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FR-20
Magnesium hydroxide [Mg(OH)2]
F-37
Application Data Sheet for Polypropylene
(PP)
FR-20, a series of high purity grades magnesium hydroxide, is offered by ICL-IP
as inorganic halogen free flame retardants (FR) recommended where use of
halogenated products is limited or prohibited.
FR-20 is particularly suitable for use with PP. As a result of its chemical nature,
high purity and excellent thermal stability (Table 1 and 2), FR-20 exhibits
inherent advantages over other halogenated free FR additives currently used for
the same applications.
Table 1: Properties of FR-20
FR-20 grade
S7
CAS Number
Assay, w%
Specific gravity
Molecular weight
Bulk density, g/ml
Particle size, µm
(Malvern Mastersizer 2000)
D 50
D 90
Surface area (BET), m2/g
S10
1309-42-8
99.4
2.3
58.3
0.55
1.45 – 1.80
<6
1.10 – 1.60
<6
7±1
10±1
Grades with special surface treatments to optimize processability and properties
are recommended with PP application.
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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The use of FR-20 is advantageous when the following properties are required:
•
•
•
•
•
•
•
halogen-free flame retardancy
low and non toxic smoke
high thermal and long term heat–aging stabilities
dimensional stability after injection molding
acid scavenger and heat stabilizer
reinforcing filler
improves tracking index
FR-20, designed for high levels of fire retardancy (UL-94 class V-1 and V-0), is
usually efficient at loadings between 40 and 65%.
‰
Thermal stability
FR-20 has a high thermal stability up till 3400C and its use is recommended where
alumina trihydrate (ATH) is not sufficiently stable.
Thermogravimetric analysis of FR-20 (Table 2) reflects its high thermal stability
allowing high processing temperatures typical to PP. Its thermal stability
combined with excellent resistance to degradation, makes it a product of choice
when recycling is an issue.
Table 2: Thermo gravimetric analysis (TGA-100C/min in air)
‰
Weight loss, %
Temperature, 0C
2
5
10
370
385
402
Excellent smoke suppressant
FR-20 is also a powerful smoke suppressant and it is one of its main advantages
over halogen- and antimony- based FRs. Halogen based PP compounds burn with
intense black smoke leading quickly to high values of smoke density in a NBS
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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chamber (Figure 1). On the contrary, PP compounds flame retarded by FR-20 are
generating very little quantities of smoke.
Figure 1: Smoke optical density of V-0 PP
(NBS smoke chamber - ASTM E 662-94 - Flaming mode)
1000
Optical density, DM
Br FR + Sb2O3
(no FR-20)
750
500
Ref no FR
250
62% FR-20
(no Br FR)
0
0
2.5
5
7.5
10
12.5
15
Time, min
‰
Surface treatment
In order to cope with the high loadings needed to get class V-1 or V-0, surface
treated grade FR-20 120 is preferred for extrusion and injection moulding
applications of PP.
FR-20 120 has indeed a good contribution to improve melt flow during injection
molding (Figure 2).
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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Figure 2: Influence of surface treament on MFI
(PP homo V-0 with 62% FR-20; 230°C - 2.16 kg)
100
MFI, %
75
50
25
0
PP ref.
‰
PP + FR-20 120
PP + FR-20
untreated
Processing conditions
Tables 3 provides indicative formulations enabling to get class V-0 (1.6mm) with
PP homo- and block copolymers flame retarded by FR-20 120 and their
properties.
It may be advisable to feed FR-20 120 in two steps:
Circa 40% in the feeding zone
The rest, 20-25%, at the end of the second third of the extruder via a sidefeeder.
Typical processing conditions to compound and mold PP flame retarded with FR20 120 are as follow:
Compounding:
Compounding in a co-rotating twin-screw extruder (L/D = 32)
Temperature profile, 0C:
120-170-170-170-180-190-200-210-220
Screw speed, Rpm:
430
Injection molding
Temperature profile, 0C
Mold temperature, 0C
220-220-230-230-230
80
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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‰
Properties
Properties achievable in PP homo- and block copolymers are summarized in
Table 3.
Table 3: Properties of PP flame retarded by FR-20 120
Type of PP
PP Homo
Ref. no FR
FR-20 120
Composition, w%:
PP
FR
Properties:
Flame retardancy:
UL 94 (3.2mm), class
LOI
MFI, g/10 min
(2300C; 2.16kg)
Tensile:
Max. strength, MPa
Elongation at break, %
Modulus, MPa
Impact IZOD notched, J/m
‰
PP Block copo
Ref. no FR
FR-20 120
100
-
38
62
100
-
36
64
NR
19
3
V-0
30
3
NR
18
7
V-0
29
7
36
158
1600
25
17
20
5700
38
25
74
1500
120
15
1
4300
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Applications
The range of applications for FR-20 120 in PP is very wide (Figures 3 & 4):
• E & E: switches, wire and cables, connectors
• Automotive: under the hood electrical parts, wire and cables, trimmings and
cover panels
• Building: thermal insulation foam, panels, sheets, ceiling parts and films
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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Figure 3: Under the hood electrical parts
Figure 4: Insulating foams
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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For further advice and assistance, contact our representatives in your area:
North America
Far East
Ameribrom Inc. USA
China
Phone: +1 877 661 4272
Fax: +1 314 983 7641
E-mail: [email protected]
ICL China
Phone: +86 21 6340 3322
Fax: +86 21 6340 3292
E-mail: [email protected]
Europe
Main Office
Eurobrom B. V.
Japan
Phone: +31 20 800 5800
Fax: +31 20 800 5805
E-mail: [email protected]
Bromokem Ltd Japan
Phone: +81 3 3552 1611
Fax: +81 3 3552 1616
E-mail: [email protected]
Italy
PM Chemicals Italy
Phone: +39 02 204 87225
Fax: +39 02 204 9449
E-mail: [email protected]
Pacific Rim
United Kingdom
Asiabrom Ltd Hong-Kong
Eurobrom UK
Phone: +852 28277761
Fax: +852 2824 1502
E-mail: [email protected]
Phone: +44 208 4050712
Fax:
+44 208 4050712
Mobile:+44 778 5788505
E-mail: [email protected]
Other Parts of the World
Isbrom
Phone: +972 8 6297 633
Fax: +972 8 6297 878
E-mail: [email protected]
Head Office
ICL Industrial Products
Phone: +972 8 6297 608
Fax: +972 8 6297 846
E-mail: [email protected]
Tecnet 070305
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The information herein is believed to be correct and is given in good faith, but no warranty, expressed or implied, is made with respect to the
product described or its use. As the use of this product is beyond our control, the user must accept responsibility for its suitability for any
particular application. No statement may be construed as permission or recommendation for any use that would infringe on any law, ordinance
or patent.
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