Import Agricultural Vermiculite — Buy in Bulk from Supplier in China

Agricultural vermiculite from Great Wall Mineral is a hydrated magnesium iron aluminum silicate hydroxide, classified within the Montmorillonite/Smectite Group of clays. This natural mineral originates as biotite or phlogopite and alters through weathering or hydrothermal processes, forming small platy mica-like crystals that contain structural water. When heated above 870°C, the water converts to steam, causing the crystals to expand by 2000 to 3000% of their original volume, a key property for industrial and agricultural applications.

The mineral is typically brown to golden brown, with white, colorless, or yellow variants also occurring. It exhibits a pearly to greasy luster, perfect basal cleavage, and a hardness of 1.5 on the Mohs scale, making it soft enough to leave marks on paper. The specific gravity is 2.3, below average for minerals. Vermiculite is chemically non-reactive, fire-resistant, odorless, and lightweight, which makes it suitable for uses like absorbing toxic liquids, animal bedding, and as a heat-resistant additive in concrete and ceramics.

Great Wall Mineral supplies vermiculite in multiple grades, with particle sizes ranging from 16 mm down to 0.5 mm, and densities between 3.5 and 10.0 kg/cu m, depending on the grade. The product is packaged in 100-liter bags measuring 110 cm by 70 cm. Buyers typically source this mineral for horticulture, industrial absorption, and construction applications, where its thermal insulation and moisture retention properties are valued. Custom grades tailored to specific requirements are available upon request.

Great Wall Mineral is based in Shijiazhuang, Hebei Province, China, at 282 North Zhonghua Street. The company specializes in supplying agricultural and industrial minerals, including vermiculite, and operates as an imported-tier supplier. Its profile indicates a focus on manufacturing vermiculite grades tailored to customer specifications, with the capability to produce non-standard sizes and densities upon request.

The supplier’s listing does not provide details on response rates, certifications, or production capacity. Buyers are advised to contact Great Wall Mineral directly for confirmation of lead times, minimum order quantities, and any additional technical specifications not explicitly listed. The company’s address and product range suggest a regional presence in northern China, with logistics likely centered around Shijiazhuang’s transport links.