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Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill is a post-medieval nitrating house built upon Dinantian limestone bedrock in south Wales. The facility was constructed to manufacture nitro-glycerine, a highly explosive compound essential for naval propellant production. The choice of location on limestone geology reflects the practical requirements of the site, as the underlying rock provided both structural stability and natural drainage properties valuable for industrial chemical works of this period.
The structure exemplifies the scale and specialisation of British munitions manufacturing during the modern era, when the Royal Navy's demands for reliable propellants drove investment in dedicated industrial facilities. Such nitrating houses required careful isolation from other works and settlements due to the inherent dangers of explosive manufacturing. The site operated within the broader context of naval modernisation and the development of sophisticated weapons systems.
Today the monument remains protected by Cadw, the Welsh heritage monuments authority, under reference MM352, preserving evidence of Wales's role in British industrial and military production. The surviving structure documents the technological infrastructure upon which nineteenth and twentieth-century naval power depended, positioned within the industrial landscape of south Wales alongside contemporary works and transportation networks that served the broader defence establishment.
Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill is a scheduled monument protected by Cadw under reference MM352. View the official record →
Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill is a post-medieval nitrating house built upon Dinantian limestone bedrock in south Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MM352.
Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill dates from the post medieval/modern period, and is classified as a nitrating house. It is one of over 32,000 scheduled monuments protected across the UK.
Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is MM352.
Several scheduled monuments lie within 10 km, including Caldicot Castle (unoccupied parts) (3.1 km), St. Mary's Churchyard Cross, Portskewett (3.7 km), Harold's House (site of) (3.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.