DOWSIL 7094 Liquid silicone for repairing photovoltaic sheets

98,50 zl PLN

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Cechy szczególne: Dobra przyczepność do wielu podłoży, Klej/uszczelniacz jednoskładnikowy, Utwardzanie Alkoxy (Neutralny))

Niska temperatura: od -31°C do -50°C

Przemysł: Fotowoltaika

Typ produktu: Silikon

Wysoka temperatura: +151°C do 200°C

Zastosowanie: Fotowoltaika, Fotowoltaika - Backsheet, Wielozadaniowe

DOWSIL™ 7094 Flowable Sealant - 310ml Black

Liquid sealant, self-leveling low modulus silicone, black

Used to repair the back sheets of photovoltaic panels

DOWSIL™ 7094 Flowable Sealant cures under ambient conditions into a highly durable elastomer, building chemical adhesion and acting as an electrical insulator. Once cured, it provides insulation restoration and protection against water ingress and UV sunlight.

Due to the excellent durability of silicone sealants, with proven outdoor stability for over 50 years, this product offers a long-term, reliable repair solution.

Application:

DOWSIL™ 7094 Liquid Sealant has been developed for the protection, durability and decoration of building and photovoltaic (PV) applications where high durability, safety and flexibility are important. The high temperature and UV resistance of this coating make it suitable for indoor and outdoor applications.

Sealer 7094 is an efficient and long-lasting solution for both field repair of PV modules that have shown degradation of the backing,
and factory backsheet protection.

  • Sealing and bonding where low viscosity and self-leveling properties are required in combination with non-corrosive curing
  • Designed for applications that require a strong but flexible bond, such as when joining materials with different coefficients of thermal expansion, e.g. glass to metal or glass to plastic
  • Low modulus formula for high mobility
  • Sealing gaps where flexible grouting is required

    Features and Benefits:

    • One-component sealant
    • It cures at room temperature under the influence of atmospheric moisture
    • Alkoxy curing system
    • Smooth and self-leveling
    • Easy to apply
    • Excellent primerless adhesion to many substrates
    • Stable and flexible from -50°C to +180°C
    • Does not corrode metals
    • Weak smell
    • Unprimed adhesion to various substrates

    Benefits of applications in photovoltaics

    1. Reliably fills cracks in the backing - including deep cracks
    2. Restores electrical insulation resistance
    3. Can be applied by brush or spray in the field - no disassembly of the unit required
    4. Good adhesion to co-extruded polyamide ("AAA") as well as other commonly used backsheets (including PVF, PET or PVDF backsheets)
    5. Short curing time
    6. Highly durable material, leading to a long service life

    Properties and Parameters of Dowsil 7094

    Adhesion to Substrates: Acrylic, Acrylonitrile Butadiene Styrene (ABS), Aluminum, Copper, Glass, Nylon 6/6, Polycarbonate, Steel, Galvanized, Steel, Low Carbon, Steel, Stainless Steel
    CTM Parameter Unit Value
    Adhesion to substrates

    color Black or white
    0097B Density g/cm3 1.30 Specific gravity at 23°C (75°F) 1.3
    50 Viscosity mPa s 28000
    98 Skin formation time (23°C, 50% RH) min. 25
    0095A Drying time (23°C, 50% RH) min 50
    curing time (23°C, 50% RH) 0.4mm min 75
    Mechanical properties, curing 7 days in air at 23°C and 50% relative humidity.
    0137A Tensile strength

    mPa
    dog

    1.2
    174

    0137A Elongation at break % 400
    0137A Module at 100% mPa 0.36
    99 Hardness Shore A 19
    ASTM D0149 dielectric strength kV/mm 19
    ASTM D0257 Volume resistivity ohm cm 2.5 x 10 to 15
    UL94 Flammability class HB
    UL746B Relative thermal Relative Thermal Index (RTI) °C 105

    Packaging and colors

    • Black colour
    • 310 ml cartridge,

    Durability and Storage

    When stored below 30°C in the original, unopened containers, this product has a shelf life of 12 months from the date of manufacture.


    How to use

    Substrate preparation

    All surfaces must be clean and dry. Degrease and wash off any impurities weakening adhesion. Suitable solvents include isopropyl alcohol, acetone or methyl ethyl ketone. Unprimed adhesion can be achieved on many substrates, such as glass, metals (e.g. steel, aluminum) and most engineering plastics (e.g. polyamide, polycarbonate). Adhesion may be less effective with some low energy plastics such as polyethylene, polypropylene and PTFE.

    How to Apply

    DOWSIL™ 7094 Liquid Sealant is ready to use. Apply a sufficient amount of DOWSIL™ 7094 Flowable Sealant to one of the prepared surfaces, then quickly coat the other substrate to be bonded.

    Curing time

    If exposed to moisture, the freshly applied material will "skin" in approximately 25 minutes at room temperature and 50% relative humidity. Any processing should be completed prior to this crust formation. The surface can be easily treated with a spatula. The sealant will become dry after approximately 50 minutes. Full hardening of the 2mm joint occurs after 24 hours.

    Photovoltaic materials selection guide - DOW photovoltaic materials selection guide.pdf

    Application in photovoltaic panels

    PV back sheet "backsheet" is a photovoltaic laminate that is designed to protect the internal components of the module, in particular photovoltaic cells and electrical components from external stresses, UV radiation, moisture and weather conditions, and also act as an electrical insulator.
    To achieve this, the solar panel material is protected already during production or in the case of subsequent service repairs, the resulting cracks are glued and sealed with Dowsil 7094 liquid silicone.

    1. Clean the surface of the bottom layer. The type of cleaning depends on the degree of soiling and the degree and type of degradation of the backing layer. In general, the following cleaning procedure is sufficient: wipe the surface of the backing with a damp cloth and then with a dry cloth.
    2. Apply DOWSIL™ 7094 Liquid Sealant with a squeegee, brush or spray gun.
    3. Immediately smooth the layer with a spatula, pressing lightly with gentle force to push the sealant into the gaps.
    4. Leave to harden

      Photovoltaic module

      solar photovoltaic panel


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      4. solar cells
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      7. Junction box/inverter
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