About Tenglong Sealing Products Manufactory, Yuyao - Fiberglass Supplier in China

Tenglong Sealing Products Manufactory is located in Yuyao, Zhejiang Province, China and lists 24 distinct products across construction materials, fiberglass, mechanical seals and related fire‑protective items. The catalogue includes high‑temperature anti‑burning cloth, high silica fiber glass cloth, silicone‑coated fiberglass cloth, various fiberglass yarns and tapes, as well as specialized sealing components such as graphite packing, PTFE‑Kevlar gland packing and stainless‑steel oil‑filled pressure gauges. Several items are recorded with HS codes, for example C Glass bulk glass fiber yarn (HS 7019.19), fiberglass blanket (HS 7019.90), graphite packing (HS 6815.10) and PTFE‑Kevlar aramid fiber packing (HS 8484.90). Materials span E‑glass, C‑glass, expanded graphite, PTFE, Kevlar aramid and acrylic‑PTFE composites, reflecting a broad mix of insulating and sealing technologies. The supplier’s trust tier is listed as “harbor”, indicating a mid‑level verification status within the platform.

Product Range and Specialties of Tenglong Sealing Products Manufactory, Yuyao

The product list features multiple grades of fiberglass cloth such as high‑temperature 3732 anti‑burning cloth, high silica fiber glass cloth and silicone‑coated variants, which are commonly supplied in widths of 1.0 - 1.5 m and weights ranging from 250 g m‑2 to 800 g m‑2 for industrial fire‑protection. Fiberglass yarns include C‑glass (ECR) yarn under HS 7019.19 and standard E‑glass yarn (HS 7019.90), typically offered in deniers from 200 dtex to 800 dtex and tensile strengths of 3.5 - 5.0 GPa. Tape and rope products such as vermiculite‑coated tape or lagging rope are usually wound on spools of 500 m length and packed in 20‑ft containers. In the sealing segment, graphite sheets and expanded graphite yarns (HS 6815.10) are produced to meet thermal conductivity of 150 - 250 W m‑1 K‑1, while PTFE‑based packings (HS 6812.99) are supplied with a purity of ≥99.9 % and melt flow index around 10 g 10 min. Industry standards for these categories include ASTM D2583 for fiberglass tensile strength, ASTM D2859 for fire‑resistance of blankets, and ISO 9001 quality management for manufacturing processes.

Trade and Export Information - Tenglong Sealing Products Manufactory, Yuyao

China is a leading exporter of fiberglass and high‑temperature sealing materials, with major destinations in the United States, Germany, the United Arab Emirates and South Korea for construction, petrochemical and aerospace applications. HS chapter 70 (glass fibres) and chapter 68 (articles of stone, plaster) dominate customs declarations for the listed yarns, blankets and tapes, while HS 84 and 85 cover the mechanical seals and pressure gauges. Buyers typically request CE marking, UL certification for fire‑resistant fabrics, and compliance with ASTM or ISO specifications depending on end‑use. Export shipments are commonly consolidated in 20‑ft or 40‑ft containers, using moisture‑barrier liners for cloth and yarn, and wooden pallets with shrink‑wrap for bulk packings. Chinese manufacturers of these products often hold ISO 9001 and ISO 14001 certifications, but buyers should verify the presence of any third‑party test reports such as SGS or Intertek before shipment.

Sourcing from Tenglong Sealing Products Manufactory, Yuyao - Buyer Guidance

When sourcing fiberglass cloth or yarn from this supplier, request a material data sheet that lists basis weight, tensile strength, elongation at break and fire‑rating (e.g., NFPA 701 or EN 13501‑1). For sealing components, ask for ASTM‑referenced test reports on compressive strength, chemical resistance and dimensional stability, as well as certificates confirming PTFE purity or graphite thermal conductivity. Verify the HS codes on the commercial invoice match the product descriptions to avoid customs delays, and confirm packaging details - typically 25 kg bundles for yarn and 1 m² rolls for cloth wrapped in vapor‑proof film. Samples of at least 1 m² of cloth or 500 g of yarn are standard practice to assess compliance before full‑scale orders. Finally, ensure that any claimed certifications (ISO, CE, UL) are accompanied by valid certificates and, where possible, recent third‑party inspection reports.

What are the typical specifications for the High Temperature 3732 anti‑burning cloth?

The 3732 anti‑burning cloth is usually supplied at 400 - 600 g m‑2 weight, with a fire‑resistance rating of at least 30 minutes under NFPA 701 and a tensile strength of 3.0 - 3.5 GPa. Buyers should request the ASTM D2859 test report and a material safety data sheet for thermal decomposition data.

Does the supplier provide E‑glass yarn under HS 7019.90 with documented tensile properties?

Yes, the catalogue lists fiberglass cloth (E‑glass) with HS 7019.90. Suppliers typically provide tensile strength values of 3.5 - 5.0 GPa, denier ranges, and an ASTM D2583 test report for each batch.

Which certifications are commonly required for fire‑proof blankets exported from China?

International buyers often require CE marking, UL 94 flammability classification, and compliance with EN 13501‑1 fire‑performance standards. Third‑party test reports from SGS or Intertek are standard proof of compliance.

What documentation should be requested for the PTFE‑Kevlar aramid fiber gland packing (HS 8484.90)?

Request a material data sheet showing PTFE purity (>99.9 %), Kevlar tensile strength, and a chemical resistance chart. Additionally, ask for an ISO 9001 certificate and a recent batch inspection report from an accredited lab.

How are graphite packing products (HS 6815.10) typically packaged for overseas shipment?

Graphite sheets and expanded graphite yarn are usually packed in moisture‑proof wooden crates, with each crate lined with anti‑static film. The standard container load is 20‑ft, containing up to 1 ton of product, with palletized bundles secured by shrink‑wrap.

What is the usual lead time for a bulk order of fiberglass lagging rope?

Manufacturers in China generally require 4 - 6 weeks from order confirmation to shipment for bulk rope orders, depending on yarn denier and length specifications. Lead time can be shortened with pre‑approved sample approval and confirmed production schedule.

Are there any specific import restrictions for PTFE‑based packings in the European Union?

EU importers often require compliance with REACH registration for PTFE substances and may request a Declaration of Conformity confirming that the material meets the EU Plastics Regulation. Providing an up‑to‑date REACH registration number is advisable.

What HS codes apply to the stainless steel oil‑filled pressure gauge listed in the catalogue?

The pressure gauge falls under HS chapter 84, typically classified as 9026.10 for pressure gauges. Buyers should verify the exact sub‑heading on the commercial invoice to ensure correct tariff treatment.