Weihai Chengjing Technology Co., Ltd.
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Silicone, Polyurethane, and Specialty Sealants Manufactured for Export

Importers and distributors worldwide source construction and photovoltaic sealants from a 50,000 t/yr ISO 9001 certified factory in Weihai, China.

Contact usProduct Categories
Silicone Sealants
Fire-Retardant Sealants
Photovoltaic Module Sealants
50,000 tons per year
15 (est. 2010)
Years in operation
50,000 tons
Annual production capacity
Construction, Photovoltaic, Electric Power, Automotive
End markets served
ISO 9001, ISO 14001, UL94-V0
Certifications
50,000 tons per year
ISO 9001 Quality Management SystemISO 14001 Environmental Management SystemUL94-V0

Supplier-declared, pending confirmation

Product Categories

Silicone Sealants

One- and two-component silicone sealants covering general glazing, neutral weatherproofing, curtain wall, anti-mildew, high-temperature (-60 °C to 300 °C), and structural bonding applications.

  • CJ168 GP Acid Silicone Sealant
  • CJ777 Neutral Weatherproofing Silicone Sealant
  • CJ921 Curtain Wall Weatherproofing Sealant
  • CJ-704 RTV High-Temperature Sealant (-60 °C to 300 °C)
See all 6 products
  • GP Acid Silicone Sealant
  • Neutral Weatherproofing Silicone Sealant
  • Acid Silicone Sealant for Massive Plate Glass
  • Silicone Sealant Anti-Mildew
  • Weatherproofing Sealant for Curtain Wall
  • RTV High-Temperature Resistant Sealant
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Fire-Retardant Sealants

UL94-FV-0 and intumescent-grade sealants for fire and smoke penetration sealing, halogen-free and solvent-free formulations available.

  • CJ919 Fire-Proof Silicone Sealant (FV-0 rated)
  • CJ-135 Intumescent Fireproof Sealant (halogen-free, solvent-free)
  • CJ-131 Polymer Fireproof and Waterproof Sealing Sealant (two-component, freeze-thaw resistant)
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Photovoltaic Module Sealants

Neutral-cure silicone sealants and two-component potting adhesives (UL94-V0) engineered for solar panel sealing, bonding, and junction box encapsulation.

  • CJ-T28 PV Module Sealant (one-component, neutral-cure)
  • CJ-145 PV Junction Box Potting Adhesive (A:B = 5:1, UL94-V0)
  • CJ-992 Two-Component Structural Sealant for Insulating Glass
Cure type
Neutral, one-component, room temperature
Key feature
No pollution or corrosion on metal, suitable for harsh PV conditions
Application
Aluminum frame sealing of solar PV modules, junction box to back film bonding, solar lamp sealing
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Polyurethane Sealants and Foam

One- and two-component PU sealants with strong multi-substrate adhesion plus one-component PU foam for construction filling, insulation, and soundproofing.

  • PU Sealant (odorless, flexible, thixotropic)
  • CJ-998 PU Sealant for Door and Window Corners
  • Polyurethane Foam (filling, fixing, insulation, soundproofing)
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Epoxy Adhesives and Grout

Two-component epoxy systems for structural concrete patching (exceeds concrete strength in 3 hours), rebar anchoring, and anti-mildew tile grouting.

  • CJ-1455 Polymer Sealant for Concrete Patching (A:B = 1:1)
  • CJ-5567 Epoxy Anchoring Adhesive (rebar planting)
  • Epoxy Stitching Agent, Porcelain Tile Grout (anti-mildew, non-discoloring)
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MS, Acrylic, Nail-Free Adhesives, and Spray Paint

Silane-modified, acrylic, and construction grab adhesives for low-odor interior and exterior bonding, plus quick-drying aerosol spray paint for indoor and outdoor finishes.

  • MS Sealant (sprayable, UV-resistant, low odor)
  • Acrylic Sealant (sprayable, mildew-resistant)
  • Nail-Free Adhesive (non-toxic, paintable, waterproof)
  • Aerosol Spray Paint (quick-drying, flexible finish)
Drying
Quick drying
Finish
Durable and flexible
Substrate compatibility
Wood, metal, plastic, glass surfaces
Application
Furniture, decorative elements, metal constructions, repairs and refinishing, indoor and outdoor use
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Why Source from Chengjing

50,000 t/yr production capacity

A single site in Weihai producing 50,000 tons per year allows Chengjing to fulfil large-volume distributor and importer orders without subcontracting.

Full polymer chemistry range

Silicone, PU foam, PU, MS, acrylic, epoxy, and nail-free formulations are produced under one roof, simplifying sourcing for buyers who need multiple adhesive and sealant types.

ISO 9001 and ISO 14001 certified

Both quality management and environmental management systems are third-party certified, supporting buyers who must meet import or tender compliance requirements.

UL94-V0 rated fire-safe products

The CJ-145 PV junction box potting adhesive carries a UL94-V0 flame rating, and the CJ919 sealant meets FV-0 fire-retardant classification, enabling supply to regulated project types.

Sector-specific formulations

Dedicated product lines are formulated for construction, photovoltaic, electric power, and automotive applications rather than repurposed general-purpose products.

15 years of manufacturing experience

Founded in 2010, Chengjing has 15 years of continuous production in polymer sealing materials, giving importers a trackable supplier history.

Sourcing FAQ

What type of company is Weihai Chengjing, manufacturer, trader, or agent?

Chengjing is a direct manufacturer based in Weihai, China. Products are made at its own facility with an annual production capacity of 50,000 tons.

Which sectors do your sealants and adhesives serve?

Current product lines are formulated for construction, photovoltaic (solar) module assembly, electric power infrastructure, and automotive applications.

Which certifications do your products hold?

The company holds ISO 9001 (quality management) and ISO 14001 (environmental management) certifications. The CJ-145 PV Junction Box Potting Adhesive is UL94-V0 rated. Buyers should request product-level certification documents for specific SKUs before ordering.

What HS codes apply to your products?

Products are classified under HS 3214.10 (glaziers' putty, grafting putty, resin cements, and caulking compounds), 3506.10 (prepared glues and adhesives), and 3916.90 (monofilaments and rods of plastics). Buyers should confirm applicable codes with their customs broker for their specific import market.

Do you offer private-label or OEM formulation services?

This information is not confirmed in the current supplier profile. Submit an inquiry through the form below and specify your OEM or private-label requirements; the Chengjing team will respond directly.

How do I request pricing or product samples?

Use the inquiry form on this page, include the SKU name or product category, your target market, and estimated annual volume. The Chengjing team will follow up with pricing and sample availability.

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