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High shear stability thermal stable PMA viscosity modifier
SCR-178A is a solution of polymethacrylate (PMA) in deeply refined mineral oil. A specialized and versatile viscosity index improver with excellent shear and thermal stability, suitable for blending of hydraulic oil, especially low-temperature hydraulic oil, and gear oil of multiple viscosity grades. Duel effects of depressing pour point and thickening with small dose, highly cost effective.

Product Characteristics
SCR-178A has a narrow molecular weight distribution and a stable structure. It offers high shear stability and excellent low temperature fluidity, efficient in improving viscosity index and inhibiting wax crystallization. This formula also offers excellent depressant effect for hydrogenarated base oil. Excellent filterability and demulsibility.

Recommended Dose
1%-10%

Typical Characteristics

List of Items	Standard Value	Typical Value	Test Method
Color	<2	<0.5	GB/T6540
Density, Kg/m3	-	931	GB/T1885
Flash point (COC), °C	>120	>150	GB/T3536
Thickening ability, mm2/s	4.0	6.5	SH/T0566
Kinematic Viscosity, mm2/s	550	1220	GB/T265

List of Items	Base Oil HVI 150	HVI 150 + 10% SCR-178A	Test Method
Appearance	Clear transparent viscous liquid		Visual
Low temperature dynamic viscosity, (-20°C), mPa.s	2250	2650	GB/T6538
Shear stability index(SSI)	-	4.7	SH/T0622-C
Pour Point, °C	-14	-32	GB/T3535
Thickening ability, mm2/s	-	6.2	SH/T0622-A

Packaging and Safety Information
Net weight: 175 Kg/drum, packed in 200 liter metal drum. Best Blending temperature: 50-60?. Please refer to SH/T0164 for transportation, storage and handling. Non-flammable, non-explosive, non-corrosive. Storage temperature below 60?, avoid repeated heating, keep away from heat.

SCR-178A PMA Viscosity Index Improver
Application Examples
1. Blending Low-Temperature Hydraulic Oil 46#

Base Oil	Hydraulic Oil Additive Package	Viscosity Index Improver	Pour Point Depressant
65% ETRO4 + 35% GS500N-4	Afton HiTEC 521	SCR-178A	SCR-248
100%	0.85%	7%	0.2%

Items		Low-Temperature Hydraulic Oil 46#	Test methods
Kinematic Viscosity, mm2/s	40 °C	49.03	GB/T265
	100 °C	9.645
Viscosity Index		186	GB/T2541
Pour Point, °C		-42	GB/T3535
Air Release Rate (50 °C), min		3.0	SH/T0308
Demulsibility (40-37-3) 54°C, min		5	GB/T7305
shear stability index (250 cycles, 40°C), %		0.72	SH/T0103

2. Blending Motor Gear Oil GL-5 75W/90

Oil Composition	Items	Characteristics	Test methods
81.6% 150N + 4.4% Afton HiTEC 3339 + SCR-178A	Kinematic Viscosity (100 °C), mm2/s	16.16	GB/T265
	Surface Viscosity (-40 °C), mm2/s	69600	GB/T11145
	Pour Point, °C	-42	GB/T3535
	Viscosity index	194	GB/T1995

3. Viscosity Index Indicators

HVI 150	SCR-178A	Kinematic Viscosity, mm2/s		Viscosity Index
		100 °C	40 °C
100%	0%	5.13	30.11	97
99%	1%	5.66	32.78	112
98%	2%	6.15	35.53	121
97%	3%	6.78	38.29	135
94%	6%	8.76	47.48	166
90%	10%	10.83	56.82	186