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ZT-202C Halogen-free Flame Retardants for Glass-fiber Reinforced PBT

Halogen-free Flame Retardants for Glass-fiber Reinforced PBT (ZT-202C)

Product Description

ZT-202C is a kind of halogen-free and intumescent flame retardant with the major flame retardant elements N and P, compliance with RoHS regulations, no migration, no precipitation. ZT-202C has many properties such as halogen-free, environment-friendly, excellent flame retardancy and water resistance, the flame retardant PBT with ZT-202C does not release phosphine . ZT-202C is an ideal substitute of bromine-antimony in glass-fiber reinforced PBT.

Physical and Chemical Properties

Item Index Item Index
Appearance White powder Environmental requirements Compliance with RoHS
Nitrogen content, % ≥24 Phosphorous content, % ≥16
Whiteness, % ≥95 Moisture, % ≤0.3


Loading 15%~16% 19%~21%
UL 94 V-0 (3.2mm) V-0 (1.6mm)

Storage and Attention

Keep in dry, room temperature and moisture proof condition, preventing heat.


Net weight 25kg/bag, Compound paper-plastic bag and inner aluminum foil.

Application Manual

1.Typical formula

Formula adding HT-202C Formula adding DBDPE/ATO
PBT, % 50 56
Glass fiber, % 30 30
Flame retardant, % 20 14

2.Test Result
Item Testing standards Formula  adding ZT-202C Formula adding DBDPE/ATO
Flame retardancy (1.6mm) UL94 V-0 V-0
GWFI (960℃)
GB/T 5619.10-2006
Tensile strength, MPa
GB/T 1040.5-2008
106 113
Flexural strength, MPa
GB/T 9341-2008
203 221
Notched impact strength,kJ/m2
GB/T 1043.1-2008
10 10
Un-notched impact strength,kJ/m2
37 40
Electrical property (CTI), V GB/T 4207-2003 600 <200


(1)The flame retardancy of the glass-fiber reinforced PBT can reach UL 94 (1.6mm) V-0 when adding 20% of ZT-202C.

(2)The comprehensive properties of the glass-fiber reinforced PBT with ZT-202C are excellent, some properties are superior to that of PBT with bromine-antimony.

(3)ZT-202C could completely substitute DBDPE/ATO in glass-fiber reinforced PBT.

4.Attention Concerned
(1)Control the processing temperature below 260℃ in vacuum condition and use weaker shear screw combination.

(2)Never contact with any strong oxidizing substances (such as antimony trioxide),
otherwise causing the product discoloration.