Sealing, Insulation and Protection for HVAC Systems

Heating and air conditioning systems whether commercial or domestic need to be efficient, reliable and most importantly, safe in operation. Due to their continual use, materials and components that make up HVAC units need to be able to withstand stresses such as high temperatures, vibration and environmental constraints. Seal and gasket failure, vibration damage and overheating are all common factors that cause HVAC units to breakdown which causes downtime and potential high maintenance costs.

HVAC design engineers need materials that ensure long lifespan and efficiency whilst providing safety when the systems are in place.

Common Industries using HVAC systems

  • Mass Transit – Rail, Aerospace, Buses
  • Construction – Commercial and Domestic

Silicone Material Solutions

kSil™ and expanSil™ silicone sponge has been specially formulated to provide excellent performance under common stresses of HVAC units, especially within Mass Transit applications. Common HVAC applications are:

  • Enclosure Gaskets
  • Thermal Insulation
  • Acoustic Insulation
  • Vibration Dampening
  • Environmental Seal

Silicone sponge is used in a number of applications within HVAC systems. Due to its excellent compression set, it is commonly used as seals and gaskets providing protection from water and dust ingress.

Silicone sponge is also used as an insulator both thermally and acoustically. Thermally, silicone sponge is the ideal material to insulate an application due to its closed cell structure giving it excellent insulating properties. This means it can be applied as gap fillers and within cavities within the HVAC unit. Acoustically, kSil V-0 can dampen noise generated from the HVAC fans or the electric motors. For HVAC units within rail carriages, buses or other mass transit vehicles, silicone sponge dampens vibrations and rattles caused by movement on road or track.

DownloadHVAC V-0 Flyer

Agriculture & Dairy

Silicone rubber tubing is used extensively in the Dairy Industry.

Demands for higher standards of quality and improved yields have seen silicone rubber products replace organic rubbers across a wide range of applications including dairy tubing. With its high strength and resilience properties, silicone is an ideal material for dairy tubing which is often exposed to the elements and subjected to harsh treatment.

Silicone Engineering’s suraSil™DS range of dairy tubing offers the highest Durability, Flexibility and Hygiene performance and is what sets us apart from the competition.


suraSil™DS dairy tubing has been specially formulated to provide strong wall structure and is tested to withstand the daily wear and tear of dairy parlours.


suraSil™DS dairy tubing stays flexible up to -60°C, ensuring no cracking or splitting occurs during cold winter temperatures.


suraSil™DS dairy tubing has been specially designed with an ultra-smooth inner surface to reduce the risk of particle build up from the milk. The smooth inner surface of the tube increases the efficiency of daily hygiene cleaning, reducing the risk of harmful bacteria build up.

Silicone Engineering’s suraSil™DS is our standard dairy tube. Below is a technical data table showing the mechanical properties:

Tear StrengthN/mm (lb/in)20 (114)20.26 (115.7)
HardnessShore A6070
Tensile StrengthMPa (Psi)8.7 (1262)10 (1445)

Other materials in our dairy range include:-

suraSil™DX Extreme High Tear dairy tubing for ultimate durability

neutraSil™ Antimicrobial silicone proven to prevent growth of harmful bacteria

Twin Air Pulse Tubing Used for efficient milk flow

Agriculture Products

The dairy industry demands a very specific type of tubing. It must be highly flexible, resilient and reliable, and also have the hygiene properties to satisfy international food standards. Silicone Engineering has over 25 years’ experience in producing tubing for the dairy industry.

All silicone tubing has been perfected so that is easy to install, maintain and replace. Other applications of silicone in this sector include cow mats, milking liners, air hoses and machine seals and gaskets.

Silicone Engineering has also developed an anti-microbial silicone called neutraSil™ that actively prevents the growth of harmful bacteria. Products made from neutraSil™ are raising the standards of safety across the industry.

LED Lighting

Silicone Solutions for LED Lighting Systems

In today’s elastomer market, the range of rubbers available to lighting engineers, designers and buyers is extensive. So much so, that when analysing the list of rubber properties, it is very easy to get lost in a maze of grades, forms, specifications, thickness’s and hardness’s.

Failure to choose the correct sealing material often leads to failure in application. This is commonly caused by water, moisture or dust ingress within electrical enclosures causing downtime and repair costs. Therefore it is vital to analyse and chose the correct materials to ensure failure is prevented.

When to Choose Silicone Rubber?

Silicone rubber excels at high temperatures and provides excellent sealing properties for LED lighting systems and electrical enclosures that are exposed to outdoor conditions.

Due to silicones’ extreme temperature resistance, chemical stability and low compression set, it is the material of choice in many LED lighting applications as it performs comfortably with high heat generated from the diodes. Silicone also has excellent environmental resistance allowing for use in outdoor applications where protection from weathering is critical for performance.

Benefits of kSil™ Silicone Sheeting

  • Smooth Skin – better sealing performance
  • UL94-V0 and V1 approved grades
  • Low smoke/toxicity grades
  • Closed Cell Sponge – Low water and dust ingress
  • Low Compression Set and Deflection
  • Excellent Tear Resistance
  • Light Weight
  • Flexible – Easily Applied
  • Vibration Dampening
  • Extreme Temperature Range: +230°C to -60°C (+446°F to -76°F)
  • Weather Resistant – UV, Ozone, Frost, Rain – ideal for outdoor LED applications
  • Low out-gassing
  • IP65 and IP66 achieved (subject to design of components)


  • Rolls and Sheets – Solid and Sponge / Foam
  • Rolls: Up to 50mtrs solid and 20mtrs sponge (on selected grades and dimensions)
  • Sheets: 1m²
  • Sponge / Foam Extrusions (expanSil™)
  • Pressure Sensitive Adhesive backing (PSA)
  • Cut Gaskets
  • Joined rings

Food & Beverage

Its temperature resilience, as well as its non-stick and inert properties, means silicone rubber has wide ranging applications in the food and beverage production industries.

Silicone Engineering’s clients are drawn from all over the world and have previously included Heinz, Kraft Foods and Cadbury’s.

With its hygienic, durable and flexible properties as well as being temperature resilient and and non-stick, silicone rubber has a variety of applications which can be applied in the following sectors;

  • Food Processing
  • Dairy
  • Vending Tubing
  • Breweries
  • Antimicrobial Belting

Food Processing

The food processing industry calls for tighter regulations and specifications in order to maintain a high level of health and safety. Silicone rubber is widely used throughout the industry due to its high temperature rating and great sealing properties making it ideal for cooking and mixing processes. Silicone seals and gaskets can be used on food processing machinery such as dough and cake mixers in bakeries. As all of our silicone is FDA approved, food manufacturers can be confident that the silicone rubber used is completely safe when in contact with food.

Dairy Industry

Demands for higher quality standards and improved yields have seen silicone rubber replace organic rubbers across a wide range of applications. Durability and hygiene are the most common factors influencing the transition over to silicone. With Silicone Engineering’s suraSil™DS range of dairy tubing, durability, flexibility and hygiene performance are what sets us apart from the competition.

suraSil™DS dairy tubing has been specially formulated to provide strong wall structure and is tested to withstand the daily wear and tear of dairy parlours.

suraSil™DS dairy tubing stays flexible up to -60°C ensuring no cracking or splitting occurs during cold winter temperatures.

suraSil™DS dairy tubing has been specially designed with an ultra-smooth inner surface to reduce the risk of particle build up from the milk. The smooth inner surface of the tube increases the efficiency of daily hygiene cleaning, reducing the risk of harmful bacteria building up.

Vending Tubing

Vending machines serving hot drinks such as tea and coffee require not only the health and safety benefits of silicone but also its physical properties to withstand high temperatures and high levels of usage. Silicone Engineering’s suraSil™ tubing is commonly used as delivery tubes to transport the hot beverage from the machine to the cup. The smooth inner surface of the tubing helps reduce the buildup of residue left by the beverage, and also makes cleaning much more efficient.

As Silicone Engineering’s vending tubing is compliant with FDA, BfR and WRAS approvals, suraSil™ is ideal to be used in vending machine applications. Our silicone ensures no taste contamination and offers the durability to withstand constant use. The suraSil™ range is available in A-scale shore hardness of 30 to 80 for extrusions.


With over 25 years’ experience, Silicone Engineering is now able to provide brewery manufacturers a product that is durable, translucent and affordable. Our range of silicone tubing has a low bursting pressure, which means that it can be used for brewery hoses / gaskets / process valves. Whilst many brewery manufacturers may still prefer to use copper pipes when brewing their beer, other mainstream manufacturers have identified silicone tubing as easy to install, maintain and replace. The tubing is translucent, making the flow of liquid and air bubbles visible. If you’re looking for the best grade tubing to use for brewing, use silicone.


Silicone Engineering solid GP products are fully compliant with the requirements of the U.S Food and Drug Administration (FDA) and the German BfR.

Products have also been tested and approved by the Water Regulations Advisory Scheme (WRAS). This means that all our general purpose (GP) products can be used with drinking water up to 85°C.

We provide a range of products that are widely used in the food and beverage industry, these include;

Discover the benefits of FDA Silicone Sponge Sheeting

Silicone Engineering’s fully FDA approved silicone sponge sheeting is the ideal material for the food, beverage and pharmaceutical industry.

Tested and fully approved by the Food and Drug Administration for the full list of ingredients within the sponge formula, the silicone sponge can be used with complete safety in food applications, whether the food be dry, aqueous or fatty.

FDA silicone sponge rubber has a variety of applications which can be applied in the following sectors;

  • Food and Beverage Manufacturing
  • Bakeries
  • Medical
  • Pharmaceutical

The new material has been independently tested by Toxikon to analyse the total extractable substances, and proven to meet all criteria for extractables required by FDA 21 CFR 177.2600.

The composition of this product has also been positively assessed according to German BfR recommendation XV on silicone for food contact (BfR Empfehlungen XV zu Silicone).

We also manufacture other grades of silicone sponge sheets

Food Safe

Our food grade silicone sponge can be applied in a number of forms, most commonly as gaskets and seals to provide excellent sealing properties in machinery or units due to its exceptional compression set (5%) and high elongation 500% to 600%. With its extremely low water absorption properties, water, dust and dirt ingress is prevented from entering the machinery and more importantly the product.

PropertyUnitsTypical Value
DensityKg.m-3 (lb.ft-3)420 (26)
Compression Stress 40% StrainkPa (psi)90 (13)
Elongation to Failure%590
Compression Set 50% comp.

24 hrs. recovery 22hours

@ 70˚C (158˚C)

All known FDA sponge products currently on the market, only state ‘compliance to’ FDA standards such as the extraction requirement. This does not mean the product is fully FDA compliant. Silicone Engineering has developed a silicone sponge that can be officially called FDA approved. The sponge rubber is prepared using only ingredients that are permitted for use by FDA 21 CFR 177.2600.

Along with full FDA approval, silicone’s high temperature resistance makes it a material of choice when high heat is being applied to food and beverage processes. With a standard temperature range from 230°C to -60°C, silicone can be applied in extreme environments whilst maintaining its high performance sealing properties.

In addition to our FDA silicone sponge, our solid silicone is fully compliant with FDA regulation 21CFR177.2600, EC1935/2004 as well as being WRAS approved (Water Regulations Advisory Scheme) for contact with drinking water.


Features & Benefits of kSil™VAC Membrane Sheets

  • Extreme high tear strength
  • High elasticity (780%)
  • Improved abrasion resistance
  • Ability to withstand puncture damage without catastrophic failure
  • Excellent Durability and Lifespan
  • Developed specifically for use as silicone vacuum membranes
  • Supplied as standard in Translucent
  • Capability to colour match if required

Discover where silicone rubber is used in the Renewable Energy Sector

Silicone is widely used in the energy sector. Due to its inherently unique properties, especially thermal and chemical stability within a wide temperature range, silicone lends itself to high performance in high powered, outdoor environments. Also being Ozone and UV resistant, it is the ideal material to withstand environmental elements.

Wind Energy

In the case of wind-generated energy, silicone’s outstanding weathering properties offer superb protection for turbines, which are exposed to extreme environmental conditions. Silicone is generally used as seals and gaskets in wind turbine structures to provide excellent protection from the weathering elements whilst at the same time ensuring low water and dust ingress, which could potentially cause failure. With silicone’s extreme temperature range (-60°C to +230°C) the material will not degrade with fluctuations in high and low temperatures unlike more conventional rubbers.

Solar Energy

Silicone rubber is also used in the manufacturing of solar panels as vacuum membrane sheets. The vacuum membrane sheets provide high elasticity under vacuum where increased pressure is used to bond the solar cells together. In this process the most important property of silicone is its elongation, tear strength and lifespan. kSil™VAC has been tested and proven to clearly outperform the durability of organic polymers. kSil™VAC vacuum sheeting is available in sheets and rolls up to 1800mm wide.


In building and construction, silicone rubber products make construction materials work better, for longer.

Silicone rubber is helping to shape the designs of today’s modern buildings. From intricate silicone profiles and sections which are fitted to glass, steel and plastics, silicone has many uses in the construction industry.

Silicone materials are widely used in vibration management of buildings. Silicone acts to absorb vibration, stresses and movement in buildings, especially taller structures that are prone to slight movement from wind or ground vibrations.

As well as providing vibration management, silicone’s excellent sealing properties from water, dust and dirt ingress makes it the ideal material to use in the building and construction industry. Due to silicone’s excellent UV and Ozone resistance, silicone has a longer lifespan than other rubbers when used in a range of outdoor environments. With its wide temperature range of 230°C to -60°C, silicone can be used globally coping with the heat of the Middle East to the harsh winters of Scandinavia, Russia or Canada.

Silicone also protects joints and materials from harsh weather, moisture, heat, corrosion, sunlight, pollution and other chemicals.

Construction Products

Silicone Engineering manufactures a wide selection of materials for use in the construction industry. General-purpose GP grades are ideal for silicone seals and gaskets such as window seals and anti-vibration pads.

Flame retardant grade (FR) and low smoke, low toxicity grade (LCH) are used in applications where safety in paramount, especially in public areas. Silicone Engineering can design, prototype and test silicone products to suit your specific needs.

Oil & Gas

Increase efficiency, quality and reliability with silicone solutions for the Oil & Gas Sector

The oil and gas sector is vast and with global demand ever increasing for natural resources, reliability and excellent lifespan of materials used in this sector are required to ensure performance can withstand the demand. From equipment, health & safety to maintenance and repairs, the level of quality has to be of the highest order to ensure failure is reduced to a minimum.

How does silicone rubber improve efficiency in Oil & Gas sector?

Well known for its extreme temperature and environmental resistance, silicone rubber lends itself to oil and gas pipeline construction. Silicone Engineering manufacture and supply kSil™ sheeting, which can go up to +270°C and as low as -60°C (+518°F to -76°F). With such stability at a wide range of temperatures silicone can be used in the construction of pipelines running through extremely cold environments such as Russia, Scandinavia and Canada to hotter environments such as the Middle East and Africa. With its inert properties and environmental resistance to UV and Ozone, lifespan is increased and more importantly risk of failure decreases significantly.

Pipeline support gaskets and thermal insulation are the two common applications of both kSil™ solid sheeting and kSil™ closed cell sponge sheeting. Solid support gaskets sit neatly within the pipeline support brackets spaced evenly along the path of the pipeline. The silicone gaskets provide a fixed cushion between the metal support bracket and the pipeline to avoid metal on metal contact. This reduces the risk of damage should the pipeline move. The gasket also acts to reduce vibration from the pipeline which again prevents damage to the pipe.

Although silicone can withstand high heat, it also has excellent thermal insulation properties. Used to insulate pipelines, silicone sponge ensures controlled temperatures are maintained when running through cold environments.

Oil & Gas Silicone Solutions from the Silicone Experts

With an extensive range of silicone formulations and our own on-site, state of the art laboratory, Silicone Engineering are experts in the silicone arena. With our 55 years expertise in silicone rubber we are well placed to advise on the material and how it should be used.

Got a question? Place a general enquiry by clicking here.

Oil & Gas Products

Silicone rubbers can be applied to a wide range of applications in this sector, utilising silicone’s generic properties of high temperature resistance and excellent environmental resistance. Silicone Engineering specialise in working closely with companies to understand the exact requirements needed from a silicone material to allow the correct grade to be specified for the application.

kSil™ silicone sponge and silicone solid sheeting grades are widely used in the Oil & Gas sector. With silicone’s extreme temperature resistance and excellent environmental resistance, the material is perfectly placed to withstand the high performance required in heavy industrial applications. With pipelines also being exposed to ranging temperature extremes both hot and cold, silicone remains stable from -60°C to 230°C with an extreme high temperature grade kSil™THT, being available that can withstand temperatures up to 270°C.

As well as producing specialty materials, Silicone Engineering has a wide range of general purpose grades that can be be extruded as profiles and sections for seals and fabricated gaskets.


Silicone Rubber for Aerospace Applications

With the outstanding ability to withstand incredible stresses and temperature extremes, silicone rubber is widely used throughout the Aerospace and Aviation industries.

In an industry with no margin for error, it is important to know that a reliable company with vast experience in the aerospace industry is supplying your silicone solutions. Silicone Engineering have been manufacturing and supplying specialist silicone products for the aerospace sector for over 40 years.

Having been previously owned by aerospace giants Meggitt PLC and Bestobell Aviation, Silicone Engineering have built a vast amount of knowledge and expertise in silicone rubber applications specific to aviation.

Working with Boeing, Rolls Royce, Airbus, BAE Systems and Agusta Westland, Silicone Engineering have not only developed approved aircraft silicone grades, we also have the capability to produce bespoke silicone rubber solutions, engineered to meet the specific needs due to our state of the art laboratory facilities we have on site. This means custom silicone solutions can be trialed and tested to meet certain specifications.


  • Boeing BMS 1-60
  • AFS 1682 A
  • AMS 3195G and AMS 3196F
  • ASTM D2137

Aerospace Applications for Silicone

Supplied in various forms, silicone rubber is used to seal, insulate and protect aircraft parts such as:

  • Door Seals
  • HVAC Seals
  • LED Lighting Gaskets
  • Vibration Dampening
  • Windows Seals
  • Thermal Insulation
  • Instrument Panel Seals
  • Vent Ducts
  • Engine Gaskets

DownloadAerospace Applications


Silicone for Automotive Sealing & Protection

Silicone rubber delivers the strength, resistance and durability needed in automotive applications.

As consumers demand an increase in power and performance, the increase of heat that is generated as a result is a factor that engineers have to consider and manage. Automotive manufacturers rely heavily on the quality and performance of rubber materials and with increasing heat present in new vehicles, silicone rubber comes into its own.

Due to the temperature rise, there has been an increase in silicone usage being used in new vehicles as EPDM gets replaced due to its inferior temperature performance (140°C max).

With high temperature resistance from 230°C to -60°C and outstanding weathering properties, silicone rubber can extend the service life of automotive assemblies. Its resistance to rain, wind, salt, abrasion, ultraviolet radiation and chemicals make silicone the material of choice in the automotive sector.

Automotive Applications

Silicone rubber is used in a wide range of car parts including:

  • EV Battery Seals
  • Airbags
  • Engine gaskets
  • Headlamps
  • Ignition cables
  • HT Cables
  • Grommets
  • Radiator seals
  • Performance hoses
  • Vibration dampening
  • Shock absorbers
  • Spark plug boots
  • Ventilation flaps

As well as being used on vehicle exteriors, silicone automotive products are also used in the interior providing cushioning, load bearing, vibration suppression and protective shock absorption qualities to car seats and dashboards  – enhancing the comfort and driving experience.

Silicone Engineering’s automotive parts have gone on to be used by a number of the car manufacturing giants including BMW, Volkswagen and Ford. Our high quality materials and our 55+ years manufacturing silicone rubber, give automotive manufacturers the guarantee that they are dealing with the silicone experts.

Silicone seals for mass transit interiors

Silicone sponge is quickly becoming the material of choice for sealing, insulating and protecting a whole host of mass transit interiors.

Offering outstanding durability, temperature resistance and exceptional longevity, silicone seals are renowned for preventing water, moisture and dust ingress, reducing the risk of failure and meeting compulsory safety specifications including flame resistance and low smoke toxicity.

Used across an extensive range of mass transit applications, silicone sponge allows engineers to benefit from a whole host of mechanical properties and advantages including; reduced vibration and noise, reliability and fire safety – core components across the mass transit industry.

Providing world class sealing properties to IP67, silicone sponge seals and gaskets not only ensure the safety, durability, and reliability of all mass transit interior applications, but they also last the lifespan of the actual vehicle itself, heavily reducing repair and maintenance costs

If you require any further information about silicone EV mass transit battery seals, please do not hesitate to get in touch.

Rail & Mass Transit

Flexible Silicone Solutions for the Rail Industry

Public transport connects people across the world and, with increasing demands in the industry, performance and passenger welfare need to come first. Networks should strive to deliver an efficient service that is consistent and effective at all times.

From the underground and light rail, to more recent high-speed rail such as HS2, France’s TGV and China’s HSR systems, rail is one of the most important and busiest modes of transport, especially in highly populated areas.

With this comes the need for silicone materials that are durable, reliable and deliver exceptional performance, while meeting the health and safety standards needed to withstand intensive use.

Here at Silicone Engineering, we are experts in silicone for rail applications such as sealing, gaskets and acoustic designs and solutions. All of our specialised rail materials have been formulated and tested to meet the highest standards associated with the rail industry, including EN45545-2, NFPA130 (ASTM E162, ASTM E662, ASTM C1166), Bombardier SMP 800c, UL94-V0, BS 6853 Category 1 and NF F-16-101 Cat F0.

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