What is ISOFIX? All about the standard for securing child car seats


ISOFIX (International Standards Organization FIX) is a fastening system developed by the International Organization for Standardization (ISO), standard number ISO 13216. The purpose of the standard is to improve the safety of children in cars by creating for automakers a single universal system for simple and reliable fastening of child restraint systems (car seats) , infant carriers, boosters) and reducing cases of their incorrect installation in vehicles.

The development of the standard began in 1989 by 85 experts from 19 countries within the working groups ISO/TC22 “Road vehicles” and SC12 “Passive safety of crash protection”. Part 1 of the standard describing ISOFIX fastenings was published in 1999, the basic standard 13216-1 provides requirements for the location of fixation brackets, the distance between them and the geometry around the fastening points, as well as static strength. The bracket brackets must be rigidly connected to the car body, have a diameter of 6 mm, the length of the protruding part of one bracket is 25 mm, the distance between the brackets is 280 mm. Part 2 of the standard was published in 2004, ISO 13216-2 describes methods of fastening with the top rope (anchor strap) together with the main fastening brackets, regulates positioning zones, dimensions of the anchor bracket, static strength and other technical requirements. The top cable (anchor belt), according to the standard, can be used in combination with car seats secured with car seat belts. Part 3 of the standard was published in 2006, ISO 13216-3 regulates the dimensions of child restraint devices (car seats) and the classification of space in cars required to accommodate these devices.

Despite the fact that the Isofix standard was introduced quite a long time ago, fastenings began to be installed in basic car models in 2006. In Europe, since 2011, all manufactured cars must have the Isofix fastening system.

What is Isofix, why is it needed and what are the misconceptions about it?

When young parents are faced with the problem of choosing a child car seat, they read a lot of strange and “scary” words, the meaning of which they know nothing about, but they begin to believe that it is very necessary. I'm talking about terms such as Isofix (in various interpretations and with various additions such as Plus and others), anchor fastening, “leg” and others. Without understanding the need, they begin their selection with a strict decision that the name of the chair should contain the word “Isofix”. Therefore, I decided that I need to understand in more detail what it is and tell you.

Design and principle of operation

The Isofix system consists of 2 components:

  • two brackets (sleds) as part of the child car seat platform;
  • steel brackets (reciprocal part of the fastening), rigidly connected to the body.

To secure the child seat in the car, you need to insert the slide into the brackets and close the locks. The design prevents the installation of a car seat with errors: it is fixed correctly or not fixed at all. To remove the chair from the interior, you need to unlock the locks.

The distance between Isofix brackets is standard for any restraint system with such a fastening system. The mate is usually located on the left and right seats in the back, but there are cars that have Isofix anchors installed on each seat (except the driver's).

What is Isofix?

This is a method (system) of rigidly attaching a child car seat to a car. Isofix is ​​considered an international standard for manufacturers of cars and car seats. The main advantage of this system is that it reduces the likelihood of incorrect installation of the seat, and also increases the degree of protection for the child. Without Isofix, about 70% of incorrect seat installations occur. With the Isofix system, you just need to correctly direct and click the locks on the brackets that are in the car.

This system has two so-called brackets, which are located at the base of the child seat. They cling to the car's brackets, which are located between the back and seat of the car seat. Most often these are the seats in the back of the car and are located on the right and left of the sofa.

What if you don't find Isofix fasteners in your car?

It often happens that a car is equipped with an Isofix system, but it cannot be found. Even if you have a modern car. The answer is simple - there are no fastenings in the car. You need to contact the service center and order an Isofix installation. As a rule, this does not take much time.


Fastening system

Many drivers ask whether it is possible to install Isofix themselves if this option is not provided in the car? Such a car does not have the necessary fasteners and it will be difficult to install the brackets. In addition, such an installation will not meet the requirements and standards. Self-indulgence can only do harm.

If there is no Isofix system, then it is better to choose another reliable and proven child car seat. Expensive models provide security that is not inferior to Isofix.

Which child car seats can be found with Isofix?

This system is used for car seats of groups 0+ and 1. Also, universal seats suitable for use by these age groups are also equipped with Isofix. This includes transporting a child up to approximately 3-3.5 years old and weighing up to 18 kg. And most importantly, such a chair should have its own built-in internal seat belts. This is all taken into account by strict standards and there cannot be any other variations.

In these groups of car seats, you can find real Isofix, which absorbs the full force of the impact in an accident and holds the seat and child in place. It offers great benefits in security and installation.

Which cars have the Isofix system - the history of its implementation

In the 90th year of the last century, the International Organization for Standardization introduced a unified ISO standard for the Isofix system of fixation (fastening) of child car seats. These standards were reflected in the edition of the ECE R-44 rules in 1995 and, starting from 1996, it became mandatory in European countries to include fastening brackets rigidly connected to the car body, located at a distance of 280 millimeters, into the design of cars, for those developed from this year cars.

These connectors should be located between the rear seat cushion and the backrest, marked with the words “Isofix” and a picture of a cradle. Since 2011, the rules have become mandatory for all cars sold and manufactured in the European Union.

Let's look at Isofix for each individual group.

– group 0+ (from 0 to 13 kg). Basically, Isofix is ​​not located in the cradle-car seat itself, but in the base on which this seat is placed. With this, manufacturers try to achieve maximum convenience for parents and baby, because... you don’t have to take your sleeping child out of the chair; they simply remove it from the base and carry the child home in the cradle-car seat. This gives a great advantage over fastening the chair with belts; you don’t have to deal with installing the chair again and again every time, you just put it on the base and also remove it using a handle or button.

The only drawback and inconvenience of this variation is that the base is purchased separately and, as a rule, it costs the same as the chair, or even more. After the child has grown up and there is a need to buy a car seat of the next group, the base for the new seat is no longer suitable (there is, of course, an exception, Maxi Cosi Pebble for example).

-group 1 (from 9 to 18 kg). In this group, Isofix is ​​built into the base of the chair itself (with the exception of the example written above).

– universal chairs 0+/1. There are more options here. Isofix is ​​also located in the base of the chair. But due to the fact that such a car seat must be installed in the direction and vice versa, there are nuances. Isofix can only be used for group 0+, or the chair can be rotated to change the direction of installation, or the chair can generally be rotated a full 180 degrees, which also makes it possible to conveniently get the child in and out (for example, this Romer Dualfix chair).

There are also several additional fastenings that increase safety. But many do not understand what they are and why they are needed and whether they are needed at all. Let's figure out what a “leg” and Top Tether are.

Due to the fact that Isofix is ​​a fastening at two points along one axis, in some cases of an accident there is a need for a third point of support so that the seat does not move forward. To do this, we came up with two types of additional support:

  1. "Leg". This is a retractable floor support (telescopic “leg”), which is located in the front of the chair. It reduces the load on the isofix and prevents the seat from moving when the car rotates.
  2. Top Tether anchorage. It looks like an additional original belt that comes out from the back of the car seat. It has a carabiner at the end, which is attached to a bracket in the car (it is either in the trunk floor or behind the second row of seats in the car). Nowadays new cars are produced with a special place for this mount.

By the way, I have a review of the Nania I-Max SP chair, which uses the Top Tether “leg”.

Since Isofix takes on heavy loads, it is not allowed to be used if the child weighs more than 18 kg. Also, the chair itself with this system should not weigh more than 15 kg.

There are car seats that can be installed with Isofix without a third support point, but only with specific cars (the list is usually included with the child seat and is quite large).

Advantages and disadvantages of Isofix


The Isofix system has both advantages and disadvantages. Its advantages include the following.

  • Easy to install. It is very easy to install a child seat on any car that has the appropriate base. This does not require any special skills or even specialized tools. The installation can be carried out, as they say, “with your bare hands.”
  • Maximum reliability. The latches hold the bracket firmly enough. Therefore, significant displacement or overturning of the fixed structure is practically excluded. This means that the baby's movement becomes much safer.
  • Versatility. Most passenger car models use Isofix. Thanks to this, any seat can be installed on any vehicle. This is very convenient - there is no need to select a device specifically for your car.
  • Long service life. Car seats have a rigid frame made of stainless steel. It is rigidly attached to the guides, which are attached to the brackets. This guarantees strength, and therefore a long service life of the structure.
  • Possibility of use for children of different ages. Isofix standard seats are installed in the direction of travel of the vehicle, so children under the age of 1 year can be transported in them without any problems (subject to the requirements for the size of the device).

And these are the main shortcomings of the system.

  • Risk of injury in a frontal collision. The rigidity of the seat ensures its reliability. However, this also has the other side of the coin - in the event of a head-on collision, it takes over the entire impact impulse. This is fraught with injuries to various parts of the child’s spine. Systems that are secured with belts have a certain degree of shock absorption, so this does not happen there.
  • Weight. Since the guides and frame are made of stainless steel, the structure is quite heavy. This makes it difficult to carry by hand.
  • Price. Models with Isofix are 1.5 - 2 times more expensive than others. This is due to the fact that manufacturing car seats for children from metal is expensive.
  • Inability to ensure the safety of an older child. Isofix does not guarantee protection for small passengers if they weigh more than 18 kilograms. Therefore, it is more suitable for children under 6 – 7 years old. Of course, you can also transport older children. But in this case, the car seat will simply make the ride more comfortable, but will not be able to protect children in the event of an accident.


Another fairly common problem that arises when using Isofix is ​​misalignment of the guides and brackets. Although ISO has established the distance that should be required from one anchorage to another, not all seat and car manufacturers adhere to the standard. Sometimes they allow a deviation of 0.5 - 1 centimeter. Despite the fact that this is very small, it will not allow the structure to be mounted normally. This problem most often occurs when installing the system in the rear seat. The situation with the front ones is much better - everything is usually mounted here without any problems.

Car radios

"Isofix" and group 2-3 (for children from 3 years old, 15-36 kg)

In this age group, this is not the “Isofix” that I described above. Due to the fact that real Isofix cannot be used after reaching a certain weight, the child is fastened with a group 2-3 car seat using standard belts, and the so-called “isofix” is called other derivative words - “isophyte”, “kidfix”, etc. .

It is considered a compatible mounting method, since the main safety function is performed by a standard belt. Therefore, the seat must be able to move forward under heavy braking in order for the belt to engage and keep the child in place. But Isofix would not have given such an opportunity, so they came up with other special designs that allow the chair to move forward. And it is for this same reason that the “leg” and the Top-tether belt are not found in this group.

What's the point of this then? Yes, this system does not bear a special security burden in groups 2-3. But there are also positive aspects: it limits the displacement of the seat in a side collision; it is more convenient to seat the child, as the chair is more stable; There is no need to fasten the seat belts if you are eating without a child.

Other analogues - Latch system

In the United States, the equivalent of Isofix is ​​the Latch system. It is similar to Isofix, but has some design differences. Instead of rigid brackets, the Latch system uses soft straps with carabiners. They also attach to brackets in the seat. The result is not a rigid, but a movable coupling of the car seat. But Latch also has its winning sides.


Latch Mount

Advantages of the Latch system:

  • elastic coupling produces less vibration;
  • lighter weight of the car seat (about 2-2.5 kilograms compared to Isofix);
  • maximum child weight for the Latch system is 30 kilograms;
  • Each lock can be fastened separately, and not simultaneously as in Isofix.
  • The American analogue is also compatible with Isofix. If desired, you can install both models.

Disadvantages of the Latch system:

  • the movable mount is accompanied by a high risk in the event of a side impact;
  • Latch chairs are expensive - there are no budget models;
  • Seats can only be installed on the rear side seats;
  • In Russia and the CIS countries, the Latch system is not as widely represented as Isofix.

How does Isofix work for universal group 1-2-3 car seats?

Many people want to buy a super-universal option that will last a long time, be economical and convenient, and must be equipped with Isofix. But there is a “catch” in this group with such a system. Isofix cannot work on all groups at once, for the same reason as described above. There were attempts to create such a universal chair at Romer, but, alas, it did not work out. For group 1, in such a chair, isofix performs its function, but for groups 2 and 3 it has an exclusively decorative function.

There is a chair in this group with safety tables and isofix. In this case, for group 1, Isofix fixes the seat in the car, but the main safety is provided by the table, and for groups 2-3, the safety is provided by regular seat belts, which fasten the child and the seat, and here Isofix again does not bear the active load.

Options for universal car seats with built-in seat belts and Isofix are starting to appear, which are suitable for all groups at once. But for the most part, test drives have not been carried out on these models.

There is, of course, also an option from America, the so-called LATCH. It differs from Isofix in that instead of metal car seat brackets, the seat is attached with straps with latches. But the necessary tests have not been carried out on them, so you can only rely on the tests of the manufacturers themselves at your own peril and risk.

What does the Isofix mount look like and its design features?

To ensure the possibility of attaching Isofix car seats, the design of the car seats must include two metal brackets placed at a standard distance from each other. This fastener is included in the basic equipment of vehicles manufactured since 2006. Mounting points are usually marked with Isofix.

As a rule, the two rear outer seats are equipped with Isofix fastenings; on some cars they are available on all seats.

In any case, before purchasing a car seat, you should carefully examine all seats, since they can be located hidden, and may not always be indicated with appropriate information signs, especially in cases where the upholstery of the seats has been changed.

In some car models, these may be buttons with pictograms.

In child car seats, Isofix fastening elements can be located on different sides. Before you buy a car seat with an Isofix mount, you need to familiarize yourself with how it will be located in the car.

Options using additional structural elements are possible. These may be options such as “floor support” or Top Tether, “anchor” fasteners.

Top Tether “anchor” fasteners require the presence of an additional fastening element (bracket). Sometimes it is located in the trunk area, seat backs, even on the ceiling. The brackets are located hidden, they can be found by the corresponding designations with the “anchor” icon.

The “floor emphasis” option is more versatile and reliable. First, some vehicles do not come equipped with additional brackets for the “anchor” option. Secondly, the presence of an additional support on the floor increases the reliability of the structure and reduces the possibility of the structure overturning in the event of a collision.

Sometimes additional floor support can be purchased separately. It is height adjustable as different seats have different seating heights.

Let's dispel some misconceptions about Isofix:

  1. The first and most common misconception is “Isofix car seats are safer.”

I think many people already understand from the article that for groups 0+ and 1 this is true, but for other groups it is not so. For them, Isofix does not bear any safety burden.

Of course, group 0+ and 1 seats with Isofix show high results in crash tests, although there are exceptions. And we must not forget that the quality of safety depends not only on the use of this system, but also on a number of other qualities inherent in the car seat, which can provide additional protection.

  1. The second misconception is that some believe that Isofix is ​​more dangerous due to its rigid fastening than fastening a car with a seat belt, since the belt does not operate abruptly and can stretch a little, therefore, there is less load on the child.

Many tests have been carried out on this matter and they show absolutely the opposite result. Therefore this is a big misconception.

Here I also want to add that if the seat has a good belt tensioner, then the seat shows better results in tests, since there is less load on the child.

ISOFIX is one of the safest fastenings!

Seats equipped with Isofix mounts are rigidly attached to the car body, which makes the seat more stable during a collision. There is a misconception that such a rigid fastening is dangerous for the child. And, supposedly, seats with belt fixation are less traumatic due to free movement until the car’s belts are fully tensioned. Numerous experiments refute this theory. Firstly, crash tests with the new generation Hybrid III dummies showed that seats with Isofix provide significantly less stress on the neck. This is a consequence of a rule that has long been known to specialists in the field of passive safety: the more stable the seat is during a collision, the faster the restraint systems begin to act, the better the occupants are protected. In addition, the internal belts of the car seat (which hold the child) are designed in such a way that the inertia of the baby’s movement is absorbed due to their elastic deformation and therefore, in general, the entire child safety system is quite elastic. Secondly, during a collision there is a sharp drop in speed from the original to zero in a short period of time. This process is very fast, but not instantaneous, because... The car body deforms for some time. And this is good, because... overload from an impact does not occur instantly, in one sharp peak, which we might not survive, but gradually. Same with the car seat inside. If it is not rigidly attached to the body, then its braking, and therefore the braking of the child fastened with internal straps, does not begin immediately. It turns out that the child extinguishes his kinetic energy in a shorter time interval than the body of a car, and receives a much larger peak load, which is precisely what poses a danger. For the same reason, the best safety results among Isofix seats with belt fastening are those that have a good belt tensioner.

Where to buy and how to choose a car seat with isofix

When purchasing a chair, find out if the car has Isofix; for example, Hyundai Solaris produced before 2004 does not have such fastenings. If this is your case, the purchased chair will not be able to be installed.

Be extremely careful when purchasing a car seat. Unfortunately, not all stores offer high-quality goods. Therefore, it is better to make such an important and expensive purchase in specialized reputable retail outlets.

When purchasing goods through an online store, ideally you should contact the company’s warehouse or showroom directly. Here you can independently verify that the device corresponds to the declared parameters and its mechanisms work normally.

In this case, preference should be given to certified devices with appropriate markings. It must indicate the number, as well as the country that issued the certificate. Its presence implies mandatory crash testing of the model and a high level of safety.

Table

Cars that have an isofix child seat mounting system:

BrandModelYear
Alfa Romeo1472000
1561997
Cross Wagon Q42004
1592005
Giulietta2010
GT2004
AudiA1 (8X)2010
A22000
A3 (8L)1997
A3 (8P)2003
A4 (8E)2002
A52007
A6 (C6)2004
A82002
Q32011
Q5 (8R)2009
Q72006
RS32010
RS42002
RS62004
TT2006
S42002
S62004
S82002
BMW1er2008
3er1998
3er (E92 / 320 d)2010
5er (E39)1995
6er Cabrio Coupé2004
7er2001
X12009
X32004
X51999
X62008
Z42002
ChevroletAveo2006
Epica2006
Cruze2009
Captiva2006
HHR2006
Kalos2004
Lacetti2004
Matiz2004
ChryslerNubira2004
300 C2004
Grand Voyager2001
Voyager2001
Sebring2003
PT Cruiser2000
CitroënBerlingo I1999
Berlingo II2002
Berlingo III2008
C-Crosser2007
C12005
C2, 3, 42004
C52001
C62005
C82003
C3 Picasso2009
C3 Pluriel (Cabrio)2003
C4 Picasso2007
C4 Grand Picasso2006
C5 Break2000
Jumper2007
Jumpy2007
Xsara Picasso1999
Nemo2007
DodgeAvenger2007
Caliber2006
Durango2004
Journey2008
Nitro2006
Fiat5002007
Bravo2007
Croma (generation I)2005
Doblò2001
Ducato2009
Grande Punto2005
Idea2003
Multipla2004
Panda2003
Punto Classic1999
Qubo (Fiorino III)2008
Sedici2006
Scudo2007
Stilo2001
Ulysses2003
FordC-MAX2003
Galaxy1995
Focus2004
Fiesta2002
Grand C-Max2011
Ka2002
Kuga2008
Maverick2005
Mondeo Combi2000
Mondeo Limousine2004
Transit Vario-Bus2006
S-MAX2006
HondaAccord (8th generation)2008
Civic2000
CR-V2005
Jazz2001
HyundaiAccent2006
Getz2002
Grandeur2005
Matrix2002
i10,i202008
i302007
ix352010
ix552009
Sonata2001
Santa Fe2002
Terracan2002
Tucson2004
JaguarS-Type1999
X-Type2001
XJ2003
XF2008
JeepCommander2006
Compass2007
Cherokee2002
Grand Cherokee2003
Patriot2007
Wrangler (JK)2007
KIACarens2002
Carnival2006
cee'd2007
Cerato2004
Magentis2002
Opirus2003
Picanto2004
pro cee'd2006
Rio2005
Sedona2006
Sorento2002
Sportage2004
Soul2009
Venga2009
Land RoverDiscovery 32004
Defender2007
Freelander2006
Range Rover2002
LexusGS 3002000
GS 450h2000
IS 200/3002001
IS 220d2005
IS 2502005
IS F2005
LS 4602006
LS 600h2006
RX 3002003
RX 3502003
RX 400h2003
Mazda323F2000
CX-72009
Mazda22007
Mazda32003
Mazda52005
MX-5 (NC)2005
MX-5 (NB)1998
Mazda62002
MPV1999
Premacy1999
Mercedes-BenzA-Class1997
B-Class2005
C-Class2000
CLC Sportcoupé2008
CLK Cabrio Coupé2002
CLS2004
E-Class2002
GL-Class2006
GLK2008
R-Class2005
M-Class1997
S-Class2002
Sprinter2006
Vaneo (V414)2001
Viano2010
Viano (FUN)2003
Vito Bus2006
MiniMINI Clubman2007
MitsubishiGrandis2004
L2002006
Lancer2003
Outlander2006
Pajero2001
Shogun2006
NissanAlmera2000
Micra2003
Murano2003
Navara2006
Note2006
NV 2002010
Pathfinder2006
Primastar2001
Pixo2009
Primera2002
Tiida2004
Qashqai2007
Qashqai +22008
X-TRAIL2002
OpelAstra (H)2004
Astra (Twin Top)2006
Agila2002
Antara2006
Combo (C)2001
Corsa (C)2000
Meriva2002
Insignia2008
Vectra2002
Vivaro2006
Signum2003
Zafira (A)1999
Zafira (B)2005
Peugeot107, 10072005
2062002
206 S.W.1998
206 CC2000
2072006
3072001
307 CC2003
307 S.W.2006
307 S.W.2001
3008 Crossover2009
3082007
308 S.W.2007
40072007
4072004
50082009
6072000
8072003
Partner2004-2005
Partner Tepee2008
PorscheCayenne2003
Panamera (970)2009
RenaultClio2005
Clio1998
Espace2000
Grand Space2000
Grand Modus2008
Grand Scenic2003
Kangoo1999
Kangoo be bob2009
Koleos2008
Laguna2001
Megane2003
Megane1999
Modus2004
Scenic (JM)2003
Traffic2001
Twingo2007
Vel Satis2002
SeatAlhambra1996
Alhambra (facelift)2004
Altea (XL)2006
Altea (FR)2005
Altea (Freetrack)2007
Arosa1998
Cordoba1999
Exeo2009
Ibiza (3rd generation)2002
Ibiza (4th Typ 6J)2008
Leon1998
Toledo1999
Saab9-3 (YS3F)2002
SkodaFabia1999
Fabia II2007
Oktavia Combi, I (1U)1996
Octavia II2004
Yeti2009
Roomster2006
Superb2001
SubaruForester2008
Impreza2000
Justy (G3X)2003
Legacy2003
Tribeca2006
Outback2004
SuzukiAlto2009
Ignis2004
Jimny1998
Liana2004
Splash2007
SX42006
Swift2005
Vitara2005
Wagon R2002
ToyotaAygo2005
Avensis (T25)2003
Avensis Verso2001
Auris2007
Corolla (E11)1997
Corolla Verso2001
Land Cruiser1998
Prado2009
Land Cruiser (V8/200/J20)2008
Previa2000
RAV42000
Prius2003
Urban Cruiser2009
Yaris (P1)2003
Yaris Verso2001
Verso2009
VolvoC30, 702006
S40(V)2001
S602000
S801998
V402003
V502004
V50 (Type M)2004
V702000
XC602008
XC702007
XC902002
VWBora1998
Fox2005
Caddy2000
Golf III, IV (Cabrio/Variant)1999
Golf IV1997
Golf V2003
Golf VI2008
Golf VI Variant2009
Golf Plus2005
Jetta2005
New Beetle2005
Lupo1998
Phaeton2002
Polo III (6N2)1999
Passat2000
Passat CC2008
Scirocco2008
Sharan2004
Sharan1998
Touran2003
T5 (Caravelle/Multivan)2003
Touareg2002
Tiguan2007

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Crash test results

Repeated crash tests have confirmed that in a number of vehicle modifications, the ISOFIX fastening system helps to achieve the maximum level of safety for a small passenger in the event of a collision between the vehicle and an obstacle or another vehicle.

Simplicity and convenience of fastening reduces the risk of incorrect fastening to a minimum level.

Child car seats are simply attached using latches to pre-prepared parts. It's hard to go wrong.

It is worth noting that a properly secured child seat largely ensures the safety of the child while the car is moving and in the event of an emergency.

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