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New Halogen-Free Flame Retardant Compounds




New Halogen-Free Flame Retardant Compounds

The market of flame retardant compounds keeps a steady growth and a continuous renewal of requirements looking forward an always improved reliability of operating components. Increased safety limits, regulatory changes and environmental concerns influence composition and proposal of new materials and drive the design concept of modern devices.

The result is a series of directives that are fundamentally changing the manufacturing process, with the goal to “encourage the design and production of E&E which takes into full account and facilitates their repair, possible upgrading, reuse, disassembly and recycling” also “substitution by safe or safer materials”.
RoHS and WEEE are example of these directives, applicable to household appliances as well IT equipment. The regulation REACH also implies a big change in the Chemistry legislation where plastics are included as well.

LATI, a European leader in the production of special compounds, has always dedicated extra care to its traditional core business that is the flame retarding thermoplastics.
To meet its valuable Customers’ new needs, LATI has developed a range of FR products that fulfils the widest range of requirements.
Both the E&E and home appliance sector can thus be supplied, respecting stringent parameters stated by the newest norm as, e.g., ISO/IEC 60335-1 (4th Edition).

In order to respect constant inquires coming from the market and the current legislation, Lati is introducing the HF1 range, featuring halogen and antimony free FR materials, all rated UL94 V0 and fulfilling RoHS restrictions.

LATAMID® and KELON – halogen and red phosphorous free reinforced PA6 and PA66
  • LATAMID 66 H2 G/25-V0HF1
  • LATAMID 6 H2 G/30-V0HF1
  • KELON B FR H2 CEG/500-V0CT3

Being two of the most recent winning grades developed by LATI, LATAMID 66 H2 G/25-V0HF1 and LATAMID 6 H2 G/30-V0HF1 offer a very interesting compliance to IEC 60335 requirements and are totally halogen and red phosphorous free.

Flammability Standard SI Units
    LATAMID 6 H2
G/30-V0HF1
LATAMID 66 H2
G/25-V0HF1

Oxygen Index

ASTM D 2863

32 %

32 %

Flammability Rating

 

   

3,00 mm thickness

UL 94

Class V-0 Class V-0

1,50 mm thickness

UL 94

Class V-0 Class V-0

0,75 mm thickness

UL 94

Class V-0 Class V-0

GWFI - Glow Wire Flammability Index

1,00 mm thickness

IEC 695-2-12

GWFI: 960/1.0 GWFI: 850/1.0

2,00 mm thickness

IEC 695-2-12

GWFI: 960/2.0

GWFI: 960/2.0

GWIT - Glow Wire Ignition Test

1,00 mm thickness IEC 695-2-13 GWIT: 800/1.0 GWIT: 800/1.0
2,00 mm thickness IEC 695-2-13 GWIT: 800/2.0 GWIT: 825/2.0
Status of UL approvals (file LATI: E 54080)
Flammability values – comparison: LATAMID 66 H2 G/25-V0HF1 and LATAMID 6 H2 G/30-V0HF1

Outstanding FR performance is achieved by UL94-V0 rating, from 3 down to 0.75 mm, GWIT 800°C at 1 mm and an outstanding GWFI exceeding IEC60335 specs.

Electrical performances are extremely good as well, with a CTI of 600V.
Nevertheless, mechanical performance of the described compounds is excellent despite the rich FR formulation and the fibre content allows PA to withstand up to 150 MPa as stress at break (tensile), an elastic modulus close to 10000 MPa and a good elongation at break confirming the total lack of brittleness.

An overview of global performance indicates the V0HF1 grades as the perfect candidate for most of the typical E&E structural applications, as connectors, housings etc.
The choice between PA6 or PA66 is left to the Customer, on the basis of necessary thermal performances.

Mechanical Properties

Standard

SI Units

    LATAMID 6 H2 G/30-V0HF1 LATAMID 66 H2 G/25-V0HF1
IZOD impact strength (sample 63.5x12.7x3.2 mm)

Notched, at 23°C

ASTM D256-A

110 J/m

95 J/m

CHARPY impact strength (sample 80x10x4 mm)

Unnotched, at 23°C

ISO 179-1eU

70 kJ/m2 75 kJ/m2

Notched, at 23°C

ISO 179-1eA

10 kJ/m2 8 kJ/m2

Tensile elongation (speed 5 mm/min)

At break, 23°C

ISO 527 (1)

3 % 3 %

Tensile strength (speed 5 mm/min)

At break, 23°C ISO 527 (1) 145 MPa 150 MPa
Elastic modulus
Tensile (speed 1 mm/min), 23°C ISO 527 (1) 9800 MPa 9500 MPa
Mechanical properties comparison: LATAMID 66 H2 G/25-V0HF1 and LATAMID 6 H2 G/30-V0HF1

When highest dimensional stability is required, mineral filled compounds must be taken into consideration.

The KELON B FR H2 CEG/500-V0CT3 is a 50% mineral filled PA6 offering not only an excellent respect of dimensional tolerances and moulding ease, but even a vastly reduced smoke emission in case of accidental fire. These features guarantee the KELON to be among the best product to be used also when risks related to fire hazards must be reduced to minimum level, as in any application dedicated to public use. Its formulation is completely halogen and red phosphorous free and overall fire performances can suit the IEC norm as well.

Flammability

Standard

SI Units

KELON B FR CEG/500-V0CT3

Oxygen Index

ASTM D 2863

42 %

Flammability Rating

 

 

3,00 mm thickness

UL 94

Classe V-0

1,50 mm thickness

UL 94

Classe V-0

0,75 mm thickness

UL 94

Classe V-1

GWFI - Glow Wire Flammability Index

 

 

1,00 mm thickness

IEC 695-2-12

GWFI: 960/1.0

2,00 mm thickness

IEC 695-2-12

GWFI: 960/2.0

GWIT - Glow Wire Ignition Test

 

 

1,00 mm thickness IEC 695-2-13 GWIT: 775/1.0
Status of UL approvals (file LATI: E 54080)
Flammability values - KELON B FR CEG/500-V0CT3

LARAMID - Halogen and Red Phosphorous Free reinforced PPA

•    LARAMID G/35-V0HF1

In order to offer a complete range of halogen free polyamide based compounds, LATI is fine tuning LARAMID G/35-V0HF1.
This grade guarantees high-end thermal performances of the semi-aromatic polymer PPA and the structural reinforcement offered by 35% glass fibre.
Flame retardancy features a V0 performance at 0.75 mm, GWIT, GWFI and CTI are ok for IEC 60335.
The material is actually undergoing the approval and certification process.

Properties Standard SI Units
LARAMID G/35-V0HF1 - PPA GLASS REINFORCED

Density

ISO 1183

1,5 g/cm3

Elastic Modulus

ISO 527

12500 MPa

Tensile Strength

ISO 527 145 MPa

Tensile Elongation

ISO 527 1,3 %

Notched Charpy

ISO 179 6 KJ/m2

Unnotched Charpy

ISO 179 30 kJ/m2

UL94 class 1,5 mm

UL94 V0

UL94 class 0,75 mm

UL94 V0

GWIT 1mm

IEC 60695 775°C
GWIT 2mm IEC 60695 775°C
GWIT 1mm IEC 60695 960°C
GWIT 2mm IEC 60695 960°C
CTI IEC 112 600 V
Main properties of LARAMID G/35-V0HF1 (PPA based compound: UL V0, Halogen Free, glass reinforced)

LATER® - Halogen and Red Phosphorous Free reinforced PBT

•    LATER 4 G/30-V0HF1
•    LATER 4-V0HF1

The same considerations apply to the equivalent PBT formulation where the same flame performances of the foretold PA grades are achieved on a PBT based halogen free formulation.
LATER 4 G/30-V0HF1 and LATER 4-V0HF1 guarantee a complete reply to all market requirements, providing a solution even where natural moisture absorption of PAs can be an issue.
New halogen free PBT formulations are available in both reinforced and unreinforced versions.

Properties Standard SI Units
    LATER 4 G/30-V0HF1
PBT Glass reinforced
LATER 4-V0HF1 PBT
Unreinforced

Density

ISO 1183

1,56 g/cm3 1,33 g/cm3

Elastic Modulus

ISO 527

10000 MPa 3050 MPa

Tensile Strength

ISO 527 140 MPa 40 MPa

Tensile Elongation

ISO 527 1,8 % 2 %

Notched Charpy

ISO 179 5,2 KJ/m2 1,5 KJ/m2

Unnotched Charpy

ISO 179 35 KJ/m2 15 KJ/m2

UL94 class 1,5 mm

UL94 V0 V0

UL94 class 0,75 mm

UL94 V0 V0

GWIT 1mm

IEC 60695    
GWIT 2mm IEC 60695 775 °C  
GWIT 1mm IEC 60695 960 °C 960 °C
GWIT 2mm IEC 60695 960 °C 960 °C
CTI IEC 112 575 V 350 V
Main properties – comparison: LATER 4 G/30-V0HF1 and LATER 4-V0HF1

LATEST NEWS

•    LATAMID 66 H2 G/25-V0KB4

LATAMID 66 H2 G/25-V0KB4 is the latest success of the red phosphorous based FR formulations.
The KB4 compound offers a complete compliance to IEC 60335 requirements: UL94-V0 down to 0.75 mm, GWIT=775°C and GWFI=960°C both at 1 mm, CTI=500V.
This said, the KB4 shows up as one of the best candidates for typical E&E application as switches, fuses boards, housings etc.

•      NANOFILLERS

Compounds featuring a reduced content of flame retardants additives have been obtained by LATI R&D taking advantage of nano-composite technology.
The product range is still under development but results already show much better flame resistance properties, with a faster and more efficient self-extinguishing mechanism and a remarkably reduced smoke emission.
Environmental advantages are evident and for this reason LATI keeps on studying this particular range:
the mission of LATI must be fully respectful of environment and human health, taking care of eco-sustainability as well.

Smoke evolution of a PA66 FR/reinforced + nanofillers compared with the same PA66 without nanofillers


30 October 2008
Contact:
email: marketing@it.lati.com
LATI Industria Termoplastici S.p.A.
Via F. Baracca, 7 21040
Vedano Olona (VA) - Italy
Tel. : +390332409111 - Fax: +390332409307

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