BLM Lead

"Only BLM Rolled Lead Sheets meet the British Standard BS EN 12588 for thickness, quality and consistency. The rolling process involves passing slabs of Lead back and forth between high pressured rollers. The process is computer controlled to consistently obtain a precise predetermined thickness and knitted grain structure, allowing the performance of the sheet to be accurately predicted whilst in place. Lead is produced to 6 standard Code thicknesses, The Code numbers were derived from the imperial weight of Lead measuring 1 square foot. For example, Code 3 weighed 3lb per square foot."