Cart empty

Flame Retardant clothes from a manufacturer
of ISO & NFPA certified FR fabrics

EN ISO 11612

Protective clothing against heat and flame

Supersedes EN 531:1995

The fabric has been tested by EN ISO 11612:2008 standards for a number of qualities including: 
 
•HEAT RESISTANCE,
•LIMITED FLAME SPREAD,
•HEAT TRANSFER
 
  1. This standards replaces EN 531:1995, but please note that the protective garments which have an EN 531 certification remain valid.
  2. The standards specifies the performance requirements for garments which protect the body from heat and  flame (except the hands).
  3. The standard is not applicable for fire fighters (EN 469) and welders (EN 470 - EN ISO 11611). 

ISO 11612:2008 specifies performance requirements for garments made from flexible materials, which are designed to protect the wearer's body, except the hands, from heat and/or flame. For protection of the wearer's head and feet, the only items of protective clothing falling within the scope of this International Standard are gaiters, hoods and overboots. However, concerning hoods, requirements for visors and respiratory equipment are not given.

The performance requirements set out in ISO 11612:2008 are applicable to garments which could be worn for a wide range of end uses, where there is a need for clothing with limited flame spread properties and where the user can be exposed to radiant or convective or contact heat or to molten metal splashes. 

ISO 15025 - A

I. ISO 15025- Code letter A (part of ISO 11612)

  • А - indicates that the garment meets the requirements for limited flame spread.
  • This test consists of applying a flame to a fabric sample for 10 seconds. To pass the test, the after flame & smoulder times and formation of holes must be within the tolerances (set in the standard). This test is also used for EN 531A.
  • The application of a flame can take place in two ways:
  • А1 — surface ignition method
  • А2 — edge ignition method
  • Requirements for parameter A
  • in procedure A (leads to Class A1), the flame is applied horizontally (similarly to EN 470-1 and EN 531)
  • in procedure B (leads to Class A2), the flame is applied laterally.
  • Minimum requirement, fabric combination conforms to the old EN 533 index 3

ISO 9151 - B

II. ISO 9151 - Code letter B (part of ISO 11612)

  • B - indicates that the garment provides protection against convective heat. (Insulation against convective heat)
  • Convective heat: determination of the heat transmission when exposed to flames. 
  • The sample is held above the flame and the rise in temperature on the topside of the sample is measured with a calorimeter. Subsequently, the length of time the sample can remain exposed before its temperature rises by 24 °C is determined.
  • Requirements for parameter B
  • B1:4 < 10 seconds
  • B2:10 < 20 seconds
  • B3:>21 seconds

Code letter B
indicates that the fabric
provides protection
against convective heat. 

Requirements for
parameter B

The highest level of protection
against convective heat 
is Level 3.

B1

4 < 10 seconds

Level 1 (Basic protection)

B2

10 < 20 seconds

Level 2 (Middle protection)

B3

> 20 seconds

Level 3 (High protection)

ISO 6942 - C

III. ISO 6942 - Code letter C (part of ISO 11612)

  • C - indicates that the garment provides protection against radiant heat (infrared rays).
  • Exposure to radiant heat. In this test, a fabric sample is exposed to radiant heat (infrared rays).
  • The temperature on the reverse (unexposed) side of the sample is registered using a calorimeter. Subsequently, the length of time the sample can remain exposed before its temperature rises by 240C is measured. The test procedure is the same as ISO 11611, but the classification is different:
  • Requirements for parameter C:
  • C1: 7 < 20 seconds
  • C2: 20 < 50 seconds
  • C3: 50 < 95 seconds
  • C4: 95 seconds and longer 

Code letter C 
 indicates that the fabric
provides protection
against convective heat. 

Requirements for
parameter C  

The highest level of protection
against radiant heat 
is Level 4.

 C1

 7 < 20 seconds

Level 1 (Basic protection)

C2

20 < 50 seconds Level 2 (Middle protection)

C3

50 < 95 seconds

Level 3 (High protection)

C4

95 seconds and longer

Level 4 (Highest protection)
 

ISO 9185 - D, E

IV. ISO 9185 - Code letter D and E (part of ISO 11612)

  • D - indicates that the garment provides protection against spatters of molten metal (molten aluminum)
  • Determining the level of protection against spatters of molten metal. 
  • A membrane (with similar properties to human skin) is attached to the reverse of the fabric sample. Subsequently, sequentially rising quantities of molten metal (for the D value - molten aluminium and for the E value - molten iron) are splashed on the sample.
  • The quantity of molten metal which deforms the membrane is determined.
  • Requirements for parameter D (The classification for molten aluminium):
  • D1: 100 < 200 grams
  • D2: 200 <350 grams
  • D3: 350 grams and more

Code letter D
 indicates that the fabric
provides protection
against spatters of molten aluminum

Requirements for
parameter D  

The highest level
of protection
against spatters of
molten aluminum
is Level 3

 D1

100 < 200 grams 

Level 1 (Basic protection)

D2

200 < 350 grams Level 2 (Middle protection)

D3

350 grams and more

Level 3 (High protection)

 

  • E - indicates that the garment provides protection against spatters of molten metal (molten iron)
  • Determining the level of protection against spatters of molten metal. 
  • A membrane (with similar properties to human skin) is attached to the reverse of the fabric sample. Subsequently, sequentially rising quantities of molten metal (for the D value - molten aluminium and for the E value - molten iron) are splashed on the sample.
  • The quantity of molten metal which deforms the membrane is determined.
  • Requirements for parameter E (The classification for molten iron):
  • E1: 60 < 120 grams
  • E2: 120 < 200 grams
  • E3: 200 grams and more 

Code letter E
 indicates that the fabric
provides protection
against spatters of molten iron

Requirements for
parameter E

The highest level
of protection
against spatters of molten iron
is Level 3

 E1

60 < 120 grams 

Level 1 (Basic protection)

E2

120 < 200 grams  Level 2 (Middle protection)

E3

200 grams and more

Level 3 (High protection)

ISO 12127 - F

V. ISO 12127 - Code letter F (part of ISO 11612)

  • F - indicates that the garment provides protection against contact heat.
  • Exposure to contact heat. In this test, a fabric sample is exposed to contact heat.
  • Requirements for parameter F:
  • F1: 5 < 10 seconds
  • F2: 10 < 15 seconds
  • F3: 15 seconds and longer 

Code letter F
 indicates that the fabric
provides protection
against contact heat

Requirements for
parameter F  

The highest level
of protection
against radiant heat 
is Level 4.

 F1

 5 < 10 seconds

Level 1 (Basic protection)

F2

10 < 15 seconds  Level 2 (Middle protection)
F3

15 seconds and longer

Level 3 (High protection)

 

Protective clothing – Clothing to protect against heat and flame

Here you can see all the required tests for ISO 11612 given in a table:  

 

 Fabric Tests

Code letter

 Test Method

 REM 

1.

 5.2 Pretreatment

 

 ISO 6330: 2000

See Note

2.

 6.2.1 Heat resistance (180°C)

 

 ISO 17493: 2000

94

3.

 6.2.2 Heat resistance (260°C)

 

 ISO 17493: 2000

94

4.

 6.3.2 Flame spread - face ignition (A1)

A1

 ISO 15025: 2000 (A)

120

5.

 6.3.3 Flame spread - edge ignition (A2)

A2

 ISO 15025: 2000 (B)

120

6.

 6.4 Dimensional change

 

 ISO 5077: 2007

37

7.

 6.5.1 Tensile strength

 

 ISO 13934-1: 1999

66

8.

 6.5.2 Tear strength

 

 ISO 13937-2: 2000

66

9.

 6.9.2 pH - value

 

 ISO 3071:2005

45

10.

 7.2 Convective heat (B)

B

 ISO 9151: 1995

116

11.

 7.3 Radiant heat (C)

C

 ISO 6942: 2002

116

12.

 7.4 Molten aluminium splash (D)

D

ISO 9185: 2007

366

13.

 7.5 Molten iron splash (E)

E

ISO 9185: 2007

432

14.

 7.6 Contact heat (F)

F

 ISO 12127: 1996

116

 
Note: The cleaning pre-treatment cost depends on the type of cleaning and the number of cycles specified by the manufacturer. BTTG Fire Technology Services can undertake cleaning to ISO 6330; the cost of 5 wash/dry cycles, for example, is £120 (+VAT). If dry-cleaning to ISO 3175 or “industrial" washing to ISO 15797 is required this will be sub­contracted (price on application). 
PROMOTIONS & OFFERS
Sign up for free sale notifications
INDUSTRY
FR FABRIC
FR TAPE & ZIPS
FR WORKWEAR
TYPE OF PROTECTION
Army & Police 100% Cotton    
Electric Utility 88/12 Modacrylic FR Jackets ISO 11611
Emergency (911) 80/20 Cotton/Polyester FR Pants ISO 1149-5
Mining 99% Cotton/1%Antistatic  FR Shirts NFPA 2112
Oil & Gas 93 M-Aramid/5 P-Aramid/2AS  FR Underwear NFPA 70/E
Power Plants 100% Meta-Aramid FR Rainwear ASTM F1506
Railway Roads 100% Para-Aramid   ASTM F1959 (ARC)
Welding 50% FR-Viscose/50 M-Aramid   EN 61482-1-2
  N 3A Aramid   EN 469
  FR Reflective tapes   EN 61482-1-2 (ARC)
  FR Zippers    
  FR Sewing threads