Bitumen in New Zealand

New Zealand maintains a well-developed road network spanning over 94,000 kilometres across the North and South Islands, managed by the New Zealand Transport Agency Waka Kotahi and local councils. The country's infrastructure investment programme, underpinned by the National Land Transport Programme (NLTP) and the Roads of National Significance (RoNS) initiative, drives consistent demand for high-quality, performance-assured bitumen grades. New Zealand's diverse climate — from the warm, humid conditions of Northland and Auckland to the cold alpine environments of the South Island's Southern Alps and Central Otago — demands bitumen products with a broad temperature performance range. Black Rock Bitumen supplies certified bitumen grades to New Zealand contractors, distributors, and project owners.

Bitumen Applications in New Zealand

Bitumen is used across a wide range of infrastructure and construction applications in New Zealand, including:

• State Highway and motorway construction and rehabilitation managed by NZTA Waka Kotahi
• Local road maintenance and resurfacing across all territorial authorities
• Auckland Motorway Alliance and Wellington Northern Corridor road projects
• Auckland, Wellington, and Christchurch International Airport runway and taxiway maintenance
• Port of Auckland, Lyttelton Port, and Port of Tauranga terminal paving
• Bridge deck waterproofing and structural protection
• Residential subdivision and urban road construction
• Industrial estate and logistics facility paving
• Commercial and residential roofing and modified bitumen waterproofing membrane systems
• Railway formation and embankment protection

Our bitumen products are formulated to perform across New Zealand's varied conditions, delivering excellent low-temperature flexibility for South Island alpine roads, moisture resistance for wet West Coast conditions, and adequate high-temperature resistance for Auckland's warmer summers.

Bitumen Grades Supplied to New Zealand

Black Rock Bitumen supplies a full range of certified bitumen grades for New Zealand projects:

• Penetration Grade Bitumen — 40/50, 60/70, 80/100, 100/150 (ASTM & EN standards)
• Performance Grade (PG) Bitumen — PG 58-22, PG 64-22, PG 70-22, PG 58-28 for New Zealand's climate range
• Polymer Modified Bitumen (PMB) — A15E, A20F grades per Austroads/NZS specifications for high-stress pavements
• Multigrade Bitumen — For wide temperature performance across North and South Island conditions
• Oxidized (Blown) Bitumen — For roofing, waterproofing membranes, and industrial applications
• Bitumen Emulsion — Cationic grades for sprayed chip sealing, prime coat, and tack coat
• Cutback Bitumen — For low-volume road priming applications

All grades comply with ASTM, EN, AASHTO, and NZS/Austroads standards, meeting the specifications of NZTA Waka Kotahi and New Zealand territorial authority roading requirements.