Import Expansion Volume 400ml/G Expandable Graphite — Buy in wholesale FOB from Supplier in China

Expansion Volume 400ml/g Expandable Graphite from Shandong Sungraf Carbons Co., Ltd is an industrial-grade intumescent material derived from natural graphite with a carbon content of 99%. It is engineered to expand rapidly under thermal stress, achieving a volume increase of 400 millilitres per gram when exposed to temperatures above 200°C. This expansion creates a low-density, carbonaceous char layer that acts as a thermal barrier, making it suitable for fireproofing applications in structural steel, electrical enclosures, and high-temperature insulation systems.

The material is produced through a controlled intercalation process that ensures uniform particle size distribution and consistent expansion performance. Typical industry standards for expandable graphite include a particle size range of 80 to 200 microns and a sulfur content below 50 ppm, both of which are aligned with this product’s profile. It is free from halogenated compounds and meets the general requirements for non-toxic, non-corrosive intumescent agents used in construction and manufacturing. The 99% carbon purity supports stable performance in oxidising environments and minimises degradation during prolonged thermal cycling.

This product is primarily sourced by manufacturers of fire-retardant coatings, thermal insulation boards, and battery separator films. Buyers include companies in the construction, automotive, and electronics sectors that require reliable passive fire protection. Packaging is supplied in 25kg multi-layer paper bags with moisture-resistant lining, suitable for containerised sea freight. Lead times are typically 15 to 25 days after order confirmation, and trade terms are negotiable on a case-by-case basis. Buyers should confirm the exact expansion curve under their intended heating profile before bulk procurement.

Shandong Sungraf Carbons Co., Ltd is a manufacturer and exporter of carbon-based materials based in Qingdao, Shandong Province, China. The company operates from a facility equipped for graphite processing, intercalation, and packaging, with direct access to port logistics. Its trust tier is listed as harbor, indicating verified export capacity and compliance with basic international shipping protocols. There is no public data on company size, years in operation, or client list, and no certifications are claimed on the listing.

The supplier focuses exclusively on industrial-grade carbon products and does not market consumer or retail lines. Response metrics show no recorded communication activity, suggesting the listing may be managed by an automated system or third-party agent. Buyers should treat this as a factory-direct sourcing opportunity but must independently verify production capability, quality control procedures, and consistency of batch-to-batch expansion performance before committing to volume orders.