Fused quartz is the only material that can comfortably hold a flame hot enough to make more fused quartz. That paradox sits at the heart of the oxyhydrogen burner, the quiet workhorse behind synthetic silica, optical fibre preforms, and the glassblower’s lampwork bench. Quartz glass (amorphous SiO2) earns the job through a rare stack of properties: - Softening point near 1660C, far above the 1085C melting point of the copper used in conventional torch tips - Coefficient of thermal expansion around 0.55 ppm/K, roughly a sixth that of borosilicate and a sixteenth that of window glass, so the burner shrugs off the thermal shock of repeated ignition - Transparency from deep UV through near IR, letting radiant heat pass through rather than soak into the nozzle - Chemical inertness against the hydrogen chloride and silicon halides that corrode metal tips The burner premixes hydrogen and oxygen at the tip through a set of concentric drawn-quartz tubes, producing a near-colourless flame aro...