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Field-proven thermite consumables and precision measuring accessories designed for strict compliance with AS/NZS rail track maintenance and continuous welded rail (CWR) protocols.
New Zealand's railway network, operated under KiwiRail and integrating key urban transport links like the Auckland City Rail Link (CRL) and the Wellington Metro Network, spans more than 4,000 kilometers of narrow-gauge (1,067mm) track running across rugged mountain passes, coastal plains, and geologically active terrain. Maintaining rail integrity in this unique environment demands strict adherence to geometric tolerances and advanced welding measuring tools.
As major export corridors—including the high-tonnage forestry routes in the Central North Island and primary dairy logistics lines from the Waikato to the Port of Tauranga—experience heavier axle loads, aluminothermic (thermite) weld quality is paramount. A single millimeter discrepancy in rail gap spacing, vertical alignment, or horizontal crown profiling can lead to accelerated rail corrugation, rolling contact fatigue (RCF), and premature track degradation.
RMTS bridges this precision gap by supplying China-manufactured, precision-engineered welding measuring tools, alignment straightedges, weld gap gauges, and high-purity thermite welding consumables tailored to New Zealand's environmental conditions and AS/NZS rail engineering standards.
Precision alignment tools maintain the mandatory 26±2mm weld gap standard to ensure uniform preheating and defect-free molten metal fusion.
Engineered to withstand NZ's seismic activity and thermal variations, preventing joint fracture in both North and South Island networks.
Consumables and measuring instruments are calibrated to exceed Australasian mechanical strength and metallographic testing criteria.
A world-class manufacturing facility delivering end-to-end thermit welding solutions, digital measuring devices, and specialized field engineering support worldwide.
RMTS is a manufacturer specializing in railroad thermit welding materials, based in Tianjin, China. With a modern factory spanning 5,500+㎡ and 30+ dedicated professionals, we are committed to delivering reliable and efficient thermit welding solutions to clients across the globe. Our products are designed to meet the highest industry standards, ensuring durability and performance in various applications.
We understand that successful welding projects require not only high quality products but also expertise and knowledge. That’s why we offer comprehensive on-site training programs to help our clients master the thermit welding process, enabling them to achieve optimal results and build a strong reputation in their respective fields. Additionally, our experienced team provides project welding instruction services, offering hands-on guidance and support to ensure seamless execution, no matter where the project is located.
Driven by a customer-centric approach, RMTS is dedicated to fostering long-term partnerships by delivering exceptional products and services tailored to the unique needs of our clients. Whether you are looking for reliable thermit welding materials, expert training, or project support, RMTS is your trusted partner in achieving welding excellence across New Zealand and the Asia-Pacific region.
How high-accuracy measurement instruments eliminate track geometry faults, maintain rail tension balance, and ensure smooth passenger and freight transit.
Prior to igniting the aluminothermic charge, rail ends must be cut square and spaced at exactly 26±2mm. Precision stepped gap gauges and rail bevel measuring squares verify that flame distribution and preheating airflow remain uniform across the entire rail section, preventing cold laps or excess flash.
During cooling, thermit steel shrinks. Track welders employ 1-meter precision straightedges paired with micrometric feeler wedges to set an upward peaking crown of +1.0mm to +1.8mm. This intentional crowning compensates for thermal contraction, guaranteeing a perfectly flat running surface post-cooling.
Following hydraulic shearing and profile grinding, digital weld straightness gauges inspect the rail running edge and crown profile. Tolerances must stay within +0.2mm / -0.0mm over a 1m chord to eliminate wheel impact vibration and protect New Zealand locomotives from high-frequency dynamic stress.
Driven by relentless innovation, RMTS combines metallurgical science with real-world track testing to deliver thermit welding systems that exceed international specifications.
RMTS has a highly skilled R&D team that works tirelessly to ensure that we produce thermit welding materials that meet the specific needs of each type of rail, including 50kg/m, 68kg/m, and AS 1085 specifications.
In addition to its strong R&D capabilities, RMTS actively participates in railway projects across China and abroad. The company collaborates with railway authorities, construction companies, and maintenance organizations to provide its expertise and materials.
By participating in railway projects, RMTS contributes to the development and maintenance of China's extensive railway network. Whether in high-speed rail, urban transit systems, or conventional lines, RMTS ensures the integrity and safety of rail infrastructure.
Furthermore, RMTS maintains partnerships with research institutions, universities, and industry experts in China. These collaborations enable RMTS to continually strengthen its R&D capabilities in advanced thermit welding technologies.
Advanced crucible systems engineered to withstand reaction temperatures over 2,500°C while ensuring pristine metallurgical cleanliness and precise slag separation.
Our single-use refractory one-shot crucible provides unmatched convenience for high-tempo maintenance windows on busy commuter lines like Auckland and Wellington. Pre-fitted with an automatic self-tapping thimble, it eliminates manual tapping errors, guarantees uniform pouring temperatures, and eliminates crucible preheating requirements.
Engineered with premium magnesia-spinel multi-layer lining, RMTS reusable long-life crucibles yield up to 50–80 repetitive pours in heavy-duty depot applications or dedicated port track installations. Designed for maximum thermal shock resistance and minimal thermal loss during large batch welds.
Thermit portion, sand mould, luting sand, and high-temperature ignitors represent the core consumables for aluminothermic joining. Standard Rule: 1 weld requires 1 complete consumables kit.
From deep-water container terminal crane rails to suburban light rail and heavy mountain freight, RMTS products offer robust structural stability.
Connecting North & South Island freight arteries with high-tensile, crack-resistant continuous welded rail joints.
Heavy-duty QU70/QU100/QU120 profile joining for automated ship-to-shore gantry cranes at major intermodal yards.
Low-noise, vibration-damped joints for high-density commuter networks in Auckland, Wellington, and urban transit.
Corrosion-resistant thermite formulations built to withstand maritime salt spray at Port of Tauranga and Lyttelton.
Extreme yield strength compositions engineered to sustain heavy 25+ tonne axle loads on critical bulk commodity lines.
RMTS is a passionate and progressive aluminothermic welding manufacturing company providing full-lifecycle procedural documentation.
Aluminum thermite welding, also known as aluminothermic welding or thermit welding, is a specialized welding technique that utilizes an exothermic chemical reaction between iron oxides and aluminum powder to generate intense superheated molten steel (approx. 2,500°C) for joining rail components permanently into smooth continuous track.
Preparation Step 1: Ensure the rail ends to be welded are thoroughly clean, free from scale, rust, and moisture, and properly aligned using precision straightedges. The gap size (the space between the two rail ends to be welded) must be precisely adjusted to 26±2mm before securing mould clamps and applying luting sand sealing.
Moisture Warning: Thermit welding materials will fail if exposed to water or high humidity. All portions, luting sands, and moulds must be stored in dry, weatherproof containers, completely isolated from ambient dampness during transport across New Zealand ports and during on-track staging.
We offer a complete range of thermit welding materials, including specialized welding kits, precision sand moulds, one shot and long life crucibles, luting sand, and electronic ignitors—ensuring consistent batch-to-batch quality, minimal downtime, and complete track security.
Heavy-duty hydraulic and internal combustion equipment complementing our measuring gauges for complete track maintenance.
High-efficiency torque tightening for rail clips and fasteners.
Rapid surface derusting prior to gap alignment and preheating.
Accurate hole positioning for fishplates and electrical bonding.
Field-portable gasoline drill for isolated remote branch lines.
Precise CWR stress equalization and neutral temperature setting.
Dual-cylinder hydraulic cutter for clean, excess hot weld removal.
Smooth, perpendicular rail end cuts to eliminate joint gap bias.
Precision finish grinding of welded joint crowns to AS/NZS limits.
Restoring head curvature and gauge corner radii after welding.
Specialized turnout and frog maintenance grinder for complex junctions.
High-speed abrasive disc saw for rapid track cut-ins during possessions.
Heavy force generation for alignment clamping and rail repositioning.
Absorbs reaction shock loads during heavy rail pulling operations.
Fine gap widening and closing tool for exact weld gap dimensioning.
Corrects horizontal and vertical dip angles in fishplated and welded joints.
Heavy tonnage horizontal straightening for high-strength 60kg rails.
Dual-action hydraulic tensioner for de-stressing long rail segments.
Ballast tamping around newly welded joints to stabilize track bed foundation.
High-frequency ballast consolidation beneath sleepers at weld junctions.
Explore our premier line of rail consumables, mould accessories, and crucibles trusted by rail contractors across Oceania.
Ultra-pure aluminothermic formulation with micro-alloyed vanadium and manganese for enhanced rail joint fatigue resistance.
High-density quartz refractory sand mould pre-formed for 50kg/m, 68kg/m, and NZ narrow-gauge rail profiles.
Disposable refractory crucible with self-tapping mechanism, guaranteeing exact casting temperature and operator safety.
High-plasticity sealant paste preventing molten steel leakage along rail web and foot contours during thermite casting.
Heavy refractory cover containing reaction sparks and directing venting gasses safely away from track personnel.
Heavy-duty alloy steel clamping frames ensuring uniform sealing pressure across sand mould halves without cracking.
Moisture-resistant electronic & pyrotechnic ignitors guaranteeing rapid 100% reaction ignition in damp NZ coastal climates.
Reinforced molten slag catch basin preventing burning of track sleepers, ballast, and trackside signaling cables.
Key considerations on tolerances, international freight logistics, custom profile tooling, and track safety standards.
Our measuring instruments, straightedges, feeler wedges, and stepped gap gauges are manufactured under ISO 9001 certified quality systems and calibrated to sub-millimeter tolerances (±0.05mm). They are specifically configured for Australian and New Zealand rail head geometries (including 50kg, 60kg, and AS rail types), ensuring accurate peak crown measurement, running edge alignment, and gap uniformity.
Standard thermite welding practice requires a rail end gap of 26±2mm with cut ends perpendicular within 1mm. Prior to pouring, an upward peaking crown of +1.0mm to +1.8mm is established using alignment straightedges. Following final profile grinding, the finished vertical running surface tolerance must remain within +0.2mm / -0.0mm over a 1-meter span.
Yes. In addition to standard UIC and AS profiles, our Tianjin R&D facility engineers custom CNC tooling and refractory sand moulds for legacy 35kg, 40kg, and 45kg rail sections still operating on heritage lines, timber tramways, or specialized industrial sidings across the North and South Islands.
All aluminothermic powders, ignitors, and luting sands are vacuum-sealed in multi-layer moisture-barrier foil bags, packed inside shockproof outer cartons, and consolidated in desiccated, hermetically sealed maritime containers. This packaging ensures total dryness and reactivity upon arrival at Ports of Auckland, Tauranga, or Lyttelton.