About Us

A leader in the field of ship outfitting and insulation

The group’s broad expertise is reflected in the organization of the four individual companies providing comprehensive products and services for new buildings, maintenance and repair.
As a full service provider the Lethe group has the very best conditions for providing fast and smooth project management.

By making its own key equipment elements, Lethe reduces its dependence upon suppliers. This means fewer interfaces, no lost time and greater flexibility, so that each order is individually handled and tailor-made in line with customer wishes.

Solutions implemented by Lethe are a combination of all the major considerations – functionality and aesthetics, safety and comfort, cost-efficiency and environmental awareness.

Backing this up is a comprehensive portfolio of services – from planning to production, through to assembly and site management with having a quality management system in place to safeguard the group’s high standards. Lethe specialists are on hand with support at all stages whenever and wherever it is needed.

Products

Whether steel, stainless steel or aluminium: LETHE lines up a wide range of materials to be used. The company enjoys the benefits of in-house production capacities. In contrast to batch production, each production stage here is individually and flexibly adjusted to suit the requirements of the individual projects and products.

Experienced employees work hand in hand with the greatest care and a particular sense of responsibility. Their expertise allows for a high level of vertical range of manufacture which goes far beyond bending and welding.

The interaction with specially adapted control mechanisms ensures high quality standards and the best possible production results.

  • Manufacturing of in-house product ranges
  • Specially trained staff
  • Design according to specific customer requirements
  • High level of vertical integration
  • Broad range of materials
  • High degree of flexibility

All products are subject to continuous further development in order to comply with the applicable testing procedures and regulations at all times.


Fire Doors

LETHE fire doors, developed for use on board the modern mega yacht, not only comply with the fire protection requirements for classes BO through to A60, but also fulfil all requirements with regard to individual design possibilities or specific customer requirements.

LL-D2-A60 // LL-D3-A60

A0-A60 class non watertight single hinged door of, type designation LL-D2/D3-A60

  • SeeBG module B type approval no. 110.078/110.068 single hinged door with above mentioned type designation
  • Clear opening given for dimension in door frame, reduction by open door not taken into account with a maximum of COxCH 1020x2100mm. Individual dimensions according requirements
  • Weight of app. 120 kg/pcs. for a door with COxCH 950x2000mm and a noise reduction depending on the type of sill
  • Approx. 4mm gap between leaf and frame on three sides, 4mm at bottom
  • Door type D3 with the following optional equipment:
    • Round or rectangular shaped window with clear visible dimensions of max. 500x500mm
    • Cable loop for power supply of electrical components installed in the door leaf
    • Hoseport with clear visible dimensions according SOLAS regulations
  • 3 hinges per leaf, consisting of 3D adjustable receiver and heavy duty hinge. All visible items made of stainless steel type Simonswerke VN7748/100, cranked form, receiver and hinge to be matched together with a hinge length of 100mm
  • Brushed stainless steel surface design for door accessories such as hinges, lock shield, striking plate and sill cover (if applicable)
  • Door sensor proximity switch type “Bernstein” MA08 (three wire, signal closed only) on request

Installation frame

  • For installation in structure of ship by welded joint or screw connection
  • Surface finished with primer of type Integrad 269 red

Door frame

  • For installation in above-mentioned installation frame
  • Concealed sliding rail of type Dorma G96EMF without EMF unit and cable
  • Choice of three different sill types with variable heights
  • Surface painted in RAL or NCS colour shade according to demands
  • Flush-type striking plate made of stainless steel with bended lug
  • Sill cover (for sill type A and C only) made of stainless steel
  • Door gasket, colour corresponding to frame colour according requirements

Door leaf

  • Leaf pre-installed into door frame
  • Both sides covered by laminate of white colour or equivalent colour for leaf protection. Design of cover according requirements
  • Thickness of 52mm
  • Lock type Lethe-72/65-PZ, backset 65mm, made entirely of stainless steel, shield surface stamped “LETHE”
  • Holes for profile cylinder and handle, concealed door closer of type Dorma ITS96 3-6
  • Door leaf surrounded by painted or brushed stainless steel U-profile frame, frame angle straight with a length of 15-30mm or bent with a length of 13mm. Straight angle recommended in case of final leaf covering by the customer
  • Automatic door gasket of type Athmer 15/30 “Schall-ex” or “Ultra” on request

LYD-3plus-A60

A0-A60 class non watertight single hinged door, type designation LYD-3plus-A60

  • Single hinged, non-watertight interior A0-A60 class door with above mentioned type designation, SeeBG module B type approval no. 110.083
  • Clear opening (dimension in door frame, reduction by opened door not taken into account) with a maximum of COxCH 1050x2100mm. Individual dimensions according requirements
  • Since the door the requirements stated in MSC.1/Circ.1273 extended dimensions may be accepted for a specific project: max. CO: 1207mm; max. CH: 2415mm but the area of the leaf must not exceed approx. 2.60m²
  • App. 4mm gap between leaf and frame on three sides and of 6mm at bottom
  • 3 concealed hinges of type Tectus TE526, type 3D adjustable, alternatively 3 hinges, consisting of receiver and heavy duty hinge type Simonswerke VN7748/100 with cranked form, receiver and hinge to be matched together with a hinge length of 100mm
  • Brushed stainless steel surface design for door accessories such as hinges, lock shield, striking plate, rail and sill cover (if applicable)
  • Each hinge type (concealed / visible) available in an extended design to provide a solution for an additional decorative cladding on top of the hinge side of the door
  • Door sensor proximity switch type “Bernstein” MA08 (three wire, signal closed only) on request

Installation frame

  • For installation in structure of ship by screw connection
  • Surface finished with primer of type Integrad 269 red

Door frame

  • For installation into above-mentioned installation frame
  • Door frame for single gasket layer made of 0.75 mm galvanized sheet metal
  • Concealed sliding rail of type Dorma G96EMF without EMF unit and cable. Stainless steel cover plate as an option (for opening angles up to 90° only)
  • Choice of three different sill types with variable heights
  • Surface painted in RAL or NCS colour shade according to demands
  • Flush-type striking plate made of stainless steel with bended lug
  • Sill cover (for sill type A and C only) made of stainless steel
  • Door gasket, colour corresponding to frame colour according requirements

Door leaf

  • Leaf made of calcium silicate board, pre-installed into door frame
  • Both sides covered by laminate of white colour or equivalent colour for leaf protection (covering HPL, foil or special colour type on request)
  • Thickness of 52mm
  • Lock type Lethe-72/65-PZ, backset 65mm, made entirely of stainless steel, shield surface stamped “LETHE”
  • Holes for profile cylinder and handle, concealed door closer of type Dorma ITS96 3-6
  • Door leaf surrounded by painted or brushed stainless steel U-profile frame, frame angle straight with a length of 15-30mm or bent with a length of 13mm. Straight angle recommended in case of final leaf covering by the customer
  • Automatic door gasket of type Athmer 15/30 “Schall-ex” request

LL-DL1-A60

A0-A60 class non watertight double hinged door, type designation LL-DL1-A60

  • SeeBG module B type approval no. 110.063 double hinged door with above mentioned type designation
  • Clear opening given for dimension in door frame, reduction by opened door not taken into account with a maximum of COxCH 2200x2150mm. Individual dimensions according requirements
  • Weight of approx. 250 kg/pcs. for a door with COxCH 1900x2000mm and a noise reduction depending on the type of sill
  • Approx. 4mm gap between leaf and frame on three sides and of 4mm at bottom
  • 4 hinges per leaf, consisting of 3D adjustable receiver and heavy duty hinge. All visible items made of stainless steel type Simonswerke VN7748/100, cranked form, receiver and hinge to be matched together with a hinge length of 100mm
  • Brushed stainless steel surface design for door accessories such as hinges, lock shield, striking plate and sill cover (if applicable)
  • Door contact switch of type effeff 10405.10R on request

Installation frame

  • For installation in structure of ship by welded joint or screw connection
  • Surface finished with primer of type Integrad 269 red

Door frame

  • For installation into above-mentioned installation frame
  • Internal sliding rails of type Dorma (single leaf width of 650mm required)
  • Choice of three different sill types with variable heights
  • Surface painted in RAL or NCS colour shade according to demands
  • Sill cover (for sill type A and C only) made of stainless steel
  • Door gasket, colour corresponding to frame colour according requirements

Door leaf

  • Leaf pre-installed into door frame
  • Door leaves with both sides covered by laminate of white colour or equivalent colour for leaf protection. Design of cover according requirements
  • Thicknesses of 52mm
  • Inactive leaf equipped with bolt lock of type BKS 2390, active leaf with lock of type BKS 2329, both with panic function, shield 24mm, backset 65mm, complete made of stainless steel. Two additional locking points in door frame
  • Two internal concealed door closer of type Dorma ITS96 3-6 with mechanical door closing sequence control. A min. clear opening of 1200mm and a min. single door leaf dimension of 650mm is required
  • Opening of inactive locked door leaf in escape direction possible
  • Self locking of inactive door leaf by active leaf during closing sequence of both leaves
  • Holes for profile cylinder and handle
  • Door leaf surrounded by painted or brushed stainless steel U-profile frame, frame angle straight with a length of 15-30mm or bent with a length of 13mm. Straight angle recommended in case of final leaf covering by the customer
  • Automatic door gasket of type Athmer 15/30 “Schall-ex” on request

LM50-D2/D3-B15

B class non watertight hinged single hinged door, type designation LM50-D2-B15

  • Single hinged door with above mentioned type designation, SeeBG/DIFT approval no. 111.066/PC10273
  • Clear opening (dimension in door frame, reduction by opened door not taken into account) with a maximum of COxCH 900x2050mm. Individual dimensions according requirements
  • App. 4mm gap between leaf and frame on three sides and of 6mm at bottom
  • 3 hinges per leaf, consisting of 3D adjustable receiver and heavy duty hinge. All visible items made of stainless steel type Simonswerke VN7748/100, cranked form, receiver and hinge to be matched together with a hinge length of 100mm
  • Brushed stainless steel surface design for door accessories such as hinges, lock shield, striking plate and sill cover (if applicable)

Door frame

  • 5 different frame types for ideal connection to wall system available
  • Internal sliding rail type Dorma G96EMF without EMF unit and cable
  • Surface lacquered in RAL or NCS colour according to demands
  • Flush type striking plate of stainless steel with bended lug
  • Standard 20mm raised sill or flat sill of 5mm steel bar (cover profile of stainless steel for standard sill only)
  • Door gasket, colour type corresponding to frame

Door leaf

  • Leaf pre installed into door frame made of 0.75mm galvanized sheet metal
  • Door type D3 with the following optional equipment:
    • Overflow channel from bottom to top inside the leaf construction
  • Both leaf sides without decorative covering (covering HPL, foil or special colour type on request)
  • Thickness of 50mm
  • Lock type Lethe-72/65-PZ, backset 65mm, made entirely of stainless steel, shield surface stamped “LETHE”
  • Holes for profile cylinder and handle
  • Concealed door closer type Dorma ITS96 3-6 
  • Door leaf surrounded by painted or brushed stainless steel U-profile frame, frame angle straight with a length of 15-30mm or bended with a length of 13mm. Straight angle recommended in case of final leaf covering by the customer
  • Automatic door gasket type Athmer 15/30 “Schall-ex” or “Ultra” for noise reduction purpose on request

LYD-3plus-B15

B class non watertight single hinged door, type designation LYD-3plus-B15

  • Single hinged, non-watertight interior B/C class door with above mentioned type designation, DBI (Danish Institute of Fire and Security Technology) approval no. CMC10007
  • Clear opening (dimension in door frame, reduction by opened door not taken into account) with a maximum of COxCH 1000x2050mm. Individual dimensions according requirements
  • Since the door fulfils the requirements stated in MSC.1/Circ.1273 extended dimensions may be accepted for a specific project: max. CO: 1160mm; max. CH: 2367mm but the area of the leaf must not exceed 2.44m²
  • App. 4mm gap between leaf and frame on three sides and of 6mm at bottom
  • 3 hinges, consisting of receiver and heavy duty hinge type Simonswerke VN7748/100 with cranked form, receiver and hinge to be matched together with a hinge length of 100mm. Alternatively 2 or 3 concealed hinges of type Tectus TE526, quantity depending on type of frame. Both types 3D adjustable
  • Brushed stainless steel surface design for door accessories such as hinges, lock shield, striking plate, rail and sill cover (if applicable)
  • Each hinge type (concealed / visible) available in an extended design to provide a solution for an additional decorative cladding on top of the hinge side of the door

Door frame

  • Choice of door frame for single or double gasket layer in combination with five different frame geometries to ensure the ideal solution for the frame / wall connection in each case. All variations made of 0.75 mm galvanized sheet metal
  • Concealed sliding rail of type Dorma G96EMF without EMF unit. Stainless steel cover plate as an option
  • Surface painted in RAL or NCS colour shade according to demands
  • Flush type striking plate of stainless steel with bended lug
  • Standard 20mm raised sill or flat sill of 5mm steel bar (cover profile of stainless steel for standard sill only)
  • Door gasket, colour type corresponding to frame

Door leaf

  • Leaf pre-installed in door frame, made of galvanized or optionally of aluminium sheet metal to reduce system weight
  • Leaf in accordance with frame available for single or double gasket design
  • Both leaf sides without decorative covering (covering HPL, foil or special colour type on request)
  • Thickness ~51 mm (single gasket) / ~65 mm (double gasket)
  • Lock type Lethe-72/65-PZ, backset 65mm, made entirely of stainless steel, shield surface stamped “LETHE”
  • Holes for profile cylinder and handle
  • Concealed door closer type Dorma ITS96 3-6
  • Door leaf surrounded by painted or brushed stainless steel U-profile frame, frame angle straight with a length of 15-30mm or bended with a length of 13mm. Straight angle recommended in case of final leaf covering by the customer
  • Automatic door gasket type Athmer 15/30 “Schall-ex” for noise reduction purpose on request

Inspection flaps

As with the LETHE fire doors, the LETHE inspection flaps are available in a wide range of customisable models. Whether as a special design or as an addition to a LETHE panel system, the flaps can be modified both technically and visually.
Please contact us for further information.

LMxx-IDx-B15 (B class approved)

B class non watertight hinged hatch, type designation LM25-IDx-B15

  • Revision hatch, single hinged (ID1 / ID2 / ID4) or double hinged (ID3) door with above mentioned type designation, SeeBG approval no. 111.055, AS-10-01, 111.078 and 111.075 for direct installation in LM wall system (ID1 / ID2) or B class approved wall systems (ID3 / ID4) by use of counter frame
  • Clear opening (dimension in doorframe, reduction by opened door not taken into account) with a maximum of COxCH:
    • ID1: 550 x 1780 mm
    • ID4: 700 x 1800mm
    • ID3: 1400 x 1800mm
    • (single dimensions according requirements)
  • Frame with surrounding gasket; approx. 4mm gap between leaf and frame
  • Leaves consisting of half shells with mineral wool core, surface lacquered, PVC foil coated or without decorative surface. Special execution in stainless steel possible
  • Leaf thickness 30mm
  • All components made of mild steel or optionally of stainless steel
  • Locking by:
    • ID1 / ID2: turnbuckle / sash lock
    • ID3 / ID4: three point lock with shell-type handle
  • Hinges:
    • ID1: pivot
    • ID2 / ID3 / ID4: piano hinge

Panel Systems

The LETHE panel systems family includes solutions for a segmented wall and ceiling surface design. Our metal sandwich panels can be customised according to your weight-saving needs through the use of various surface layers made from aluminium or steel as well as through variation of the core materials of mineral wool, foam or aluminium honeycombs. The multitude of design possibilities for the outer surfaces as well as their availability as fully pre-segmented systems make our sandwich systems the perfect product for the interior fittings for vessels of any kind.

Wall system type LM

Interior wall panel-system of type designation LM

Description

  • Interior wall system of type LM with a total thickness of 25 or 50mm, a sound insulation factor of approx. Rw = 24 dB (as single bare wall) and a fire rating of at least B15. Designed with one (25mm) or two (50mm) decorative surface sides in PVC foil, painted sheet metal or without decorative surface as bare wall system
  • Sound insulation values for all systems were measured under test conditions. Final values depend on room and installation conditions
  • All panels, unless otherwise described, to be of sandwich type with a mineral wool core of 150kg/m³. Sheet metal covering to be optionally made of steel plates with a thickness of 0.70mm or aluminum with a thickness of 0.80mm. Special execution in stainless steel possible
  • Standard grid width of wall system to be 535mm single width and panel lengths up to 2500mm to be in accordance with specific room situation. ! The maximum panel length according latest valid certificates needs to be considered for B class divisions !

Standard accessories

  • Sill profile BP_D; 1.2 galvanized steel with holes, angles with different length (22/35) and anti vibration foam inlay
  • Wall support for single walls at a height of approx. 1,6m above floor level by galvanized U-profile type UK1-WS (approx. 1,5x15x50x15x2500mm) fixed to bulkheads by means of threaded bolts and rubber suspended hangers

Optional accessories

  • Sill type accoring demands
  • Grid work to design and manufacture panels in accordance with specific room situation incl. prefabricated inner and outer corner panels; preparation of required grid drawings for installation
  • Additional support layer according demands by galvanized U-profile type UK1-WS or aluminum U-profile type UK1-WA (both approx. 1,5x15x50x15x2500mm) fixed to bulkheads by means of threaded bolts and rubber suspended hangers
  • Connection profile (H profile) (CP for bare- / CPC for decorative wall)
  • Connection profiles for outer/innner corners with variable angle (ST1 / ST2)
  • Endprofile (END/RW) for bare systems; galvanized steel or bare aluminum
  • Connection profile for outer 90° corners (VB) for bare systems; galvanized steel or bare aluminum
  • Connection profile (UP1 / UP2) for T-joints
  • M8 threaded rods for wall support
  • Hanger for wall support of type Hilbig HG 40/25H 40 Shore, galvanized steel for 8mm bolts
  • Revision hatches with or without B class approval (for further information please refer to products/revision flaps)

Optional- / specal executions

  • Special coaming for wet room panels at the lower panel end to allow installation on wet room sill
  • Panel reinforcements (e.g. for installation of handrails)
  • Window and fire hose boxes
  • Honeycomb or foam core

Ceiling system type LM

Interior ceiling panel-system of type designation LM

Description

  • Interior ceiling system of type LM with a total thickness of 25mm and a fire rating of at least B15. Designed with one decorative surface sides in PVC foil, painted sheet metal or without decorative surface as bare ceiling system
  • All panels, unless otherwise described, to be of sandwich type with a mineral wool core of 150kg/m³. Sheet metal covering to be optionally made of steel plates with a thickness of 0.70mm or aluminum with a thickness of 0.80mm. Special execution in stainless steel possible
  • Standard grid width of wall system to be 535mm single width and panel lengths up to 2500mm to be in accordance with specific room situation. ! The maximum panel length according latest valid certificates needs to be considered for B class divisions !

Standard accessories

  • Wall to ceiling profile for PVC cover profile 28x40, galvanized steel; cover profile of PVC, various colors
  • Ceiling support profile type EP9, 1.5x25x60x25, galvanized steel

Optional accessories

  • Grid work to design and manufacture panels in accordance with specific room situation incl. prefabricated inner and outer corner panels; preparation of required grid drawings for installation
  • Substructure profile; aluminum 50/50x3mm; L=6000mm
  • Wall to ceiling connection profile (EP1 / 3 / 5 / 7); different executions
  • Ceiling to ceiling connection T profile (EP2 / 4 / 6 / 8); various executions
  • M8 threaded rods for wall support
  • Hanger for ceiling support of type Hilbig HG40/T, galvanized steel for 8mm bolts

Optional- / specal executions

  • Revision hatches with or without B class approval (for further information please refer to products/revision flaps)
  • Panel reinforcements
  • Honeycomb or foam core

Ceiling system (cassette-type) type LWC

Interior cassette-type ceiling system LM46-LWC-B15

  • Interior ceiling system of cassette-type, product designation LM46-LWC-B15, certificate no. 102.333 of See-Berufsgenossenschaft
  • Cassettes to be of 0.8mm steel sheet metal. Surface to be galvanized, foil-covered or lacquered in accordance with customers’ requirements. Special design in stainless steel or for coverings to be completed by customer in leather for example
  • Maximum dimension in accordance with module B certificate to be LxW: 2000x500mm, minimum dimension to be not less than 150x150mm
  • Core material to be mineral wool with a density not less than 220kg/m³. System to be covered by additional layer of mineral wool of 45kg/m³ for B15 purpose
  • C class execution with lower core density (150kg/m³), larger dimensions and without additional cover layer possible
  • Substructure of clamping profiles of galvanized steel (individual length to be 4000mm) in longitudinal as well as in transverse direction. Profiles connected by cross- (approx. 6pcs./m²), longitudinal- (approx. 4pcs/m²) and T-connectors (approx. 6pcs./m²). Amount and type of connectors to be in accordance with respective room situation
  • Quantity of hanger /threaded bolt combination connecting the profile grid to the ship structure in accordance with final weight of panel system. Standard amount of 5pcs./m². Hanger of type Hilbig HG40/T
  • Different ceiling profiles to connect wall and ceiling system available

Insulation

The LETHE product and service solutions include all insulating applications on board. The collaboration between in-house and external experts ensures that all applicable requirements are fulfilled as regards thermal, fire-resistant, acoustic, pipework and exhaust gas insulation. All areas, from construction through to fitting, are thus looked after and supported with our own products.
Please contact us for further information.

Wet Units

Many years of experience in the production and installation of wet units for mega yachts make LETHE a reliable partner today for the turnkey construction of a wide range of custom-designed wet unit solutions. The concepts, which are adapted for customer requirements and the construction process, are implemented by our experts from planning through to commissioning and continuous support is also provided.
Please contact us for further information.

Shore Power Solutions

Amended and new regulations and requirements valid both today and in the future call for reduced emissions by vessels while docked at the berth. A simple and cost-efficient possibility to comply with the guidelines is the use of shore connection systems. These require a failsafe flexible solution to bridge the vessel/shore interface. With the aim of addressing this issue we developed our containerized on-shore power supply systems, drawing on over ten years of experience that we have in this field to provide a variable and economically viable 6,6 kV (HVSC) system.

AmpCon40-MS

Containerized system for HV shore power connection
variable positioning over the entire width of the vessel

The AMPCon40-MS on-shore power supply system that is now available is the result of the consistent development and improvement as well as the optimization of all individual components. In this context, increased attention was paid to requirements from the market and to their systematic implementation. One example of this is the option to position the unit in the midship area as well as on the port or starboard side. This variability provides for compatibility with the majority of the vessels in a fleet. In addition, these features are supported by a robust cable guiding system with low maintenance requirements which can be used by the crew members to securely route a minimum of 55m of cable over the side of the vessel to the shore.
The optimized control system, which also ensures the tensioning function, in combination with the entirety of the components, allows for a “HV Shore Connection System (HVSC)” produced in accordance with international standards. By gaining the company ABB as a system partner, who has overall responsibility for the system, if requested by the customer, we are able to offer a complete package of container units and any necessary adaptations to the vessel.

System benefits - AMPCon40-MS

  • Variable positioning on board in midship, port or starboard positions
  • Equipped for use in all climate zones thanks to complete insulation and air drying
  • Robust cable guiding with low maintenance requirements
  • Minimum cable length of 55m
  • Easy and secure handling
  • Manufactured according to international standards (IEC/ISO/IEEE/80005-1)
  • Possibility of overall system responsibility by cooperation with ABB

Other products and special solutions

New guidelines, special technical requirements and a high degree of customisation for modern vessels lead us to constantly rethink our products. As a result, we always aim to pick up on customer requirements and wishes and transform them into special product solutions.

References

The LETHE Group customers include numerous well-known companies.

We treat the orders and projects of our customers with the utmost care and discretion. We therefore ask for your understanding that we do not name any customers or projects at this point.

We would be pleased to provide information on references on request as far as possible.

Contact

Main Office

LETHE GmbH

Seehafenstrasse 17
21079 Hamburg, Germany
Phone 0049/40/74 21 63–0
Fax 0049/40/74 21 63–220

info@lethe-hamburg.de
Map

International Agencies

Italy

TAIMAR R.I.E s.r.l.
Vicolo della Concordia 3/5
20021 Bollate (Mi) Italy
Phone 0039/02/38302720
Fax 0039/02/680 698
Mobile 0039/335/255 587

info@taimar.it
www.taimar.it
TAIMAR R.I.E s.r.l.

USA

Martel Marine Panels
108 Genesis Parkway
Thomasville, Georgia 31792 USA
Phone 001/229/226 2757
Fax 001/229/226 2652

info@martelmp.com
www.martelmarinepanels.com
Martel Marine Panels