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 for the Dairy Industry

The dairy and agriculture sector demands a highly specific type of tubing from a quality engineering specialist, and Silicone Engineering is delighted to supply the specific silicone rubber products needed to serve this industry.

Quality demands for improved hygiene standards, lifespan and improved milk yields have seen silicone rubber products replace the more traditional organic rubber across a wide range of applications, predominantly dairy tubing. The combination of silicone’s durable, flexible and hygienic properties together with the quality engineering specialist knowledge from Silicone Engineering, this demand is met with excellence.

With its extreme temperature resilience, excellent elongation and resistance to weathering, silicone is an ideal material for dairy tubing, which is often exposed to the elements and subjected to harsh treatment in the milking parlour. It offers a robust solution perfectly suited to all-weather conditions, no matter how severe.

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

suraSil™DS data of technical mechanical properties

Other dairy tubing grades:

  • 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

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

Silicone Rubber for the Oil & Gas Sector

Increase efficiency, quality and reliability with silicone solutions for the oil and gas sector from engineering specialist Silicone Engineering.

The oil and gas sector is a vast industry 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.

Well-known for its extreme temperature and environmental resistance, silicone rubber lends itself perfectly to oil and gas pipeline construction.

From health and safety equipment through to maintenance and repairs, the level of quality has to be of the highest order to ensure failure is reduced to a minimum. This is where silicone rubber comes into its own, providing a host of appealing properties together with durable, highly resistant and flexible features.

Silicone rubbers can be applied to a wide range of applications in this sector, utilising properties of high temperature and excellent environmental resistance. Silicone Engineering are quality engineering specialists who work closely with oil and gas companies to understand the exact requirements needed for the silicone material to allow the correct grade to be specified for the application.



Silicone Rubber for Aerospace Applications

With the outstanding ability to endure 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 crucial to know that a quality engineering specialist with vast aerospace experience is supplying your silicone solutions. Silicone Engineering have been manufacturing and supplying specialist silicone products to the aerospace sector for over 40 years.

Having been previously owned by aerospace giants Meggitt PLC and Bestobell Aviation, Silicone Engineering have built vast knowledge and expertise in aviation-specific silicone rubber applications. We have developed and tested numerous silicone grades and our robust and reliable material is used throughout the industry to meet a number of specifications.

Working with Boeing, Rolls Royce, Airbus, BAE Systems, and Agusta Westland, Silicone Engineering have not only developed approved aircraft silicone grades but, as engineering specialists, can also develop custom solutions on-site.

Silicone Engineering have the expertise, state of the art materials, and technology to boast engineering specialist status serve the automotive and aerospace sector with silicone solutions that are second to none.


Silicone for Automotive Sealing & Protection

Silicone rubber delivers the strength, resistance and durability required for reliable automotive applications.

As consumers demand a boost in power and performance, the heat increase that is generated is a factor that engineers must consider and manage, and this is where a quality engineering specialist comes into play.

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, offering the perfect solution.

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 extreme temperature resistance from -60°C to 230°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.

Silicone Engineering is an engineering technical specialist and is firmly in the driving seat, leading the way in silicone solutions for the automotive industry.

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 underground and light rail systems, to more recent high-speed rail such as 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 (HL3)
  • NFPA 130 (ASTM E162, ASTM E662, ASTM C1166)
  • Bombardier SMP 800c
  • UL94-V0
  • BS 6853 Category 1
  • NF F-16-101 Cat F0

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