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Furukawa Fire Limit Lead-Through Treatments to Meet
Varied Needs

1.

INTRODUCTION

The structures that people use for their activities must be
supplied with the electricity, gas, water and other services
required for manufacturing and daily life. The means used
for their supply are wires, cables and pipes (hereinafterreferred to as “cables, etc.” for short), but they are notalways made of non-combustible materials. In order that,when fire breaks out inside a structure, the cables, etc. donot act as a route for its spread and cause greater damage to the occupants or the structure itself, the BuildingStandards Law provides for the designation of “fire limits”.
Further, when the cables, etc. pass through fire limits, it isnecessary that the construction specifications and theirfire-resistant properties be confirmed to be those certified
by the responsible authorities. (In Japan, BuildingStandards Law Enforcement Ordinances, Article 129-2-5,Section 1, Paragraph 7).
Since the cables, etc. that are laid in structures passthrough the fire limits via a variety of routes, the positionand configuration of lead-throughs are also dissimilar.
Since the safety of occupants and structure cannot be
assured unless appropriate measures can be taken withrespect to these various lead-throughs, it is important thatfire protection measures at lead-throughs use the simplest structures and the easiest construction techniques.
Here we would like to bring to your attention some products that achieve this: ROKUMARU, ICHIJIKAN fire-resistant packs, and ICHIJIKAN HOLD.

2.

requires a high level of expertise, to a technique involving
the packing of fire-resistant blocks, which can be done byanyone, it has been possible to shorten the working time,
and to assure that restoring lead-throughs during the renovations that have become increasingly frequent in recentyears is easier and more reliable.
2.1 Features(1) ROKUMARU is a highly flexible construction technique involving filling with fire-resistant blocks, which
can be used at lead-throughs by electric wires,cables, bus ducts, as well as the electrical conduitsthat can also be made of plastics.
(2) Since it does not use power tools and is a clean
method that does not produce dust, it has no adverse
impact on the working environment.
(3) In order to suit the various lead-through configurations and lead-through materials, the product consists of combinations of fire-resistant blocks of fivesizes (SS, S, M, L and LL) for a kit.
(4) To accommodate additional wiring during building
renovations, fire-resistant blocks can be removed,and easily replaced once the new wiring is installed.

ROKUMARU

By changing from the putty and fireproof board technique
now in general use, which is a specialized technique that

Fire-protection measures taken

Cables, etc.

Figure 1

Fire-protection measures not taken

Walls and ﬂoors of ﬁre limit

Conceptualization of fire-protection measures.

Figure 2

ROKUMARU kits.

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200769Furukawa Fire Limit Lead-Through Treatments to Meet Varied Needs

2.2 Fire-Resistant Properties
As a result of its ceramic-based heat-insulating properties
and heat expanding properties, ROKUMARU has passed
legally established flammability tests, and with respect tovarious wall and floor lead-throughs for cables, bus ducts
etc., it has obtained certification by Japan’s Minister ofLand, Infrastructure and Transportation.

3.

ICHIJIKAN Fire-Resistant Packs

In terms of configuration, almost all piping for utilities consists of plastic pipe or those provided with plastic lagging,and because the shrinkage in volume when exposed toflame or heat is so dramatic, materials with heat expanding properties are generally used with respect to measures at lead-throughs.
ICHIJIKAN fire-resistant packs consist of heat expanding materials wrapped with plastic film, so they constitutea simple and clean construction technique.
3.1 Features(1) Depending on the aperture size, the required heat
expanding material is sealed in a single plastic film

and used directly, making it unnecessary to fill withmortar or other non-flammable material.
(2) Since it is sealed in plastic film, there is no fear of soiling either the vicinity of the lead-through or the hands.
(3) Depending on aperture size, the five-size kit is available.
(4) S ince there is no need to cover in mortar or use
power tools, set-up work can be accomplished in alabor-efficient manner.
(5) Renovation work can be easily addressed by removing a HEATMEL pack, laying any piping, and reinserting the pack.
3.2 Fire-Resistant Properties
As a result of the heat expanding properties of HEATMEL
packs, they have passed legally established flammability
tests, and with respect to various wall and floor leadthroughs for copper tubes with heat-insulating sheathing
and plastic tubes, they have obtained certification by
Japan’s Minister of Land, Infrastructure andTransportation.

4.

ICHIJIKAN HOLD

These are suited to use in condominiums and other apartment buildings at lead-throughs for utilities piping, suchas plastic pipes for hot and cold water supply.
4.1 Features(1) ICHIJIKAN HOLD are products molded from heat
expanding material.
(2) Molded heat expanding material can easily be fitted
over piping, and can be installed in apertures.
(3) Is available in two sizes, S and L, and can be usedwith pipes with outside diameters of up to 48 mm.

Cables, etc.

Fire-resistant blocks

Figure 3

Typical ROKUMARU applications.

Support ﬁtting

4.2 Fire-Resistant Properties
As a result of the heat expanding properties of ICHIJIKAN
HOLD, they have passed legally established flammability
tests, and with respect to various wall and floor leadthroughs for plastic tubes etc., they have obtained certification by Japan’s Minister of Land, Infrastructure andTransportation. Also, in evaluation by the Fire Protection
Equipment Center of Japan, they have been confirmed toHEATMEL packFloor sheet

Hold ﬁtting

Refrigerant lines, etc.

HEATMEL pack

PVC piping

HEATMEL packFigure 5
Figure 4

ICHIJIKAN fire-resistant pack kits.

Typical installations of ICHIJIKAN fire-resistantpacks.

Furukawa Review, No. 32

200770Furukawa Fire Limit Lead-Through Treatments to Meet Varied Needs

have the performance under Ministerial Ordinances andnotifications relating to the Fire Defense Law.

ＨＤ-Ｌ
ＨＤ-ＳFigure 65.

ICHIJIKAN HOLD.

HoldPiping

CONCLUSION

Achieving longer life for buildings and structures presupposes not only routine maintenance, but also large-scale
programs of repair and renovation. This raises the issuesof ease of removal and re-installation at the time of renovation, and of reducing the amount of scrap material andmaking it easier to recycle.
It is our view that ROKUMARU, reusable construction
techniques as exemplified by ICHIJIKAN fire-resistantpacks, and ICHIJIKAN HOLD, which involve no components other than the requisite heat expanding material,
offer effective ways of addressing these issues.
In future we are committed to developing products thatare responsive to the needs of the market, and to make acontribution to the community by supplying products forthe treatment of lead-throughs in fire limits.
For more information, please contact:
Fire Prevention Products Division, Furukawa TechnoMaterial		 TEL: +81-463-24-9341 FAX: +81-463-24-9346		 URL: http://www.fitec.co.jp/ftm/Figure 7

Typical installation of ICHIJIKAN HOLD.

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200771