Technical case · ACS/PC · Flame retardancy

Phosphate Flame-Retardant ACS/PC Alloy

A formulation and processing reference for ACS/PC blends, with reported flame-retardant, mechanical and flow properties compared with ABS/PC systems.

Case at a glance

Reported performance, in context.

The supplied reference compares phosphate flame-retardant systems at a 75:25 polymer mass ratio. These are source-reported results, not SCO Chemical test data or a certified product specification.

ACS:PC polymer ratio75:25Mass ratio used in the performance comparison

Reported flame ratingV-0ACS/PC result in the supplied table

Comparison-table loading14 partsDoher-7000, as identified in the reference

Material terminology. ACS is acrylonitrile–chlorinated polyethylene–styrene. Although the source section is headed “halogen-free flame-retardant ACS/PC alloy,” ACS contains a chlorinated component. This case therefore does not describe the entire blend as halogen-free.

Reference formulation

Composition and addition levels.

The formulation is reproduced as parts by mass. The ranges below are retained as supplied; they are not percentages and do not define one fixed recipe.

Reference formulation · unit: parts by mass
Component	Addition level
Polycarbonate (PC)	10–30
Acrylonitrile–chlorinated polyethylene–styrene (ACS)	70–90
Maleic anhydride-grafted acrylonitrile–styrene (AS-g-MAH)	3–5
Flame retardant	5.0
PTFE	0.5
Antioxidant	0.3
Other additives	As required

Two different loading statements. The formulation above lists 5.0 parts of an unspecified flame retardant. Table 6-24 separately lists Doher-7000 at 14 or 20 parts. The supplied excerpt does not explain this difference; the performance results below must not be attributed to the 5.0-part formulation.

Processing route

From drying to molded specimens.

These preparation conditions are reported in the supplied reference. They are a record of that procedure, not a universal processing recommendation for all commercial resin grades.

01 / DRYING

Prepare the resin components

Dry PC at 120°C for 6 hours. Dry ACS and the AS-g-MAH compatibilizer at 80°C for 4 hours.

02 / PREMIXING

Mix the formulation

Charge the resin components, compatibilizer, flame retardant and other additives into a high-speed mixer. Mix at 1,000 rpm for 10 minutes.

03 / COMPOUNDING

Extrude and pelletize

Use a twin-screw extruder at a reported temperature range of 180–205°C and a screw speed of 150–200 rpm.

04 / SPECIMEN PREPARATION

Injection-mold test samples

Prepare specimens by injection molding at the reported temperature range of 150–215°C.

Performance comparison

ACS/PC alongside ABS/PC.

All three columns retain the original table values. ACS:PC and ABS:PC are each 75:25 by mass in this comparison.

Supplied reference · Table 6-24 · phosphate flame-retardant ACS/PC and ABS/PC
Property	ACS/PC 14 parts	ABS/PC 14 parts	ABS/PC 20 parts
Doher-7000 loading (parts)	14	14	20
Reported flame rating	V-0	V-2	V-0
Tensile strength (MPa)	54	56	54
Notched impact strength (J/m)	220	285	186
Melt flow rate (g/10 min)	10	12	19
Heat deflection temperature (°C)	77.5	78.7	74.1
Color difference (source units)	5.2	9.6	10.4

In this comparison, ACS/PC is reported as V-0 at 14 parts, while ABS/PC is V-2 at the same loading and V-0 at 20 parts. At the reported V-0 conditions, ACS/PC has the same tensile strength as ABS/PC and higher reported notched impact strength and heat deflection temperature. These observations apply only to the listed reference systems.

Data scope. Adapted from the technical reference photograph supplied for this case. The excerpt does not identify the full publication, specimen thickness, flame-test standard, mechanical-test methods, MFR test conditions or color-difference method. V-0/V-2 are retained as reported classifications, not claimed UL certification. Doher-7000 is a source designation; no equivalence to a SCO Chemical grade is asserted.

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