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Dow Corning

  • Dowsil 781 Acetoxy Silicone Sealant – Box of 12

    £55.92

    Dowsil 781 Acetoxy Silicone Sealant is a one-part, silicone sealant which has good adhesion to a range of non-porous surfaces including glass, aluminium, painted surfaces and composite boards. It offers excellent resistance to ageing, shrinkage, cracking and discolouring. It is also approved in certain countries for use in contact with potable water once cured.

    TYPICAL PROPERTIES FOR DOWSIL 781

    These values are not intended for use in preparing specifications. Please contact your local Dow Corning sales office or your Global Dowsil Connection before writing specifications on this product

    HOW TO USE

    SURFACE PREPARATION

    Ensure that surfaces to be sealed are clean, dry, sound and free from frost, release agents, old sealants and other contaminants which could impair adhesion. All surfaces should be cleaned by wiping with a suitable solvent such as DOWSIL R40 Universal Cleaner on a clean oil- and lint-free cloth before application of sealant.

    Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Use solvent resistant gloves. Observe and follow all precautions listed on solvent container label.

    MASKING

    Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. Masking tape should be removed immediately after tooling.

    PRIMING

    All joint surfaces other than glass and glazed ceramics should be primed. Furthermore, for specific advice, please refer to the DOWSIL ® Primers’ Guide or contact one of Dowsil’s Regional Service Centre for technical assistance.

  • Dowsil 785 Clean Room Sanitary Silicone – Box of 12

    £56.40

    Dowsil 785 is a Clean Room Sanitary Silicone Sealant that protects against bacteria growth, E. coli & Salmonella. Making it ideal for use in clinical hygiene areas.  

    Gives excellent adhesion to most non-porous surfaces. DC 785 comes in 5 colours, clear and white being the most commonly used.

    It is a one-component sealant, resistant to mould growth, ideal for sealing around sanitary fittings to give a water-resistant, hygienic seal. It is the product of choice for use in critical hospital hygienic areas, such as operation theatres & clinical clean rooms, due to it being able to protect against a range of bacteria growth. Making this product ideal for professionals that are working in clean environments.

    Dowsil 785 Clean Room defends against bacteria growth, MRSA, E. coli and Salmonella. Contains a powerful fungicide to resist mould growth.

    • High Modulus HM (see Wikipedia for a brief explanation).
    • Mould resistant Sealant.
    • Acetoxy cure type.
    • 5 to 10 minutes of working time.
    • Fast cure tack free in one hour.
    • Ideal for use in hospitals & clean rooms as well as domestic dwellings & commercial premises.

    Another option for a like for like comparison would be Everbuild 565 Clean Room.

    For all other Dowsil products that we stock, please click here

  • dc-786

    Dowsil 786 Food Safe Silicone Sealant

    £4.97

    APPLICATIONS

    DOWSIL 786 is one part, flexible; fast curing silicone rubber sealant specifically designed for the sealing of refrigeration units and areas where contact with food is likely. Therefore making it ideal for food

    HOW TO USE

    Surface Preparation

    Ensure that surfaces to be sealed are clean, dry, sound and grease-free. Clean with DOWSIL R40 Universal Cleaner or methylated spirits depending on the substrates to be sealed, and dry thoroughly with a clean, lint-free cloth before application of sealant.

    Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Observe and follow all precautions listed on the solvent container label. Above all, it is recommended that DOWSIL 786 is not applied to surfaces that are below 5°C.

    Masking

    Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. After that, masking tape should be removed immediately after tooling.

    Priming

    Primer is not required on most common nonporous substrates, including vitreous enamel, ceramics, porcelain, glazed tiles, etc. However, for some metals and plastics, priming is required. For more information, please refer to the technical data sheet attached or contact Dow Corning.

    Back-Up Materials

    Where back-up material is required closed cell polyethene backer rod is recommended. Low tack polyethene tape should be used in joints too shallow to allow the use of the backer rod.

    Finishing

    The joint should be tooled within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling of the sealant also gives a smooth, professional finish.

    Clean-Up

    The excess sealant may be cleaned off tools and non-porous surfaces while in an uncured state using DOWSIL R40 Universal Cleaner. The cured sealant may be removed with the aid of
    DOWSIL Silicone Sealant Remover, abrasion or other mechanical means. However, care should be taken not to damage plastic surfaces.

    LIMITATIONS

    DOWSIL 786 Silicone Sealant should not be applied to porous surfaces such as stone or concrete, or to easily corroded metals such as lead or copper. DOWSIL 786 should
    not be used against surfaces that bleed oils, plasticisers or solvents. Also, contact Geocel’s Technical Services Department for further advice on specific applications.

  • Dowsil 786 Food Safe Silicone Sealant – Box of 12

    £59.64

    APPLICATIONS

    DOWSIL 786 is one part, flexible; fast curing silicone rubber sealant specifically designed for the sealing of refrigeration units and areas where contact with food is likely. Therefore making it ideal for food

    HOW TO USE

    Surface Preparation

    Ensure that surfaces to be sealed are clean, dry, sound and grease-free. Clean with DOWSIL R40 Universal Cleaner or methylated spirits depending on the substrates to be sealed, and dry thoroughly with a clean, lint-free cloth before application of sealant.

    Note: When using any solvent, always provide adequate ventilation. Avoid heat, sparks and open flames. Observe and follow all precautions listed on the solvent container label. Above all, it is recommended that DOWSIL 786 is not applied to surfaces that are below 5°C.

    Masking

    Areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. After that, masking tape should be removed immediately after tooling.

    Priming

    Primer is not required on most common nonporous substrates, including vitreous enamel, ceramics, porcelain, glazed tiles, etc. However, for some metals and plastics, priming is required. For more information, please refer to the technical data sheet attached or contact Dow Corning.

    Back-Up Materials

    Where back-up material is required closed cell polyethene backer rod is recommended. Low tack polyethene tape should be used in joints too shallow to allow the use of the backer rod.

    Finishing

    The joint should be tooled within 5 minutes of application to ensure good contact between the sealant and the substrate. Tooling of the sealant also gives a smooth, professional finish.

    Clean-Up

    The excess sealant may be cleaned off tools and non-porous surfaces while in an uncured state using DOWSIL R40 Universal Cleaner. The cured sealant may be removed with the aid of
    DOWSIL Silicone Sealant Remover, abrasion or other mechanical means. However, care should be taken not to damage plastic surfaces.

    LIMITATIONS

    DOWSIL 786 Silicone Sealant should not be applied to porous surfaces such as stone or concrete, or to easily corroded metals such as lead or copper. DOWSIL 786 should
    not be used against surfaces that bleed oils, plasticisers or solvents. Also, contact Geocel’s Technical Services Department for further advice on specific applications.

  • 791-silicone-box

    Dowsil 791 – Box of 12 – Weatherproof Low Mod Silicone

    £62.40£63.50

    Dow Corning 791 – Box of 12 – Weatherproof Low Mod Silicone

    Dow Corning 791 or DC 791 is a low modulus, neutral cure, alkoxy, odourless silicone sealant. It is specifically designed for the weather sealing of building components where high movement is anticipated. DC 791 adheres to a wide range of both porous and non-porous surfaces without the need for priming, making it ideal for a simple sealant solution.

    USES

    – Perimeter pointing internally and externally around uPVC /wood and aluminium.
    – Sealing and as an adhesive onto uPVC, plastic trims and components.
    – Can be used for sealing soft metals. For instance, lead, copper and zinc.
    – For weather sealing and joint sealing on pre-formed panels, Can also be used on curtain walls and glazing sealing.
    – Glass to glass sealing and glass to aluminium sealing. Parapet and roof weather sealing applications.
    – Suitable as an expansion joint sealant.
    – Bedding and sealing of Insulated Glass units.

    CHARACTERISTICS / ADVANTAGES

    – Excellent tooling and slow skinning properties. Therefore, it is ideal for large scale construction and glazing applications.
    – Has excellent adhesion – adheres to most common surfaces. For instance, glass, metals, plastics and wood (painted or unpainted), uPVC and polycarbonate.
    – Excellent external weathering properties, therefore, can be guaranteed over many years worth of exposure.
    – High viscosity non-slump formula. In other words, it will hold it’s structure & body on even larger joints.
    – Resistant to fumed Hydrogen Peroxide and fumed Formaldehyde.

    APPLICATION INSTRUCTIONS

    PRIMER

    Dow Corning 791 does not require a primer on most common surfaces, although adhesion tests are recommended before full-scale application. However, if the joint is likely to be immersed or if adhesion is poor (especially on porous surfaces) use a Dow Corning Primer.

    SUBSTRATE PREPARATION

    Ensure that the desired application area is dry and clean, containing no grease or other contaminants. For instance, remove dust with compressed air or de-grease by using a solvent soaked pad, following by wiping with a clean cloth.

    LIMITATIONS

    – Not to be used with bitumen asphalt, neoprene and certain organic elastomers, please refer to the datasheet.
    – Cannot be used in the manufacture of Aquariums.
    – Non-overpaintable.
    – Not recommended for use as a mirror adhesive.
    – Do not use on food grade applications
    – Do not use for in and around swimming pools. DC 791 is not suitable for swimming pool areas.
    – Can yellow if exposed to bleach or HCl based brick cleaners while curing.

    For any other Dow Corning products on our website, please click here.

  • dc-791

    Dowsil 791 Weatherproof Low Mod Silicone

    £5.33£5.50

    Dow Corning 791 or DC 791 is a low modulus, neutral cure, alkoxy, odourless silicone sealant. It is specifically designed for the weather sealing of building components where high movement is anticipated. DC 791 adheres to a wide range of both porous and non-porous surfaces without the need for priming.

    USES

    – Perimeter pointing internally and externally around uPVC /wood and aluminium.
    – Sealing and as an adhesive onto uPVC, plastic trims and components.
    – Can be used for sealing soft metals. For instance, lead, copper and zinc.
    – For weather sealing and joint sealing on pre-formed panels, Can also be used on curtain walls and glazing sealing.
    – Glass to glass sealing and glass to aluminium sealing. Parapet and roof weather sealing applications.
    – Suitable as an expansion joint sealant.
    – Bedding and sealing of Insulated Glass units.

    CHARACTERISTICS / ADVANTAGES

    – Excellent tooling and slow skinning properties. Therefore, it is ideal for large scale construction and glazing applications.
    – Has excellent adhesion – adheres to most common surfaces. For instance, glass, metals, plastics and wood (painted or unpainted), uPVC and polycarbonate.
    – Excellent external weathering properties, therefore, can be guaranteed over many years worth of exposure.
    – High viscosity non-slump formula. In other words, it will hold it’s structure & body on even larger joints.
    – Resistant to fumed Hydrogen Peroxide and fumed Formaldehyde.

    APPLICATION INSTRUCTIONS

    PRIMER

    Dow Corning 791 does not require a primer on most common surfaces, although adhesion tests are recommended before full-scale application. However, if the joint is likely to be immersed or if adhesion is poor (especially on porous surfaces) use a Dow Corning Primer.

    SUBSTRATE PREPARATION

    Ensure that the desired application area is dry and clean, containing no grease or other contaminants. For instance, remove dust with compressed air or de-grease by using a solvent soaked pad, following by wiping with a clean cloth.

    LIMITATIONS

    – Not to be used with bitumen asphalt, neoprene and certain organic elastomers, please refer to the datasheet.
    – Can not be used in the manufacture of Aquariums, use Aqua mate or CT1
    – Non-overpaintable.
    – Not recommended for use as a mirror adhesive.
    – Do not use on food grade applications
    – Do not use for in and around swimming pools. DC 791 is not suitable for swimming pool areas.
    – Can yellow if exposed to bleach or HCl based brick cleaners while curing.


    For any other Dow Corning products on our website, please click here.

  • Dowsil 796 PVC-U Wood Aluminium Silicone – Box of 12

    £41.00

    Dowsil 796 is a one-part, PVC-U, Aluminium & Wood Silicone Sealant. It is a low modulus, neutral cure silicone, specifically developed for the sealing of PVC-U, glass, glazed surfaces and brickwork.

    How to use

    Clean all joints of release agents, water repellents, dust, dirt, old sealants and other contaminants which could impair adhesion.

    Nonporous surfaces should be cleaned by wiping with a suitable solvent such as DOWSIL R40 Universal Cleaner on oil and lint-free cloth.

    Preparation Dowsil 796

    Masking areas adjacent to the joints should be masked with tape to prevent contamination of the substrates and to ensure a neat sealant line. Masking tape should be removed immediately after tooling.

    Primer is not required for PVC-U or most common construction substrates including brick. A test placement before general use is always recommended.

    To ensure a satisfactory seal, the joint should be tooled down within 5 minutes of application before the curing process takes effect.

    This product should be used in conjunction with a standard-sized silicone or caulking gun.

    Please contact Dowsil’s technical service department if you require further assistance

    For all other Dowsil products on our website, please click.

    For any further information you may need on Dowsil products, please visit the Geocel website here.

  • Dowsil 798 Cold & Clean Room Silicone

    £6.65

    Dowsil 798 Cold & Clean-room Silicone Sealant. The application used for sealing areas in refrigeration units and cold rooms, internal or external.

    Dowsil 798 Application

    Preparation

    Surfaces for application should be clean, free from dust, dry and stable. The temperature should be above 5 degrees for the use of DC 798.

    Back-up materials

    When back-up material is required, used a closed-cell polyethene backer rod that can be found in the related product section. AKA Joint backer rod.

    Finishing

    Once you have applied the Dowsil 798 into the joint, any tooling should be completed within five minutes.

    Clean-up

    If the sealant is misapplied to porous substrates, it should be left until just cured. Once cured then removed by peeling, cutting or other means ensuring not to damage plastic or coated surfaces.

    Joint design

    Width and depth of the application of Dowsil 798 are as following:

    6mm – 12mm width, a sealant depth of 6mm.

    12mm or above width, a width to depth ratio of 2:1 is required

    If you are using backing rod/backing jointing a minimum of 6mm sealant bite to each substrate is recommended.

    For further information about DC 798, please follow this link here.

    For our full range of Dowsil products, click here.

  • dc-798-box-of-12

    Dowsil 798 Cold & Clean Room Silicone – Box of 12

    £79.90 £64.80

    Box of 12

    Dow Corning 798 Cold & Clean-room Silicone Sealant. The application used for sealing areas in refrigeration units and cold rooms, internal or external.

    Dow Corning 798 Application

    Preparation

    Surfaces for application should be clean, free from dust, dry and stable. The temperature should be above 5 degrees for the use of DC 798.

    Back-up materials

    When back-up material is required, used a closed-cell polyethene backer rod that can be found in the related product section. AKA Joint backer rod.

    Finishing

    Once you have applied the Dow Corning 798 into the joint, any tooling should be completed within five minutes.

    Clean-up

    If the sealant is misapplied to porous substrates, it should be left until just cured. Once cured then removed by peeling, cutting or other means ensuring not to damage plastic or coated surfaces.

    Joint design

    Width and depth of the application of DC 798 are as following:

    6mm – 12mm width, a sealant depth of 6mm.

    12mm or above width, a width to depth ratio of 2:1 is required

    If you are using backing rod/backing jointing a minimum of 6mm sealant bite to each substrate is recommended.

    For further information about DC 798, please follow this link here.

    For our full range of Dow Corning products, click here.

  • 895-silicone-box

    Dowsil 895 – Box of 12 – Structural Glazing Sealant

    £136.80

    Dow Corning 895 is a neutral curing silicone sealant designed for structural bonding of metal, glass and other building materials. DC 895 can also be used for adhesive applications. The neutral cure cures at room temperature, via exposure to water vapour.

    Preparation:

    Ensure that all areas for application are thoroughly cleaned, removing all elements of dirt and oil/liquids. Ensure that all areas are cleaned with the correct cleaning equipment, i.e. metal, glass, or other surfaces should be cleaned with the recommended cleaning products.

    Installation

    DC 895 is a structural glazing sealant and should be applied at the factory stage of manufacture, allowing the ideal time to seal for best performance. Site application should only be carried out for remedial work, or when the glazing design does not allow otherwise.

    Technical Specs

    – Up to 2000 hours of exposure to UV radiation in hot water immersion.
    – 5000 load cycles in tension.
    – Resistance to extreme temperatures, SO£ and salt spray and cleaning agent
    – 4000 hours exposure to ultraviolet radiation under-maintained extension at 12.5%.
    – This adhesive meets the newly developed European Standard for structural glazing application the EOTA guidelines for SSGS.

    For more details, please view the Dow Corning 895 technical datasheet attached.

    For all other Dow Corning products on our website, please click here.

    For any further information, you may need, please visit the Geocel website here.

    Alternative products please see below, options like CT1 are available.

  • dc-895

    Dowsil 895 High Quality Structural Glazing Sealant

    £11.62

    Dow Corning 895 is a neutral curing silicone sealant designed for structural bonding of metal, glass and other building materials. DC 895 can also be used for adhesive applications. The neutral cure cures at room temperature, via exposure to water vapour.

    Preparation:

    Ensure that all areas for application are thoroughly cleaned, removing all elements of dirt and oil/liquids. Ensure that all areas are cleaned with the correct cleaning equipment, i.e. metal, glass, or other surfaces should be cleaned with the recommended cleaning products.

    Installation

    DC 895 is a structural glazing sealant and should be applied at the factory stage of manufacture, allowing the ideal time to seal for best performance. Site application should only be carried out for remedial work, or when the glazing design does not allow otherwise.

    Technical Specs

    – Up to 2000 hours of exposure to UV radiation in hot water immersion.
    – 5000 load cycles in tension.
    – Resistance to extreme temperatures, SO£ and salt spray and cleaning agent
    – 4000 hours exposure to ultraviolet radiation under-maintained extension at 12.5%.
    – This adhesive meets the newly developed European Standard for structural glazing application the EOTA guidelines for SSGS.

    For more details, please view the Dow Corning 895 technical datasheet attached.


    For all other Dow Corning products on our website, please click here. For tools, such as sealant guns and sealant finishing, please see our tools section here.

    For any further information, you may need, please visit the Geocel website here.

    Alternative products please see below, options like CT1 are available.

  • dc-c50-box-of-12

    Dowsil C50 High Modulus Bath & Kitchen Silicone – Box of 12

    £40.20

    Box of 12

    Dow Corning C50 is a high modulus silicone sealant, suitable for all sanitary applications & is available in White or Clear.

    HOW TO USE

    Preparation

    Surfaces are to be clean and dry, with no dust or dirt present on the joint. Any old sealant must be removed to avoid contamination and affect the adhesion.

    Priming

    Priming the surface is not required so long as the area of application is nonporous. It is always recommended to do a small test before the complete application is started.
    For more advice, please see the tech data sheets attached or contact for technical assistance.

    Finishing

    If you require finishing or tooling off to the applied DC C50, giving it a smooth and professional. This tooling must be done within 5 minutes. Any longer and the DC C50 will have had time to skin and adhere to the substrate.

    Clean-Up

    The excess sealant may be cleaned off tools and non-porous surfaces while in an uncured state using a universal cleaner. If the sealant is misapplied to porous substrates, it should be left until just cured, and then removed by peeling or cutting from the area.

    Joint Size

    When applying the DC C50, the minimum width should be 6mm.

    6mm to 12mm width – 6mm depth.

    12mm width – depth ratio of 2:1

     

    Please read the product and safety data sheets before use.

    For all other Dow Corning Products on our website, please click here.

    For any further information you may need on this product, please visit Geocels website here.