Import Black Gravel — Buy in Bulk from Supplier in Indonesia

Black Gravel from CV Rainbow Pelangi is a naturally quarried volcanic stone originating from Indonesia, recognised for its deep charcoal to black colouration and angular fracture pattern. The material is screened to achieve consistent grading, with typical particle sizes ranging from 10 mm to 20 mm, though custom sizing is available upon negotiation. It is composed primarily of basaltic rock, giving it substantial density and resistance to mechanical breakdown under load-bearing conditions. The stone's naturally low porosity reduces moisture absorption, which limits freeze-thaw degradation in temperate climates. This listing positions the material for landscaping, construction fill, and decorative hardscaping projects where visual contrast and long-term stability are required.

The geological origin of Indonesian black gravel lies in volcanic deposits distributed across Java and surrounding archipelagos, where rapid cooling of lava flows produced fine-grained, dense basalt with minimal vesicularity. CV Rainbow Pelangi sources from quarries that mechanically crush and screen raw stone to specified fractions, though the exact quarry locations and processing methods are not detailed in the available data. Industry-standard processing includes primary jaw crushing, secondary cone or impact crushing, and vibratory screening to achieve uniform gradation. The absence of clay content and controlled fines percentage are critical for drainage applications, as excessive fines can clog permeable systems. Buyers should request sieve analysis data (ASTM C136 or equivalent) to verify gradation compliance with their project specifications.

Typical applications include decorative ground cover in commercial and residential landscapes, sub-base material for permeable paving, drainage layers behind retaining walls, and dark contrast elements in Japanese-style gardens and contemporary architectural settings. The material is purchased by landscape architects, civil engineering contractors, property developers, and horticultural suppliers. Trade terms mentioned in the source include FOB and CIF options, though specific port details, container capacities, and confirmed Incoterms must be negotiated directly with CV Rainbow Pelangi. The supplier indicates flexible minimum order quantities, but exact volumes, packaging formats (bulk bags versus loose bulk), and lead times are not specified and require direct confirmation.

CV Rainbow Pelangi is headquartered at Jl. Dr. Ir. Soekarno No 9 in Surabaya, East Java, Indonesia, a location that places it within Indonesia's second-largest city and a major logistics hub for Javanese exports. The supplier is classified as an imported-tier account with a harbor trust tier, indicating a baseline level of platform registration rather than extensive third-party verification. The response rate is recorded at 0.00% with an average response time of zero hours, which signals that the supplier has not yet established a track record of engagement through the platform's messaging system. This absence of response data is a material consideration for buyers evaluating communication reliability. The company's name suggests a focus on colour-sorted or decorative stone products, though this is not confirmed beyond the black gravel listing.

The supplier profile does not disclose founding date, employee count, annual turnover, production capacity, quarry ownership status, or major client references. No certifications (such as ISO 9001, environmental management, or quarry safety standards) are mentioned. Buyers should therefore conduct independent due diligence, including requesting company registration documents, quarry extraction licences, and references from prior export clients. The Surabaya address provides a starting point for verification, as the city hosts both manufacturing operations and trading houses that source from regional quarries. It remains unclear whether CV Rainbow Pelangi operates its own crushing and screening equipment or acts as an export intermediary; this distinction matters for quality control consistency and pricing structure.