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INDUSTRIES

Raised access floors

GAMMA industries France - 10/03/2009

Gamma INDUSTRIES

YOUR PARTNER
• The leader in France for raised access flooring.
A status obtained due to the quality of our installations.
• Prestigious references.
Gamma Industries has taken part in some of the most
outstanding projets in recent years.
• An experience recognized by all our customers.
• A total commitment from initial design,
through installation to final use.
• At every stage, dedicated personnel.
Issy les Moulineaux

Grande Arche and CNIT - La Défense

Cité des Sciences - La Villette

Summary

The guarantee of quality Page 3
The response to your needs Page 4
Accessories page 5
Detailed sketches Pages 6
Technical information Pages 7, 8
The families Page 9

CBX Tower
Gamma,
1

Raised
access floors

GAMMA INDUSTRIES has been designing,
manufacturing and installing raised access
floors from their origins.

We offer :

• Total commitment from initial design,
through installation to final use.

• A modern and efficient manufacturing
plant.

• The expertise of our teams.

the industrial dynamics
2

The guarantee of quality

The Quality Management System of GAMMA
INDUSTRIES is based on the International
Standard ISO 9001 (version 2000).
Strict controls at every stage of the production
enable to guarantee the required level of quality.

GAMMA INDUSTRIES has a reputation for
quality products and services. This level of quality
Quality is achieved due to a strict and methodic
Management organisation.
System
Quality policy and targets of GAMMA
INDUSTRIES are defined within our Quality
Assurance Guide.
Identification and tracability are the key words
of our system.
Quality control and final control

GAMMA INDUSTRIES can meet the criterias
of “Haute Qualité Environnementale” (HQE)
required by customers, due to :

• Selection of the raw materials used.

• Industrialization of our production processes.

• Mechanical and acoustic performances of
our products.

• Policy for reduction of our packing products
and industrial waste.

Laboratory and testing apparatus

Gamma, a realistic approach
3

The families
Offices
Raised floors with low finished height
OFFICE APPLICATIONS Trading rooms - call centers - casinos
Light computers rooms

Heavy computers
Technical rooms - telephone or
TECHNICAL APPLICATIONS network centers
Laboratories
Heavy loads - Important heights

Offices inside high buildings
RANGE M0 Technical rooms with M0 requirement
Offices with high acoustic performances

Scientific rooms
Special technical rooms
SPECIAL APPLICATIONS Clean rooms

Gamma, a wide selection
9

The response
to your needs
GAMMA INDUSTRIES has efficient technical and
sales departments ensuring the selection of the most
suitable raised floor to meet your requirements.
Headquarters

GAMMA INDUSTRIES
A wide range of products suitable to meet your requirements.
There is a family of panels to meet every requirement, and several panels to suit every room.

GAMMABOX M0
BUROBOX M0

GAMMACORE
GAMMABOX

GAMMAPAC
BUROBOX

BUROPAC

MINIGAM
ALUCAST
The families

GIM
OFFICE APPLICATIONS
Offices
Trading rooms - call centers - casinos
Light computers rooms

TECHNICAL APPLICATIONS
Heavy computers
Technical rooms - telephone or network centers
Laboratories
Heavy loads - Important heights

RANGE M0
Offices inside high buildings
Technical rooms with M0 requirement
Offices with high acoustic performances

SPECIAL APPLICATIONS
Scientific rooms
Special technical rooms
Clean rooms

GAMMA INDUSTRIES refers to the European Standard NF EN 12825 for all its tests
and controls.

4
Gamma INDUSTRIES


Burobox The Burobox panel is widely used in office buildings.
It can be covered with textile tiles used with access flooring,
free laid on site.

Composition
The Burobox panel is made up as follows :
• A high density resin bonded core, thickness 30 or 38 mm.
• A bottom tray of 0.5 mm thick galvanized steel turning
up the sides of the panel.

Coverings
The Burobox panel is available without covering.

Dimensions
Standard size : 600 mm.
Special size : 675 mm, for thickness 38 mm only.

Options
• Top varnished.
• Top plate of 0.5 mm thick galvanized steel.
• 19 mm thick core.

Fire classification
The Burobox panel is classed M1
(SNPE report n° 13149-07).

Electrical resistance
It varies from 5x108 to 2x1012 ohms, depending on the
properties of the covering.

Acoustic
The acoustic insulation measured between 2 adjacent rooms,
separated by a densely insulated partition, varies from 46 to
51 dBA, depending on the thickness of the panel and the
covering (Dn,f,w according to Standard EN ISO 140-12).

Load classes
Framework Class Certificate
NB : A system classed 1A is a system for
Burobox 30 Self-supporting 1A (or 2B or 3C) Nr. 03.10.30.07 which the ultimate load is at least 4kN
(load class 1).
Stringers 30/15 2A (or 3B or 4C) Nr. 03.10.30.04 The working load of this system is at least 2 kN,
with a safety factor of 2, for a deflection less
Burobox 38 Self-supporting 2A (or 4B or 5C) Nr. 04.11.17.02 than 2.5 mm (deflection class A).
Stringers 30/15 4A (or 5B or 6C) Nr. 04.11.17.01
See tables below for the other classes.
Survey Institute : SOCOTEC CONSULTING.

Load classes according to NF EN 12825 and using safety factor = 2.0.
Class 1 Class 2 Class Class 4 Class Class
Load class 1 2 3 4 5 6 Deflection class Maximum deflection
A (the most stringent) 2.5 mm
Ultimate load >4kN >6kN >8kN >9kN >10kN >12kN
B 3.0 mm
Working load >2kN >3kN >4kN >4.5kN >5kN >6kN C (the least stringent) 4.0 mm

Burobox Gamma INDUSTRIES


Buropac The Buropac panel has been specially designed for use in offi-
ces and computer rooms.
This panel is also recommended for rooms with non-magnetic
requirements. It is suitable for all the coverings used with access
flooring.

Composition
The Buropac panel is made up as follows :
• A high density resin bonded core, thickness 38 mm.
• A bottom aluminium foil.
• An ABS surround, heat bonded to the edge of the core.

Dimensions

Options
• Bottom plate of 0.2 mm thick aluminium.
• Top varnished.

Fire classification
The Buropac panel is classed M1


Acoustic
50 dBA, depending on the covering (Dn,f,w according to
Standard EN ISO 140-12).

Load classes

Framework Class Certificate NB : A system classed 1A is a system for
which the ultimate load is at least 4 kN
Buropac Self-supporting 1A (or 1B or 2C) Nr. 03.10.30.23 (load class 1).
with a safety factor of 2, for a deflection
less than 2.5 mm (deflection class A).


Ultimate load >4kN >6kN >8kN >9kN >10kN >12kN A (the most stringent) 2.5 mm
B 3.0 mm
Working load >2kN >3kN >4kN >4.5kN >5kN >6kN
C (the least stringent) 4.0 mm

Buropac Gamma INDUSTRIES


Gammabox The Gammabox panel has been specially designed to meet
the requirements of technical, data processing and scientific
applications.
It is suitable for all the coverings used with access flooring,
excepted textile and mineral coverings.

Composition
The Gammabox panel is made up as follows :
• A high density resin bonded core, thickness 30 or 38 mm.
• A bottom tray of 0.5 mm thick galvanized steel.
• A perimeter plastic edge trim slotted into the sides of the
panel.

Coverings
The Gammabox panel is available with the following
coverings :
• High pressure laminate • Linoleum
• Vinyl • Rubber

Dimensions

Fire classification
The Gammabox panel is classed M1


Acoustic
The acoustic insulation measured between 2 adjacent
rooms, separated by a densely insulated partition, varies
from 46 to 51 dBA, depending on the thickness of the
panel and the covering (Dn,f,w according to Standard EN
ISO 140-12).

Load classes

Gammabox 30 Self-supporting 1A (or 2B or 3C) Nr. 03.10.30.10 NB : A system classed 1A is a system for
which the ultimate load is at least 4kN
Stringers 30/15 2A (or 3B or 4C) Nr. 03.10.30.01 (load class 1).
5A (or 5B or 5C) Nr. 03.10.30.05 The working load of this system is at least 2 kN,
Stringers 45/15
Gammabox 38 Self-supporting 3A (or 5B or 5C) Nr. 04.11.17.03
Stringers 30/15 5A (or 6B or 6C) Nr. 04.11.17.04 See tables below for the other classes.


B 3.0 mm

Gammabox Gamma INDUSTRIES


Gammacore The Gammacore panel is famous on the world market for its
quality, design and finish.
It is characterized by an extruded aluminium edging inserted
into the core.
This panel has been designed to meet the requirements of
technical, data processing and scientific applications. It is suitable
for all the coverings used with access flooring, except textile
and mineral coverings.

Composition
The Gammacore panel is made up as follows :
• A high density resin bonded core, thickness 30 mm.
• A bottom plate of 0.5 mm thick galvanized steel.
• A peripheral extruded aluminium section inserted into
the core and holding the edge trim.
• A plastic edge trim slotted into the above mentioned
aluminium section.

Coverings
The Gammacore panel is available with the following
coverings :

Dimensions
Special sizes, on request.

Fire classification
The Gammacore panel is classed M1


Acoustic
separated by a densely insulated partition, varies from 46 to 51
dBA, depending on the covering (Dn,f,w according to
Standard EN ISO 140-12).

Load classes
Framework Class Certificate NB : A system classed 1A is a system for
which the ultimate load is at least 4 kN
Gammacore Self-supporting 1A (or 2B or 4C) Nr. 03.10.30.12 (load class1).
than 2.5 mm (deflection class A).


B 3.0 mm

Gammacore Gamma INDUSTRIES


Gammapac Gammapac panels are multipurpose panels designed to
meet a wide range of applications.
They are suitable for all coverings used with access flooring.

Composition
The Gammapac panel is made up as follows :
• A high density resin bonded core, thickness 30 mm or
38 mm.
• A bottom plate of 0.5 mm thick galvanized steel.
• An ABS surround, heat bonded to the edge of the core.

Coverings
The Gammapac panel is available with the following
coverings :
• Vinyl • Textile covering
• Rubber
Dimensions
Size 675 mm for thickness 38 mm.

Options
For panels without covering only :
• Top varnished.

Fire classification
The Gammapac panel is classed M1
The Gammapac panel, 38mm thick, is classed F30,
according to DIN 4102.

It varies from 5x105 to 2x1012 Ohms, depending on the

Acoustic
50 dBA, depending on the thickness of the panel and the
covering (Dn,f,w according to Standard EN ISO 140-12).

Load classes
Gammapac 30 Self-supporting 1A (or 1B or 2C) Nr. 03.10.30.08 NB : A system classed 2A is a system for
without covering which the ultimate load is at least 6kN
(load class 2).
The working load of this system is at least 3 kN,
Gammapac 30 Self-supporting 2A (or 2B or 3C) Nr. 03.10.30.11
with HPL covering
Stringers 30/15 2A (or 3B or 4C) Nr. 03.10.30.02 less than 2.5 mm (deflection class A).

Gammapac 38 Self-supporting 2A (or 4B or 5C) Nr. 03.07.10.06


B 3.0 mm

Gammapac Gamma INDUSTRIES


Burobox The Burobox M0 panel is widely used in office buildings.
M0
free laid on site.

Composition
The Burobox M0 panel is made up as follows :
• A mineral core, 19 to 30 mm thick.
If required, this core may be covered with galvanized
steel.

Coverings
The Burobox M0 panel is available without covering.

Dimensions
Special size : module 675 mm.

Options
• Bottom tray of 0.5 mm thick galvanized steel turning
up the sides of the panel.

Fire classification
The Burobox M0 panel is classed M0
(SNPE reports n° 1152-03 and 12215-05).

It varies from 5x10 8 to 2x10 12 ohms, depending on
the properties of the covering.

Acoustic
rooms, separated by a densely insulated partition,varies
from 49 to 54 dBA, depending on the thickness of the
panel and the covering (Dn,f,w according to Standard
EN ISO 140-12).

Load classes

Burobox M0 From 1 A à 3 A depending on thickness of the mineral and
(load class1).
steel plates used. The working load of this system is at least 2 kN,


B 3.0 mm

Burobox M0 Gamma INDUSTRIES


Gammapac M0

The family Gammapac M0 panels are multipurpose panels
designed to meet a wide range of applications.
They are widely used to suit access floors in High Rise
Buildings.

Composition
The Gammapac M0 panel is made up as follows :
A mineral core 30 mm thick.
A bottom 0.5mm thick galvanized steel plate.
A PVC/ABS surround heat bonded to the edge of the
mineral core.

Coverings
The Gammapac M0 panel is available with the following
coverings :
High Pressure Laminate
Vinyl or Linoleum
Carpet in free laid tiles
This panel may be supplied without covering.

Dimensions
Standard size : 600 mm

Options
For panels without covering only:
Top varnished

Fire classification
The Gammapac M0 panel is classed M0.

Electrical Résistance
Depending on the properties of the covering, it varies from
5.105 to 2.1012 ohms, measured with the covering.

Acoustic
The acoustic insulation measured between 2 adjacent rooms
54 dBA depending on the covering (Dn,f,w according to
Standard NF EN ISO 10848-2).

Load Classes
Framework Class Certificate NB : A system classed 1A is a system for which the
ultimate load is at least 4 kN (load class 1).
GAMMAPAC Self-supporting 1A (or 1B or 1C) Nr. 08.12.0205 The working load of this system is at least 2kN with a
M0 safety factor equal to 2, for a deflection less than 2.5mm
Stringers 30/15 2A (or 2B or 2C) Nr. 08.12.2205 (Deflection Class A).
Stringers 45/15 2A (or 2B or 2C) Nr. 08.12.3205

Load classes according to NF EN 12825 – Safety factor = 2
Load Class 1 2 3 4 5 6 Deflection Class Maximum
Deflection
Ultimate load > 4kN > 6kN > 8kN > 9kN > 10kN > 12kN A (the more stringent) 2.5 mm
Working load > 2kN > 3kN > 4kN > 4.5kN > 5kN > 6kN B 3.0 mm

Gammapac M0


Minigam The Minigam panel has been designed for offices where the
available height for access floors is limited.
The Minigam panel is classed M0 (incombustible), and is
characterized by a thickness of 19mm only.
free laid on site.

Composition
The Minigam panel is made up as follows :
• A mineral core 18 mm thick.
• A steel tray 0,5 mm thick.
• A top steel sheet 0,5 mm thick.

Coverings
The Minigam panel is available without covering.

Dimensions

Fire classification
Minigam panel is classed M0 (SNPE 11152-03).


Acoustic
rooms, separated by a densely insulated partition, varies
from 47 to 50 dBA, depending on the covering (Dn,f,w
according to Standard EN ISO 140-12).

Load classes

(load class 1).
Framework Class Certificate The working load of this system is at least 2 kN,
Minigam Self-supporting 1A (or 1B or 1C) Nr. 03.10.30.20 less than 2.5 mm (deflection class A).



B 3.0 mm

Minigam Gamma INDUSTRIES


Alucast Alucast is an aluminium die-cast panel of great strength.
Alucast is suitable for industrial and high-tech clean room
installations, and for rooms with non-magnetic requirements.
The panel is suitable for all the soft coverings normally used for
access flooring.

Composition
The Alucast aluminium is made up as follows :
• A top distributor plate, 3 mm thick.
• A double peripheral reinforced rib.
• A network of central ribs.
The monolithic conception of Alucast panels enables to
reach the levels of performance and accuracy required
for high-tech applications.

Coverings
The Alucast panel, plain or perforated, is available with
the following finishes :
• vinyl.
• rubber
Alucast PF2 : Perforated panel 11 % The Alucast grating (AF6) is available rough or epoxy
painted.

Dimensions

Fire classification
Without covering, the Alucast panel is classed M0
(incombustible), by nature.

Alucast PF4 : Perforated panel 22 %
Electrical Resistance

Range of perforations
• Alucast PF1 : Perforated panel, 7 % free area.
Alucast AF6 : Grating 60 %
• Alucast AF5 : Perforated panel, 40 % free area.
• Alucast AF6 : Grating, 60 % free area.
Load classes

Framework Class Certificate NB : A system classed 6A is a system for which
the ultimate load is at least 12 kN
Alucast plain panel Self-supporting 6A (or 6B or 6C) Nr. 03.10.30.13 (load class 6).
The working load of this system is at least 6kN,
Alucast PF4 (22%) Self-supporting 6A (or 6B or 6C) Nr. 03.10.30.14
than 2.5 mm (deflection class A).

See tables below for the other classes

B 3.0 mm

Alucast Gamma INDUSTRIES


Gim
The Gim Panel, made of a robust welded steel structure, is
designed for use in heavy duty industry : offshore platforms,
Navy, clean rooms, or machinery rooms.
It is suitable for all the coverings used with access flooring.

Composition
The Gim panel is made up as follows :
• A top distributor plate of 3 mm thick steel.
• A peripheral steel hollow section welded to the
distributor plate.
• Central steel bars welded to the distributor plate.
• A plastic edge fixed to the distributor plate.
All the visible surfaces of the Gim panel are painted.

Coverings
The Gim panel is available with the following coverings :

The Gim panel is also available without covering.

Dimensions

Fire classification
Without covering, the Gim panel is classed M0 (incombustible),
by nature.


Load classes
NB : A system classed 5B is a system for
Gim Self-supporting 5B Nr. 06.10.0905 which the ultimate load is at least 10 kN
Stringers 30/15 6C (load class 5).
Nr. 06.10.4917
The working load of this system is at least 5kN,
less than 3 mm (deflection class B).

B 3.0 mm

Gim Gamma INDUSTRIES


Pedestals
The pedestals are made up of :
• a square baseplate of galvanized steel.
• a steel galvanized column welded to the baseplate.
• a die-cast aluminium or steel head, according to the type of pedestal.
• a locking nut for height adjustment.

Standard pedestal
The head has a sufficient length to adjust the height + or - 20 mm.
Ridges moulded on the head allow a positive location of the panels.

Pedestal for low finished height
The threaded steel head allows an adjustment of + or - 7 mm.
The panels lay directly on a conductive pad. These pedestals allow a
minimum finished height of 70 mm.

Pedestal for great finished height (more than 800 mm)
The column is a square hollow section of galvanized steel.
The base, the head and the locking nut are the same as for the
Standard pedestal standard pedestal.

Installation
The pedestals are bonded to the concrete by way of a special
adhesive, or may be mechanically fixed.
A device on the baseplate permits a quick and safe fixing of the copper
earthing strap.

Pedestal low height Pedestal great height

Stringers Lockable stringers
They are made of galvanized steel . They are designed for location
on pedestal heads.
The stringers provide rigidity to the understructure, and stability
against lateral strain.
The depth of the section is adapted to the required performances :
• 30 mm deep : type 30/15.
• 45 mm deep : type 45/15.

Special stringers
When pedestals are omitted due to obstructions, i.e. electrical services,
Lockable stringer air ducting, etc., special bridging stringers may be used.
Within these particular areas, its is admitted that the deflection may
be 20% more than for the rest of the raised floor.

31bis, rue des Longs Prés 92100 Boulogne - Billancourt (France)
Gamma INDUSTRIES
Tel. : 33 (0)1 41 23 10 21 - Fax : 33 (0)1 41 23 10 01

Raised access floors www.gamma-industries.com


Detailed Gim-Pf
sketches The Gim-Pf panels allow air supply at any loca-
tion of the access floor.
These panels are entirely made of steel and
compatible with all other Gamma panels.

Riser Standard perimeter detail
Minimum width of perimeter cuts :
100mm

Loading performances
The load classes of the Gim-Pf panels are identical to
the classes of the panels they are mixed with.

Air flow Characteristics
Special perimeter detail Special perimeter detail
Minimum free height : 50mm Maximum void width : 60mm The total free area per panel is 8 dm2.
Optional adjustable sliding dampers can be fitted for
adjustment of the air flow.

The graph below shows the possible air flow according
to the air pressure in the plenum and the air pressure
drop according to the air flow.

100
With fully open damper
90
Overpressure in the plenum in Pa

80

70

60

50 Without damper

40

30

20

10
Dilatation joint Detail of profile over void along Flow m3/ h
Standard case facade 0
20
0
40
0
60
0
80
0 00 200 00 00 00 00 00
10 1 14 16 18 20 22
Void greater than 60mm
0 1 2 3 4 5 6 7
Free section airspeed in m/s

6
Gamma INDUSTRIES


Accessories

Ramps Steps and risers
The ramps are generally made of a wooden Steps and risers are made of white melamine
frame, and finished with a black anti-slip boards and their top edging is finished with
rubber. an anti-slip aluminium nosing.
The junction between the ramp and the The steps are covered with an anti-slip rubber
access floor is a metallic profile. The ramp covering.
nosing is made of an aluminium profile.
The recommended slope of a ramp is 5%,
with a maximum of 10%.
Handling of loads on the ramps must be
made with appropriate means, under the
responsability of the user.

Installation with stringers Bridging profiles
For this type of installation, panels lay on Bridging profiles are used when a raised
metallic stringers. Stringers are used : floor must be installed over ducts, channels,
conduits, or holes of large sizes.
• For finished heights greater than 500mm.
• For raised floors which are not surrounded These bridging profiles enable to suppress
by walls, or which have to take loads with one or several pedestals.
frequent removals.
• For important point loads or distributed
loads.
• For raised floors including a large number
of cut-outs.

Plenum dividers Coverings
When required by regulations, plenum Some of our panels are suitable for the
dividers made of non combustible materials following coverings :
can be supplied.
High pressure laminate
Vinyl
Linoleum
Textile
Rubber
Wood
Some others are available without covering.
They can be covered with textile tiles used
with access flooring, free laid on site.

Panel lifting device Outlets, type brush or type PVC

Gamma, an easy technology
5

Technical information
Requirements for rooms to be installed with access floors (DTU 57-1)
• Rooms must not be exposed to bad weather.
• Rooms must be equipped with outside glazing.
• Concrete slab and plaster walls must be dry.
• Concrete slab must be conform to article 5.2.2 of DTU 21: the raw concrete is not allowed. The upper part of the concrete must resist when trying
to tear up manually a pedestal base bonded to the concrete. The concrete must be able to take the weight of the raised floor and the loads
transmitted by the pedestals bases.
• Rooms must not be encumbered with materials or tools and get a dry and clean concrete.
• Rooms must be free of any of the other trade during installation.
• All rooms adjacent to the access floor must have the same floor height.
• The ambient temperature of the rooms where the access floor is to be installed should be kept between 5°C and 24°C and the relative humidity
between 45% and 70 %. If the temperature is above 24°C (but never above 30°C) the relative humidity should not be over 50%. The subfloor
temperature should not be below 5°C.
• No water or any other liquid should be spread under or on top of the access floor.
• No other trade is allowed to walk on the raised floor during its installation, for at least 48 hours.

Installation
• The required finished level of the raised floor must be materialized by the architect or the building owner. The location of the first panel to be
installed is determined by the drawings, in such a way that the width of the panels cut along the walls will be more than 100 mm, providing a
good stability.
• Handling and installation of any equipment or heavy material must be done on an added boarded flooring or load-spreading plates, rigid enough
to spread the loads, to prevent overloading, tearing or scratching of the floor covering.

Coverings
Coverings to be used
• High pressure laminates : these coverings must not be used within rooms where abrasive dust may lay on the floor.
• Soft coverings : vinyl, rubber or linoleum.
• Textile coverings : needlepunch carpets, cut-piles carpets.
• Parquets, mineral coverings and ceramics : the technical characteristics of these coverings must be checked carefully in order to determine if they
can be used with raised floors.

Suitability of coverings
High pressure laminates must be conform to Standard NF EN 438, NF EN 685 and NF EN 14041.
The resilient floor coverings used with raised floors must be classed minimum 32 according to the classification of the Standard NF EN 685.
Textile coverings to be used with raised floors must be classed 3 or 4 according to the classification of Standards NF EN 1470 or NF EN 1307,
according to the type of covering.
The design of the covering must not require any joint or centering, and tiles of covering must be interchangeable.

Factory bonded coverings
Floor coverings with a foam backing must be excluded.

Free laid coverings
It concerns carpets tiles, free laid on site. Their dimensions, squareness, stability and installation must be conform to the requirements of the Standard
NFP 62.202.1 (reference DTU 53.1).
The use of a permanent adhesive between the raised floor and the carpet tiles must not make dismantling of the raised floor panels difficult. It is
recommended not to aline carpet tiles and raised floor panels.

Maintenance
Excessive use of liquid products must be avoided.
The use of water can provoke swelling, oxidizing or destruction of the components of the panels.
Cleaning products can damage the adhesives on the edges and corners. Even small quantities of a product can laminate the covering.
Every covering has a data sheet for maintenance.

Gamma, total safety
7

Technical information

Mechanical performances and loading

A raised floor must be designed and produced in such a way to ensure the required mechanical resistance and stability. The required wor-
king load must not cause deformation or failure of the raised floor.
All systems must be tested according to requirements of the Standard NF EN 12825, and classifcations obtained after these tests
must be certified by an official test report from an independant body.

Acoustic insulation
When tested according to Standard EN ISO 140-12, our access floors can reach airborne sound insulation values from 44 to 54 dbA.
The insulation to impact sound depends mainly on the type of coverings bonded on the panels. The textile coverings are the most
efficient.

Fire protection
The regulations for access flooring refer to :
• the reaction to fire
• the partitioning of the plenum
• the calorific potential
They vary according to the use of the rooms and the classification of the building inside which the access floors are installed.

Reaction to fire
In France, the Decree dated June 30 th, 1983 defines 5 classes for the materials : M0, M1, M2, M3, M4.
The test method used is the radiation test. The tested side is the bottom of the panel.
The classification of the superior part of the panel is the same as for the covering.

Partitioning of the plenum
When required by regulation, plenum dividers made of non combustible materials can be supplied.
Every partitioned area has a maximum surface of 300m2 and a maximum length of 30 meters. In case of fire, the partitioning limits
the air circulation inside the plenum.

Electrostatic properties
The ability of a covering to accumulate electrostatic loads, and its ability to eliminate these loads are essential for the antistatic properties of an
access floor. The measurement of the transversal resistivity (Ret) enables the estimation of the ability to eliminate electrostatic loads.
Coverings are classed according to NF P 62.001 (Resilient floor coverings - Electrostatic behaviour) :

Class 1 : Astatic covering : RET > 1.109 (ohms) and electrostatic charging potential < 2 KV.
7
Class 2 : Dissipative covering : 1.10 < RET < 1.109 (ohms) and electrostatic charging potential < 2 KV.
7
Class 3 : Conductive covering : RET < 1.10 (ohms) and electrostatic charging potential < 2 KV.

All raised floors must have a transversal resitivity between 5.105 and 2.1012 ohms.

The equipotential connection is made by a copper strap network connecting certain pedestals to each other. This network is earthed by the
companies in charge of the electrical wiring.

8
Gamma INDUSTRIES


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