The global graphite and carbon sealing gasket sales market is projected to reach approximately USD 1.8 billion by 2035, growing at a compound annual growth rate (CAGR) of around 5.5% from 2025 to 2035. This growth is driven by the increasing demand for sealing solutions across various end-use industries, particularly in applications that require high-temperature and high-pressure resistance. The automotive sector, along with oil and gas industries, has been a significant contributor to the increasing sales in this market. Moreover, the rise in industrial automation and the need for efficient manufacturing processes further boost the demand for advanced sealing technologies. Additionally, growing environmental regulations are pushing industries to adopt high-performance materials that can ensure safety and efficiency, thereby fueling the market's expansion.

Growth Factor of the Market

The graphite and carbon sealing gasket market is experiencing robust growth due to several key factors. First and foremost, the escalating demand for durable and high-performance sealing solutions in various industries has led to an increase in production and innovation. This is particularly evident in sectors such as automotive and aerospace, where reliability and safety are paramount. Additionally, the ongoing shift toward greener technologies and materials is prompting manufacturers to invest in research and development, ultimately enhancing product offerings. The expansion of industries in emerging economies, coupled with urbanization and industrialization, is further fueling demand for sealing solutions. Moreover, advancements in manufacturing technologies are enabling the production of sealing gaskets that are not only cost-effective but also tailored to meet specific application requirements. This combination of factors is expected to propel the market toward sustained growth in the coming years.

Key Highlights of the Market

• The global market is expected to register a CAGR of 5.5% from 2025 to 2035.
• Significant demand from the automotive and aerospace sectors is driving market growth.
• Innovations in material technology are enhancing durability and performance.
• The rise of eco-friendly sealing solutions is shaping market trends.
• Emerging economies are witnessing rapid industrial growth, boosting demand.

By Product Type

Graphite Sealing Gaskets:

Graphite sealing gaskets are widely recognized for their excellent thermal resistance and chemical stability, making them essential in various industrial applications. These gaskets can withstand high temperatures while maintaining their structural integrity, which is crucial in environments where heat and pressure fluctuate. Their exceptional compressibility and recovery properties allow for effective sealing, reducing the likelihood of leaks. As industries increasingly prioritize safety and efficiency, the demand for graphite sealing gaskets continues to rise. They are particularly favored in applications like oil and gas, where reliability is paramount, ensuring that systems operate without the risk of contamination or loss of pressure.

Carbon Sealing Gaskets:

Carbon sealing gaskets are gaining traction due to their unique properties that make them suitable for high-performance applications. These gaskets exhibit high strength and resilience, which is vital in environments that experience extreme conditions. Carbon sealing gaskets are utilized in various sectors, including automotive and industrial machinery, where they perform effectively under high pressures and temperatures. The growing focus on reducing equipment failures and maintenance costs has further propelled the adoption of carbon sealing gaskets, as they can significantly enhance the lifespan of machinery by preventing leaks and ensuring operational efficiency.

Flexible Graphite Sealing Gaskets:

Flexible graphite sealing gaskets are distinct for their ability to conform to irregular surfaces, thereby providing a superior seal in challenging environments. This flexibility allows these gaskets to be used in a variety of applications, from automotive engines to industrial equipment. Their resistance to thermal expansion and contraction makes them ideal for high-temperature applications, ensuring consistent performance. As industries continue to evolve and demand more versatile sealing solutions, the popularity of flexible graphite gaskets is expected to grow, driven by their effectiveness and adaptability in diverse operational conditions.

Expanded Graphite Sealing Gaskets:

Expanded graphite sealing gaskets offer unique advantages, particularly in applications requiring enhanced sealing capabilities. They are produced from natural graphite, which is expanded and processed to create a highly compressible material. This feature allows expanded graphite gaskets to fill gaps effectively, preventing leaks and improving overall system efficiency. Their excellent thermal and chemical resistance makes them suitable for use in harsh environments, such as chemical processing and oil refineries. As more industries recognize the benefits of expanded graphite sealing gaskets, this product segment is anticipated to witness substantial growth in the coming years.

Carbon Fiber Sealing Gaskets:

Carbon fiber sealing gaskets are known for their lightweight yet robust structure, making them ideal for applications in aerospace and high-performance automotive sectors. The use of carbon fiber enhances the gasket's strength while minimizing weight, which is critical in industries where weight reduction is linked to performance improvement. These gaskets provide exceptional mechanical properties, allowing them to withstand extreme conditions without compromising reliability. The growing emphasis on fuel efficiency and performance optimization in the automotive industry is expected to drive the demand for carbon fiber sealing gaskets, making them a crucial component in modern engineering.

By Application

Automotive:

The automotive sector represents a significant segment of the graphite and carbon sealing gasket market due to the increasing demand for reliable and high-performance sealing solutions in vehicles. With the rise in production of advanced vehicles, including electric and hybrid models, there is a growing need for gaskets that can withstand varying temperatures and pressures encountered during operation. The automotive industry's focus on reducing emissions and improving fuel efficiency further drives the demand for innovative sealing technologies, as effective gaskets play a critical role in maintaining engine performance and longevity.

Industrial:

The industrial application of graphite and carbon sealing gaskets encompasses a wide range of sectors, including manufacturing, power generation, and chemical processing. In these industries, sealing solutions are essential for maintaining operational efficiency and preventing leaks that could lead to hazardous situations. The increasing focus on safety and regulatory compliance in industrial operations is driving the demand for high-quality sealing gaskets that can withstand extreme conditions. As industries continue to grow and evolve, the need for reliable sealing solutions will remain a key driver of market growth in the industrial segment.

Aerospace:

The aerospace industry requires sealing solutions that can perform under the most demanding conditions, making graphite and carbon sealing gaskets essential components in aircraft manufacturing and maintenance. These gaskets must provide exceptional sealing capabilities while being lightweight to enhance overall aircraft efficiency. The stringent regulations and safety standards in the aerospace sector necessitate the use of high-performance materials that can withstand extreme temperatures and pressures during flight. As air travel continues to increase, the demand for advanced sealing technologies in aerospace applications is poised to rise, contributing to market expansion.

Oil & Gas:

The oil and gas industry is one of the largest consumers of graphite and carbon sealing gaskets due to the need for reliable sealing solutions in harsh environments. Sealing gaskets are critical in drilling, extraction, and transportation processes, where leaks can result in significant operational disruptions and environmental hazards. The growing focus on safety and the push for more efficient extraction methods are driving the demand for high-performance sealing gaskets. As the industry continues to expand, especially with the discovery of new reserves, the need for effective sealing solutions will remain a key growth driver in this segment.

Electronics:

In the electronics sector, graphite and carbon sealing gaskets are used in a variety of applications, including electrical connectors and housings. These gaskets provide essential sealing capabilities that protect sensitive electronic components from dust, moisture, and other contaminants. As technology advances and electronic devices become more complex, the need for reliable sealing solutions increases. Furthermore, the growing trend of miniaturization in electronics necessitates the development of smaller yet effective sealing gaskets, contributing to the overall growth of the market within this application segment.

By Distribution Channel

Direct Sales:

Direct sales channels play a crucial role in the graphite and carbon sealing gasket market, allowing manufacturers to engage directly with end-users. This approach facilitates a better understanding of customer needs, enabling companies to provide tailored solutions that meet specific requirements. Direct sales also allow for quicker feedback and improved customer service, enhancing overall satisfaction and loyalty. Manufacturers leveraging direct sales can establish stronger relationships with their clients, contributing to increased market share and driving growth within the industry.

Distributors:

Distributors serve as important intermediaries in the graphite and carbon sealing gasket market, providing a vast network that enhances product accessibility. By partnering with distributors, manufacturers can reach a broader audience and penetrate new markets more effectively. Distributors often have established relationships with various industries, enabling them to promote sealing solutions to potential customers. This segment of the distribution channel is expected to grow as manufacturers continue to seek efficient ways to expand their market presence and improve product availability.

E-commerce:

The rise of e-commerce has transformed the way consumers purchase graphite and carbon sealing gaskets, providing a convenient and efficient platform for procurement. Online marketplaces enable customers to compare products, read reviews, and make informed purchasing decisions from the comfort of their homes or offices. The growing trend of digitalization in various industries has also shifted purchasing behavior toward e-commerce platforms, which offer a wide range of options and the ability to source products from different manufacturers. As e-commerce continues to gain traction, this distribution channel is expected to play a significant role in driving market growth.

Retail Stores:

Retail stores remain a vital distribution channel for graphite and carbon sealing gaskets, especially for smaller businesses and DIY enthusiasts. Physical stores offer the advantage of immediate product availability and the ability for customers to inspect products before making a purchase. Additionally, knowledgeable staff can provide valuable advice and recommendations, enhancing the customer experience. While e-commerce is on the rise, retail stores continue to cater to a segment of the market that prefers traditional shopping methods, and their role in the market is expected to persist.

Others:

This category encompasses various unconventional distribution methods, including trade shows, exhibitions, and specialized contractors who may sell sealing gaskets in niche markets. These channels can serve specific customer segments that may not be reached through traditional distribution methods. The ongoing innovation in marketing and distribution strategies allows companies to explore potential opportunities in these alternative channels. As competition intensifies, manufacturers may increasingly seek to diversify their distribution channels to capture a wider customer base and boost sales.

By Material Type

Natural Graphite:

Natural graphite is a key material used in the production of sealing gaskets due to its excellent thermal and chemical resistance properties. Gaskets made from natural graphite can withstand extreme temperatures and pressures, making them suitable for applications in industries such as oil and gas, automotive, and aerospace. As sustainability becomes a growing concern, natural graphite is favored over synthetic alternatives due to its eco-friendly nature. The demand for natural graphite sealing gaskets is expected to rise as industries increasingly prioritize environmentally sustainable materials.

Synthetic Graphite:

Synthetic graphite is gaining traction in the sealing gasket market due to its ability to be engineered for specific performance characteristics. This material can be tailored to provide enhanced sealing capabilities in high-stress environments, making it particularly valuable in industries that require precision and reliability. The versatility of synthetic graphite allows manufacturers to create gaskets that perform optimally in various applications, contributing to increased demand. As technology advances, the adoption of synthetic graphite in sealing solutions is anticipated to grow.

Carbon Fiber:

Carbon fiber is known for its lightweight and high-strength properties, making it an ideal choice for sealing gaskets used in high-performance applications. The aerospace and automotive industries, in particular, benefit from carbon fiber sealing gaskets, as they contribute to weight reduction while maintaining structural integrity. The growing emphasis on fuel efficiency and performance enhancement in these sectors is driving the demand for carbon fiber gaskets. As manufacturers continue to innovate, the integration of carbon fiber in sealing solutions is expected to increase significantly.

Carbon Black:

Carbon black is often utilized as a reinforcing agent in sealing gaskets, enhancing their mechanical properties and durability. The addition of carbon black improves the overall performance of gaskets by providing resistance to compression and wear, making them suitable for various industrial applications. As industries prioritize longevity and reliability in their sealing solutions, the demand for carbon black-enhanced gaskets is expected to rise. Furthermore, the growing trend towards sustainable practices may lead to innovations in carbon black formulations, driving further growth in this material segment.

Other Carbon Materials:

This category includes a variety of other carbon-based materials used in the production of sealing gaskets. These materials may encompass composites and blends designed to enhance specific properties such as thermal resistance, chemical stability, or flexibility. The versatility of these materials allows manufacturers to develop customized sealing solutions tailored to the unique requirements of different applications. As industries evolve and seek specialized sealing solutions, the demand for other carbon materials is expected to grow, contributing to the overall expansion of the market.

By Region

In the North America region, the graphite and carbon sealing gasket market is projected to grow significantly, capturing a market share of approximately 30% by 2035. The presence of established automotive and aerospace industries, coupled with a strong focus on technological advancements, will drive the demand for high-performance sealing solutions. Factors such as stringent regulatory standards and an increasing emphasis on safety and efficiency in manufacturing processes further bolster the market's growth prospects. Additionally, the region is anticipated to witness a CAGR of around 5.2% during the forecast period, reflecting the ongoing innovation and investment in advanced sealing technologies.

Europe is also expected to emerge as a key player in the graphite and carbon sealing gasket market, holding a substantial market share of around 25% by 2035. The automotive sector, along with industrial applications, will continue to propel demand as manufacturers seek reliable sealing solutions that enhance efficiency and reduce operational costs. The region's commitment to sustainable practices and the adoption of eco-friendly materials will further support the growth of the market. With ongoing advancements in manufacturing processes and materials, Europe is set to experience steady growth, contributing significantly to the global market landscape.

Opportunities

The graphite and carbon sealing gasket market presents numerous opportunities for growth and innovation in the coming years. One of the primary opportunities lies in the increasing demand for eco-friendly and sustainable materials. As industries become more environmentally conscious, there is a significant shift toward materials that minimize ecological impact, leading to the development of advanced sealing solutions that align with these values. Manufacturers can capitalize on this trend by investing in research and development to create sealing gaskets made from renewable resources or that utilize recycling processes to reduce waste. This focus on sustainability not only meets regulatory demands but also appeals to a growing consumer base that prioritizes environmental responsibility.

Another promising opportunity in the market is the advancement of technology in sealing solutions. As industries adopt smart manufacturing and automation, there is a growing need for sealing gaskets that can integrate seamlessly with digital systems. Innovations such as smart gaskets equipped with sensors could provide real-time monitoring of sealing integrity, detecting issues before they escalate into significant problems. This technological integration will enhance operational efficiency and reduce downtime, making it an attractive proposition for manufacturers. Companies that invest in developing smart sealing solutions are likely to find new avenues for growth and differentiation in an increasingly competitive market.

Threats

The graphite and carbon sealing gasket market faces several threats that could impede growth and profitability. One of the primary concerns is the fluctuating prices of raw materials, which can significantly impact production costs and pricing strategies. As industries become more globalized, supply chain disruptions due to geopolitical tensions, natural disasters, or trade policies may also threaten the availability of essential materials. Manufacturers must navigate these uncertainties while maintaining competitive pricing and ensuring consistent quality. Additionally, the emergence of alternative sealing solutions, such as advanced polymers and composites, poses a challenge to the market, as these materials may offer similar or superior performance at potentially lower costs.

Moreover, stringent regulations and standards within various industries can act as a restraining factor for market growth. Compliance with these regulations often requires substantial investment in research, development, and certification processes, impacting the ability of smaller manufacturers to compete effectively. As industries evolve, companies must continuously adapt to new regulations and product standards to remain compliant, which can divert resources from innovation and growth initiatives. The combined effect of these threats necessitates strategic planning and resilience from manufacturers to navigate the complexities of the market landscape.

Competitor Outlook

• Gasket Group
• Frenzelit GmbH
• Flexitallic
• Garlock Sealing Technologies
• Sealing Devices Inc.
• EagleBurgmann
• John Crane
• Teadit Group
• ElringKlinger AG
• Hennig Gasket & Seals, Inc.
• Saint-Gobain Seals
• Graphite Metallizing Corporation
• James Walker
• Rheem Manufacturing Company
• Lambda Gasket

The competitive landscape of the graphite and carbon sealing gasket market is characterized by the presence of several key players, each vying to capture market share through innovation, quality, and customer service. Major companies like Garlock Sealing Technologies and John Crane have established themselves as industry leaders by consistently delivering high-quality sealing solutions tailored to specific applications. These companies invest heavily in research and development to enhance their product offerings, focusing on durability, performance, and sustainability. Additionally, the expansion of these companies into emerging markets enables them to tap into new customer bases, driving overall growth in the industry.

Another significant aspect of the competitive landscape is the trend of partnerships and collaborations among manufacturers. Companies are increasingly joining forces to leverage each other’s strengths, whether through technological sharing, joint ventures, or co-development initiatives. For instance, partnerships between gasket manufacturers and material suppliers can lead to the creation of innovative sealing solutions that meet the evolving needs of industries. Such collaborations not only enhance product offerings but also improve market reach and competitiveness.

Furthermore, the emphasis on sustainability and eco-friendly practices is shaping the competitive dynamics of the market. Companies that prioritize the development of environmentally responsible sealing solutions are likely to gain favor among consumers and industries focused on sustainability. Firms like Teadit Group and Frenzelit GmbH are already making strides in this area, developing products that align with green initiatives. As regulatory pressures increase regarding environmental impact, manufacturers that position themselves as leaders in sustainable practices will have a competitive advantage in capturing market share.

• 1 Appendix

  • 1.1 List of Tables
  • 1.2 List of Figures

• 2 Introduction

  • 2.1 Market Definition
  • 2.2 Scope of the Report
  • 2.3 Study Assumptions
  • 2.4 Base Currency & Forecast Periods

• 3 Market Dynamics

  • 3.1 Market Growth Factors
  • 3.2 Economic & Global Events
  • 3.3 Innovation Trends
  • 3.4 Supply Chain Analysis

• 4 Consumer Behavior

  • 4.1 Market Trends
  • 4.2 Pricing Analysis
  • 4.3 Buyer Insights

• 5 Key Player Profiles

  • 5.1 John Crane
    • 5.1.1 Business Overview
    • 5.1.2 Products & Services
    • 5.1.3 Financials
    • 5.1.4 Recent Developments
    • 5.1.5 SWOT Analysis
  • 5.2 Flexitallic
    • 5.2.1 Business Overview
    • 5.2.2 Products & Services
    • 5.2.3 Financials
    • 5.2.4 Recent Developments
    • 5.2.5 SWOT Analysis
  • 5.3 Gasket Group
    • 5.3.1 Business Overview
    • 5.3.2 Products & Services
    • 5.3.3 Financials
    • 5.3.4 Recent Developments
    • 5.3.5 SWOT Analysis
  • 5.4 James Walker
    • 5.4.1 Business Overview
    • 5.4.2 Products & Services
    • 5.4.3 Financials
    • 5.4.4 Recent Developments
    • 5.4.5 SWOT Analysis
  • 5.5 Teadit Group
    • 5.5.1 Business Overview
    • 5.5.2 Products & Services
    • 5.5.3 Financials
    • 5.5.4 Recent Developments
    • 5.5.5 SWOT Analysis
  • 5.6 EagleBurgmann
    • 5.6.1 Business Overview
    • 5.6.2 Products & Services
    • 5.6.3 Financials
    • 5.6.4 Recent Developments
    • 5.6.5 SWOT Analysis
  • 5.7 Lambda Gasket
    • 5.7.1 Business Overview
    • 5.7.2 Products & Services
    • 5.7.3 Financials
    • 5.7.4 Recent Developments
    • 5.7.5 SWOT Analysis
  • 5.8 Frenzelit GmbH
    • 5.8.1 Business Overview
    • 5.8.2 Products & Services
    • 5.8.3 Financials
    • 5.8.4 Recent Developments
    • 5.8.5 SWOT Analysis
  • 5.9 ElringKlinger AG
    • 5.9.1 Business Overview
    • 5.9.2 Products & Services
    • 5.9.3 Financials
    • 5.9.4 Recent Developments
    • 5.9.5 SWOT Analysis
  • 5.10 Saint-Gobain Seals
    • 5.10.1 Business Overview
    • 5.10.2 Products & Services
    • 5.10.3 Financials
    • 5.10.4 Recent Developments
    • 5.10.5 SWOT Analysis
  • 5.11 Sealing Devices Inc.
    • 5.11.1 Business Overview
    • 5.11.2 Products & Services
    • 5.11.3 Financials
    • 5.11.4 Recent Developments
    • 5.11.5 SWOT Analysis
  • 5.12 Hennig Gasket & Seals, Inc.
    • 5.12.1 Business Overview
    • 5.12.2 Products & Services
    • 5.12.3 Financials
    • 5.12.4 Recent Developments
    • 5.12.5 SWOT Analysis
  • 5.13 Rheem Manufacturing Company
    • 5.13.1 Business Overview
    • 5.13.2 Products & Services
    • 5.13.3 Financials
    • 5.13.4 Recent Developments
    • 5.13.5 SWOT Analysis
  • 5.14 Garlock Sealing Technologies
    • 5.14.1 Business Overview
    • 5.14.2 Products & Services
    • 5.14.3 Financials
    • 5.14.4 Recent Developments
    • 5.14.5 SWOT Analysis
  • 5.15 Graphite Metallizing Corporation
    • 5.15.1 Business Overview
    • 5.15.2 Products & Services
    • 5.15.3 Financials
    • 5.15.4 Recent Developments
    • 5.15.5 SWOT Analysis

• 6 Market Segmentation

  • 6.1 Graphite and Carbon Sealing Gasket Sales Market, By Application
    • 6.1.1 Automotive
    • 6.1.2 Industrial
    • 6.1.3 Aerospace
    • 6.1.4 Oil & Gas
    • 6.1.5 Electronics
  • 6.2 Graphite and Carbon Sealing Gasket Sales Market, By Product Type
    • 6.2.1 Graphite Sealing Gaskets
    • 6.2.2 Carbon Sealing Gaskets
    • 6.2.3 Flexible Graphite Sealing Gaskets
    • 6.2.4 Expanded Graphite Sealing Gaskets
    • 6.2.5 Carbon Fiber Sealing Gaskets
  • 6.3 Graphite and Carbon Sealing Gasket Sales Market, By Material Type
    • 6.3.1 Natural Graphite
    • 6.3.2 Synthetic Graphite
    • 6.3.3 Carbon Fiber
    • 6.3.4 Carbon Black
    • 6.3.5 Other Carbon Materials
  • 6.4 Graphite and Carbon Sealing Gasket Sales Market, By Distribution Channel
    • 6.4.1 Direct Sales
    • 6.4.2 Distributors
    • 6.4.3 E-commerce
    • 6.4.4 Retail Stores
    • 6.4.5 Others

• 7 Competitive Analysis

  • 7.1 Key Player Comparison
  • 7.2 Market Share Analysis
  • 7.3 Investment Trends
  • 7.4 SWOT Analysis

• 8 Research Methodology

  • 8.1 Analysis Design
  • 8.2 Research Phases
  • 8.3 Study Timeline

• 9 Future Market Outlook

  • 9.1 Growth Forecast
  • 9.2 Market Evolution

• 10 Geographical Overview

  • 10.1 Europe - Market Analysis
    • 10.1.1 By Country
      • 10.1.1.1 UK
      • 10.1.1.2 France
      • 10.1.1.3 Germany
      • 10.1.1.4 Spain
      • 10.1.1.5 Italy
  • 10.2 Asia Pacific - Market Analysis
    • 10.2.1 By Country
      • 10.2.1.1 India
      • 10.2.1.2 China
      • 10.2.1.3 Japan
      • 10.2.1.4 South Korea
  • 10.3 Latin America - Market Analysis
    • 10.3.1 By Country
      • 10.3.1.1 Brazil
      • 10.3.1.2 Argentina
      • 10.3.1.3 Mexico
  • 10.4 North America - Market Analysis
    • 10.4.1 By Country
      • 10.4.1.1 USA
      • 10.4.1.2 Canada
  • 10.5 Middle East & Africa - Market Analysis
    • 10.5.1 By Country
      • 10.5.1.1 Middle East
      • 10.5.1.2 Africa
  • 10.6 Graphite and Carbon Sealing Gasket Sales Market by Region

• 11 Global Economic Factors

  • 11.1 Inflation Impact
  • 11.2 Trade Policies

• 12 Technology & Innovation

  • 12.1 Emerging Technologies
  • 12.2 AI & Digital Trends
  • 12.3 Patent Research

• 13 Investment & Market Growth

  • 13.1 Funding Trends
  • 13.2 Future Market Projections

• 14 Market Overview & Key Insights

  • 14.1 Executive Summary
  • 14.2 Key Trends
  • 14.3 Market Challenges
  • 14.4 Regulatory Landscape

Segments Analyzed in the Report

The global Graphite and Carbon Sealing Gasket Sales market is categorized based on

By Product Type

• Graphite Sealing Gaskets
• Carbon Sealing Gaskets
• Flexible Graphite Sealing Gaskets
• Expanded Graphite Sealing Gaskets
• Carbon Fiber Sealing Gaskets

By Application

• Automotive
• Industrial
• Aerospace
• Oil & Gas
• Electronics

By Distribution Channel

• Direct Sales
• Distributors
• E-commerce
• Retail Stores
• Others

By Material Type

• Natural Graphite
• Synthetic Graphite
• Carbon Fiber
• Carbon Black
• Other Carbon Materials

By Region

• North America
• Europe
• Asia Pacific
• Latin America
• Middle East & Africa

Key Players

• Gasket Group
• Frenzelit GmbH
• Flexitallic
• Garlock Sealing Technologies
• Sealing Devices Inc.
• EagleBurgmann
• John Crane
• Teadit Group
• ElringKlinger AG
• Hennig Gasket & Seals, Inc.
• Saint-Gobain Seals
• Graphite Metallizing Corporation
• James Walker
• Rheem Manufacturing Company
• Lambda Gasket