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FLAME CUT GREP Series


NEW HALOGEN-FREE TYPE FLAME RETARDANT SYSTEM
ntroduction of GREP Series
The GREP Series is a new and halogen-free type flame- retardant system for thermoplastics.
GREP Series is a combination of GREP-EG (improved thermally expandable graphite) and other materials, RINKA(stabilized red phosphorus), APP(ammonium polyphosphate),and etc.

Lineup GREP-EG : Improved thermally expandable graphite
Characteristics
  GREP Series allows you to produce excellent flame retardant polymer compounds of high oxygen indices and rated to UL-94 V0.

GREP Series gives the opportunity of flame-retardant polymer compound with good mechanical properties.

GREP Series-containing polymer compounds do not produce any corrosive gas in fire or when heated. Smoke is also suppressed.
 
Mechanism
  GREP Series shows high performance of flame retardancy by combining two different effects.
One is due to the physical effect of expandable graphite and the other is due to the chemical effect of phosphoric chemicals by way of example red phosphorus and ammonium polyphosphate.

Expandable graphite-containing polymer compounds expands like a fiber when in fire or when heated. The expanded graphite covers the surface of the molten phase and protects from the heat of fire. This performance is directory depends on the expansion of graphite.
This expansion of graphite is proportional to its distributions of particle size.

Flame retardant mechanisms of phosphoric chemicals are well known by literatures of authors that phosphoric chemicals reduce the flammability of the polymer compounds by reacting chemically in the molten phase.
 
Pattern of sieved GREP-EG(%)
+24 mesh
 0.5
+32 mesh
 3.0
+48mesh
 63.5
+60mesh
 13.0
+80mesh
 10.0
-80mesh
 10.0
 
Uses
  Parts of electric appliance
Cable and enclosure of cable joint
Sealing for window
Car and Airplane seats
 
Precaution
  Recommended to use a single screw kneader. If a twin screw kneader is used, screw composition should be set for mild kneading.
Do not use mesh(screen pack).
Smashed GREP-EG will lead to a degradation of the flame retardancy
 
Application
PP
HIPS
LDPE
ABS
PBT
Resin
100
100
100
100
100
100
100
100
100
100
100
100
100
GREP-EG
8
10
10
8
10
10
5
10
Red phosphorus
4
5
5
4
5
5
10
5
MG(OH)2
25
Oxygen Index
19.0
26.0
27.0
31.5
18.5
29.5
18.5
28.0
18.5
30.5
23.0
29.0

34.5
UL-94(1/8inch)
HB
V0
V0
V0
HB
V0
HB
V0
HB
V0
V2
V2
V0
UL-94(1/16inch)
HB
V2
V0
V0
HB
V0
HB
V0
HB
V0
HB
V2
V0

PP
HIPS
LDPE
PBT
Resin
100
100
100
100
100
100
100
100
100
100
100
100
GREP-EG
23
38
13
23
14
28
10
15
APP
7
19
7
12
7
14
10
10
Oxygen Index
19.0
27.0
28.0
18.5
27.0
28.0
18.5
28.0
28.0
23.0
29.5
33.0
UL-94(1/8inch)
HB
V0
V0
HB
V0
V0
HB
V0
V0
V2
V2
V0
UL-94(1/16inch)
HB
HB
V0
HB
V2
V0
HB
HB
V0
HB
V2
V0