Seal Information

Lorient, Raven, Seals, Intumescent, twin seal, DS seal, Drop seals, Acoustic


aving lives and preserving property - Lorient design and manufacture market-leading, high-performance door sealing systems; the only seal manufacturer with BBA accreditation. In excess of 35 years' experience, there's not much Lorient doesn’t know about door sealing.  Respected throughout the industry for technical depth, quality and service, they play an active role in helping to shape standards and best practice.  Lorient share their knowledge openly with us and can support our product development in their own research laboratory.

Integrated systems

Ensuring a fire door set provides complete protection involves more than one element alone. That’s why we choose to partner with Lorient where we can offer a suite of products. Principal Doorsets can recommend the most efficient, cost-effective combinations for every situation. Intumescent seals are a vital part of a fire door assembly, helping to defend buildings against the spread of fire. Lorient smoke seals combined with our door sets restrict smoke movement around a building - giving people time to escape, and reducing property damage..

Improving quality of life every day

Not only for addressing fire performance Lorient seals and Principal Doorsets still work hard every day to enhance a building’s performance and look. Along with our doors acoustic seals help to contain sound within a room, or prevent it entering. Many of our doorset combinations also improve the building’s energy efficiency by keeping in heat.  Sealing systems are designed so the door can be used with minimal effort, helping those with reduced mobility or jobs where the use of a door is high.


The dedicated Testing & Technical Services Centre at Discovery House in Devon hosts:

  • a state-of-the-art, purpose-built acoustic transmission suite;
  • an indicative fire test furnace;
  • many cycling rigs;
  • air and smoke leakage testing equipment;
  • environmental chambers;
  • an analytical laboratory.

With Lorient UK manufacturing site on our doorstep in Devon, and with our many years of working with Lorient product and team, a strong relationship has developed. We have our own and Lorients technical competence on hand to assist in specialist areas should that be necessary. 

Principal Doorsets chose to provide Lorient products because of their longstanding customer service, quality, technical capability and portfolio of products