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1、,润滑油脂基础,version 1.1,目的:,学习油脂润滑的知识学习正确选择润滑油脂理解SKF在润滑领域的能力,v 1.1,0/3,油脂是如何工作的?,隔离轴承的接触表面-降低磨损-降低摩擦保护轴承-防锈-防止外界污染,v 1.1,1/5,稀油还是油脂?,油脂:稀油:+易于填充(成本低！)+额外的冷却能力+提供对轴承的额外保护+有过滤能力(防止杂质、潮湿),80%的轴承采用油脂润滑,v 1.1,1/6,油脂是如何工作的?,just like aqua-planing!,滚动体在一层极薄的油膜上运动没有金属和金属之间的接触,v 1.1,1/7,润滑油脂不可思议的能力:,油膜的厚度相当于一层纸的
2、1/100,承受的压强相当于在指尖上 承受10 部汽车的重量,v 1.1,1/8,显微环境下的轴承表面,甚至最光滑的表面也需要润滑以防止磨损和减少摩擦,v 1.1,1/9,显微环境下的润滑情况:,液动润滑最理想的状态,边界润滑部分情况,v 1.1,1/10,什么是油脂:,油脂是稠化了的油,不是:-稠的油-固体油(蜡),类似海绵,v 1.1,1/11,基础油(70-95%),增稠剂(5-30%),添加剂,油脂包含了什么?,油脂=,+,+,v 1.1,1/12,基油种类:,矿物油(90%)一般应用合成油(10%)特殊应用,价格较贵天然油(1%)食品级,环保级,v 1.1,1/13,基油粘度:,粘度
3、=液体抵抗流动的能力,水:低粘度(1 cSt 20 C.),蜂蜜:高粘度(1200 cSt 20 C.),v 1.1,1/15,基油粘度(2):,寻找正确的平衡点,低粘度:+低摩擦-油膜薄,高粘度:+油膜厚-摩擦大,基油粘度随温度而变！,v 1.1,1/16,增稠剂类型:,金属皂基(70%)锂、钙等聚脲基(20%)可代替金属皂基硅/粘土(5%)宽温PTFE(Teflon)(1%)极高温度,昂贵,v 1.1,1/17,增稠剂类型:,金属皂基锂标准钙耐水,铝 热稳定性复合提高某种特性无皂基聚脲高温或宽温.粘土无滴点,宽温.硅 无滴点,宽温PTFE热稳定性好.高温,类型细类特性,v 1.1,1/18
4、,添加剂类型:,抗氧化剂延长油脂寿命极压(EP)添加剂防止冷焊现象 防腐蚀添加剂保护轴承固体添加剂(石墨,MoS2)当液体润滑失效的时候,v 1.1,1/19,为什么油脂会失效?,污染由于灰尘、磨屑等油脂硬化/软化基油氧化或流失变软机械稳定性不好被水或油污染,油脂的寿命会很长但不是无限!,v 1.1,1/20,油脂的 保存和使用:,不要储存在开放的容器里!防止灰尘及杂物!,v 1.1,1/21,油脂的特性:,工作温度(OAT),负荷能力/耐磨/极压特性(OAT),(OAT)耐磨损性,泵送性(TO),可过滤性(T),噪音特性(TMA),(TM)机械稳定性,耐水性(TMA),防锈能力(TA),影响
5、因素:O=基油 A=添加剂 T=增稠剂 M=制造工艺,(TOM)粘稠度,淅油率(TOM),可降解性(O),(OA)基油粘度,v 1.1,2/5,T1 T2 temperature T3 T4,禁止操作区,非安全操作区(仅可短期运行),安全操作区 i.e.可预测寿命,T1=低温极限T2=低温寿命极限T3=高温寿命极限T4=高温极限,i.e.轴承上测得的温度(e.g.外圈),油脂的工作温度范围:,SKF 的交通灯概念,v 1.1,2/6,T4,T3,T2,T1,球轴承,滚子轴承,安全操作区i.e.油脂寿命可预测,100,10,1,0.1,0.01,温度对油脂寿命的影响:,starvation pr
6、ocess degradation process,油脂寿命,轴承温度,v 1.1,2/7,LGMT 2,-50,0,50,100,150,200,250,LGMT 3,LGEP 2,LGWM 1,LGMB 2,LGHB 2,LGEM 2,工作温度范围:,SKF 服务市场(1),deg.C,v 1.1,2/8,LGLT 2,LGEV 2,LGLC 2,LGHQ 3,LGWA 2,LGFC 2,-50,0,50,100,150,200,250,工作温度范围:,SKF 服务市场(2),deg.C,v 1.1,2/9,基油粘度的重要性:,轴承温度转速负荷,润滑油膜的厚度取决于:,基油粘度 是调整油膜
7、厚度的主要方式,v 1.1,2/10,选择基油粘度:,如:选择:高速;低负荷;低温低基油粘度低速;高负荷高基油粘度,粘度:应用:(at 40 C)(指标)10-25 cSt低温,高速70-200 cSt标准应用400-1000 cSt(非常)重负荷,(非常)低速,v 1.1,2/11,油脂的粘稠度:,粘稠度=坚硬的程度,粘稠度太低:油脂泄漏 搅动剧烈粘稠度太高:润滑不良 滚道体滑动,compare with butter,v 1.1,2/12,NLGI 粘稠度系数:,v 1.1,2/14,NLGI针入度外观 用途 系数*0.1 mm 000 445-475 流动性非常好 00 400-430
8、流动性好变速箱等0355-385 半流动性1310-340 非常软2265-295 软轴承3220-250 中等硬度4175-205硬5130-160 非常硬密封6 85-115 极硬,增稠剂 基油 温度范围 C 耐水性,钠基 矿物油-20 to 100 可溶于水锂基 矿物油-20 to 130 90 C以下耐水锂复合基矿物油-20 to 150 耐水钙基 矿物油-20 to 50 高度耐水铝基 矿物油-20 to 70 耐水复合钠基 矿物油-20 to 140 80 C以下耐水复合钙或 钡基 矿物油-20 to 140 高度耐水,油脂种类(1):,重要特性:,v 1.1,2/15,增稠剂 基
9、油 温度范围 C 耐水性,粘土基矿物油-20 to 150 耐水复合铝基矿物油-20 to 150 耐水 聚脲矿物油-20 to 150 耐水聚脲 SHC 合成油-40 to 160 耐水锂基双脂-50 to 110 耐水锂基 多脂-40 to 160 耐水锂基硅油-40 to 170 高度耐水,油脂种类(2):,重要特性:,v 1.1,2/16,重要的油脂特性:,工作温度范围:基油粘度:粘稠度:,v 1.1,2/4,一次性润滑密封轴承初始油脂选型非常重要间断性再润滑 开放式轴承咨询SKF/综合型录连续润滑 适用于对润滑要求极高的场合,或密封的目的,润滑模式:,v 1.1,2/24,在以下情况
10、下联系SKF:-关键应用-特种油脂-特殊应用条件(振动,污染等),利用再润滑周期表(SKF 综合型录)应用的限制条件:-正常运行条件-高质量锂基脂-运行温度不超过 70 C,再润滑周期:,v 1.1,2/25,取决于:-轴承转速(n)-轴承尺寸(d)-轴承形式,-适合 70 C以下 每升高 15 C,(110 C),油脂寿命减半-每降低 15 C 油脂寿命加倍,再润滑周期:,v 1.1,2/26,环保&安全:,v 1.1,2/27,安全:铅:无要求亚硝酸盐:无要求钡:需标注环保:一次性填充:减少油脂用量氯:难于处理可降解:对环保有要求时的 唯一选择,油脂性能:,油脂的性能是一种平衡:在油脂各种
11、性能的冲突中-高温和低温性能-温度限制和油脂寿命在油脂性能和成本之间-高性能意味着高成本,万能的油脂是不存在的!,必须根据应用选择最佳的油脂,v 1.1,2/28,在缺乏润滑知识的情况下选择油脂:,下列情况需要更多的知识:工作温度在 100 C 以上或 50 C以下轴承转速非常高或者非常低负荷非常高或振动负荷要求油脂有特殊特性(特别的耐水性,低阻力,低噪声，与其他油脂兼容等),v 1.1,3/4,油脂选择过程:,1选择粘稠度2是否需要 EP/固体添加剂3选择添加剂特性4选择基油粘度,推荐的选择过程,简单应用,v 1.1,3/5,1.选择粘稠度:,NLGI 2 grade:一般轴承应用NLGI
12、3 grade:大轴承,振动,高环境温度,垂直轴NLGI 1 grade:低环境温度,往复应用,当存在泵送问题时,选择:,v 1.1,3/6,2.是否需要EP/固体润滑:,需要EP添加剂-高负荷(C/P 5)-振动负荷-频繁起停机,需要固体润滑(石墨/MoS2)-轴承速度极低(n.dm 30,000 mm/min),v 1.1,3/7,只有在需要的情况下选择EP和固体添加剂!,3.选择油脂添加剂特性:,工作温度范围:添加剂+基油(超出-30 C to+120 C)耐水:添加剂 防锈:添加剂,增稠剂可降解:基油,在不需要特殊特性的情况下:选择锂基矿物油基油,对于:注意:,v 1.1,3/8,4
13、选择基油粘度(1):,SKF General Catalogue diagram,(using diagram from SKF General Catalogue),v 1.1,3/9,4 选择基油粘度(2):,(using diagram from SKF General Catalogue),转换 到要求的40 C下的粘度,SKF General Catalogue diagram,v 1.1,3/10,油脂填充数量:,开放式轴承:轴承必须 100%填满轴承座的其他空间填充 30-50%,密封轴承:一般填充=25-35%更高的填充量如果有防腐蚀的要求如果轴承转速非常低更少的填充量如果轴承
14、转速非常高,v 1.1,3/11,与其他油脂与保护剂与橡胶密封材料与保持架材料,油脂的兼容性:,v 1.1,3/12,油脂的兼容性(1):,与防护剂:,传统的聚脲基油脂与绝大部分防护剂均不兼容!当出现问题时，彻底清洁轴承并重新填充,与其他油脂:,检查增稠剂和基油的兼容性!利用兼容性列表不兼容并不总会引起问题 当出现问题时，彻底清洁轴承并重新填充,v 1.1,3/13,油脂的兼容性(2):,与保持架材料:,与橡胶密封:,含有脂类油的油脂通常与ACM 橡胶不兼容!SKF的密封与几乎所有的油脂都兼容.,含硫的 EP 与黄铜保持架在100 C以上会产生侵蚀.EP 添加剂在110 C以上会影响PA66的
15、保持架.,v 1.1,3/14,+=,兼容,-=,不兼容,o=需独立测试,Sodium complex,Lithium soap,Polyurea,Calcium soap,Calcium complex,Lithium complex,Aluminium complex,Sodium(Na)soap,Clay,Barium complex,Na compl.,Li soap,Polyurea,Ca soap,Ca compl.,Li compl.,Al compl.,Na soap,Clay,Ba compl.,+,o,+,-,-,o,+,+,-,-,+,+,-,+,+,+,+,-,-,-,
16、+,+,-,+,+,-,-,+,-,-,-,-,+,+,-,+,油脂的兼容性列表(1):,增稠剂,-,-,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,+,+,o,o,o,o,o,o,o,o,+,+,-,-,o,o,o,o,o,o,o,+,+,+,+,-,-,o,o,+,+,o,o,o,o,o,-,-,o,o,o,o,v 1.1,3/15,Polyphenylether,Mineral oil,Ester oil,Silicone:phenyl,Silicone:methyl,Polyglycol,Polyphenylether,Mineral oil
17、,Ester oil,Silicone:phenyl,Silicone:methyl,Polyglycol,+,+,-,-,+,+,-,-,+,-,-,-,-,-,-,+,+,-,-,+,+,+,-,-,+,+,油脂的兼容性列表(2):,基油,o,o,o,o,o,+,+,+,+,+,+,v 1.1,3/16,SKF 对轴承的润滑应用有最丰富的知识SKF 最有资格定义油脂的性能SKF 发展了最高质量的轴承润滑油脂SKF 能提供轴承和油脂的整体解决方案,选用 SKF 提供的油脂的益处:,SKF 是世界上最大的轴承供应商!,v 1.1,3/17,Hightemperatureabove120C,Be
18、aringworkingconditions,Lowtemperature,Very lowspeedand/oroscillatingmovements,Very highspeed,Low torqueand frictionrequirements,Rustinhibitingproperties,Heavyload,Waterresistance,Severevibration,LGMT2,LGMT3,LGHB2,LGEP2,LGEM2,LGEV2,LGFC2,LGWA2,LGLT2,LGHQ3,LGWM1,LGMB2,LGLC2,+,o,o,o,o,o,o,o,o,o,o,o,o,o
19、,o,o,-,-,-,-,-,-,+,+,-,-,-,-,o,o,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,+,o,o,o,o,o,o,o,o,+,+,+,+,+,+,+,+,o,o,o,o,+,+,+,+,+,+,+,+,+,服务市场的油脂选择指南(1):,v 1.1,3/18,SKF GREASETYPE,LGMT 2,LGMT 3,LGEP 2,LGWM 1,LGMB 2,LGHB 2,LGEM 2,DESCRIPTION,All purpose Industrial and Automotive,All purpose Industrial
20、 and Automotive,Extreme Pressure,Extreme Pressurelow temperature,EP high viscosity,EP high viscosityhigh temperature,High viscosity+solid lubricants,THICKENER/BASE OIL,Lithium soap/mineral oil,Lithium soap/mineral oil,Lithium soap/mineral oil,Lithium soap/mineral oil,Lithium soap/mineral oil,Lithium
21、-calciumsoap/mineral oil,Complex calciumsulfonate/mineral oil,BASE OILVISCOSITY,1),110,120,190,200,780,420,500,TEMPERATURERANGE,-30/+120 C-22/+250 F,-30/+120 C-22/+250 F,-20/+110 C-4/+230 F,-30/+110 C-22/+230 F,-20/+120 C-4/+250 F,-20/+150 C-4/+300 F,-20/+120 C-4/+250 F,AVAILABLEPACK SIZES,200g(7 oz
22、)tube,400g(14.1 oz)cartridge,1-5-18-50-180 kg(2.2-11-33-110-400 lb),400g(14.1 oz)cartridge,1-5-18-50-180 kg(2.2-11-33-110-400 lb),400g(14.1 oz)cartridge,1-5-50-180 kg(2.2-11-110-400 lb),400g(14.1 oz)cartridge,5-50-180 kg(11-110-400 lb),50-180 kg(110-400 lb),400g(14.1 oz)cartridge,1-5-18-180 kg(2.2-1
23、1-33-400 lb),18-50-180 kg(33-110-400 lb),Note 1):mm/s at 40 C/104 F=cSt,2,服务市场的油脂选择指南(2):,技术参数,v 1.1,3/19,服务市场的油脂选择指南(3):,技术参数,SKF GREASETYPE,LGEV 2,LGLT 2,LGLC 2,LGHQ 3,LGWA 2,LGFC 2,DESCRIPTION,Low temperaturehigh speed,Wide temperature,THICKENER/BASE OIL,Lithium-calciumsoap/mineral oil,Lithium so
24、ap/di-ester oil,Lithium complexsoap/mineral oil,TEMPERATURERANGE,-100/+120 C+14/+250 F,-55/+110 C-65/+230 F,-30/+150 C-22/+300 F,-20/+80 C-4/+230 F,AVAILABLEPACK SIZES,400g(14.1 oz)cartridge,1-5-18-180 kg(2.2-11-33-400 lb),5-50-180 kg(11-110-400 lb),380g(12.1 oz)cartridge,1 kg(2.2 lb),2),Food compat
25、ible,High temperature,Low temperature,Extremely high viscosity with solid lubricants,Note 1):mm/s at 40 C/104 F=cStNote 2):LGWA 2 can withstand peak temperatures of+220 C/428 F,2,-40/+120 C-40/+250 F,-30/+140 C-22/+284 F,Complex calciumsoap/ester+mineral oil,Lithium complexsoap/mineral oil,Calcium s
26、oap/vegetable oil,BASE OILVISCOSITY,1),200g(7 oz)tube,1-180 kg(2.2-400 lb),200g(7 oz)tube,1 kg(2.2 lb),200g(7 oz)tube,1-5-50-180 kg(2.2-11-110-400 lb),v 1.1,3/20,Temp,speed,Load,Main additional properties,greaserecomm.,M,MMLLVLELEL,MMHHVHVHVH,general purpose for small/medium sized bearingsgeneral pu
27、rpose for large bearingsEP/anti-wear,good corrosion inhibitionEP/anti-wear,good low temperature performance,anti-brinellingexcellent EP/anti-wear(in particular by solid additives)EP/anti-wear,good corrosion inhibitionexcellent EP/anti-wear(in particular by solid additives),LGMT 2LGMT 3LGEP 2LGWM 1LG
28、EM 2LGMB 2LGEV 2,LL+M,MEHVH,HLM,EP/anti-wear,food compatible(no low temperature start-up)quiet running,very low start-upEP/anti-wear,LGFC 2LGLT 2LGLC 2,H,HML,MHM,quiet running,leakage resistantEP/anti-wear,corrosion inhibitionleakage resistant,ability to withstand high peak temperatures,LGHQ 2LGHB 2
29、LGWA 2,快速油脂选择指南!,v 1.1,3/21,特性指标:,TempM=medium:-30 to+110 deg.CH=high:-20 to+130 deg.CW=wide:-40 to+140 deg.CL=low:-50 to+80 deg.C,SpeedEH=extremely high:n.dm over 700,000VH=very high:n.dm up to 700,000H=high:n.dm up to 500,000M=medium:n.dm up to 300,000L=low:n.dm below 100,000,Load:H=high:C/P 10,v
30、1.1,3/22,LGEP 2极压油脂,极低运行噪声.瑞典铁路部门选为最佳油脂.LGHB 2高温,高粘度油脂,具有极压特性而不含EP添加剂.LGEV 2极高粘度油脂,特为重工业应用而开发.采用固体添加剂 而在极低速度下有极为出色的性能.LGHQ 3专为需要低噪声运转的应用开发的高温油脂,几种特殊的 SKF 油脂:,v 1.1,3/23,SKF 油脂的速度特性指南:,Max.n.dm values mm/min,n.dm:n=speed(rev./min)dm=average of d and D(mm),v 1.1,3/25,免维护更多免维护（密封）轴承需要更长寿命的油脂降低噪音更多低噪声的轴
31、承需要低噪声油脂紧凑型设计更高的转速和温度要求更高性能的油脂,未来的轴承和润滑发展的方向:,轴承的趋势影响润滑的发展!,v 1.1,3/26,decisive,rust protection,water resistance and cost,substantial,pumpability,mechanical stability,b)load carrying ability,some,-,APPLICATION:Agricultural machinery 农机,typical bearing type/size,all/up to d=130 mm,operating temperatu
32、re range,M,operating speed,M,load,a)L,b)H,lubrication mode,relubricated,Recommended greases,a)LGMT 3,LGMT 2;b)LGEP 2,Relevant properties for grease,Application profile,v 1.1,3b/5,Application:metal casting 连铸,v 1.1,3b/6,decisive,rust protection,load carrying ability,high temperature application limit
33、,substantial,pumpability,water resistance,cost,some,copper inhibition,APPLICATION:Continuous Casting,high temperature area 连铸,高温区,typical bearing type/size,SRB,CRB,DGBB/d=50-160 mm,operating temperature range,VH(up to+150 C),operating speed,VL,load,VH,lubrication mode,relubricated(continuously),Reco
34、mmended greases,LGHB 2,Relevant properties for grease,Application profile,v 1.1,3b/7,decisive,rust protection,load carrying ability,water resistance,substantial,storage stability,some,-,APPLICATION:Dam gates 水闸,typical bearing type/size,SRB/see S-range publication,operating temperature range,M,opera
35、ting speed,VL,load,VH,lubrication mode,relubricated,Recommended greases,LGEP 2(100%grease fill),LGMB 2,Relevant properties for grease,Application profile,v 1.1,3b/8,decisive,quiet running,high base oil viscosity,substantial,corrosion protection,water resistance,some,-,APPLICATION:Electric motors,med
36、ium size,low speed 中型电机,低速,typical bearing type/size,DGBB/d=30-75 mm,operating temperature range,M,operating speed,VL,load,M,lubrication mode,relubricated(weekly),Recommended greases,LGEP 2,Relevant properties for grease,Application profile,v 1.1,3b/9,decisive,low temperature performance,pumpability
37、,substantial,corrosion protection,load carrying ability,some,cost,APPLICATION:Electric motors,large size 大型电机,typical bearing type/size,DGBB/d=75-200 mm,operating temperature range,M,operating speed,M,load,L/M,lubrication mode,relubricated(weekly),Recommended greases,LGEP 2,Relevant properties for g
38、rease,Application profile,v 1.1,3b/10,decisive,quiet running,high temperature performance,substantial,rust protection,leakage resistant,low cost,some,-,APPLICATION:Electric motors/small size,high temperature 小型高温电机,typical bearing type/size,DGBB/d=8-30 mm,operating temperature range,H,operating spee
39、d,L,load,L,lubrication mode,lubricated for life,Recommended greases,LGHQ 3,Relevant properties for grease,Application profile,v 1.1,3b/11,decisive,quiet,rust protection in contaminated air,alkaline water resistance,substantial,leakage resistance,low cost,long grease life,some,low friction torque,APP
40、LICATION:Electric motors/small size,agressive environment,typical bearing type/size,DGBB/d=8-30 mm,operating temperature range,M(-20 C),operating speed,L,load,L,lubrication mode,lubricated for life,Recommended greases,LGEP 2,Relevant properties for grease,Application profile,v 1.1,3b/12,decisive,qui
41、et running,long grease life,substantial,rust protection,water resistance,some,low cost,APPLICATION:Electric motors/medium size,normal conditions,typical bearing type/size,DGBB/d=30-75 mm,operating temperature range,M,operating speed,M,load,L,lubrication mode,lubricated for life,Recommended greases,L
42、GHQ 3,Relevant properties for grease,Application profile,v 1.1,3b/13,decisive,quiet running,leakage resistance,substantial,fretting protection,some,-,APPLICATION:Electric motors/medium size,vibrating conditions,typical bearing type/size,DGBB/d=30-75 mm,operating temperature range,M,operating speed,M
43、,load,L,lubrication mode,lubricated for life,Recommended greases,LGHQ 3,Relevant properties for grease,Application profile,v 1.1,3b/14,decisive,load carrying ability,high base oil viscosity,substantial,rust protection,pumpability,some,leakage resistance(rolling),water resistance,APPLICATION:High pre
44、ssure twin-roll Grinding Mills 高压双辊碾磨机,typical bearing type/size,SRB,CRB/d=200-1600 mm,operating temperature range,M,operating speed,VL,load,H(accelerations up to 20 g),lubrication mode,relubricated,Recommended greases,LGEV 2,Relevant properties for grease,Application profile,v 1.1,3b/15,decisive,lo
45、ad carrying ability,high base oil viscosity,mechanical stability,substantial,rust protection,pumpability,some,leakage resistance(rolling),water resistance,APPLICATION:Hammer mills/Jaw crushers 锤磨机,爪式破碎机,typical bearing type/size,SRB(CRB)/d=200-1600 mm,operating temperature range,M,operating speed,M,
46、load,H,lubrication mode,relubricated,Recommended greases,LGEM 2,LGHB 2,Relevant properties for grease,Application profile,v 1.1,3b/16,decisive,long grease life(despite oil loss due to recess),substantial,rust protection,compatibility with NBR and ACM rubbers,some,quiet running,APPLICATION:Outer ring
47、 rotation,(belt tension units,clutch release b.,typical bearing type/size,DGBB/20-50 mm,operating temperature range,H,operating speed,H of outer ring,load,L,lubrication mode,lubricated for life,Recommended greases,LGHQ 3,Relevant properties for grease,Application profile,v 1.1,3b/17,decisive,frettin
48、g protection against false brinelling,substantial,-,some,-,APPLICATION:Oscillatory applications,general 往复应用,typical bearing type/size,any,operating temperature range,M,operating speed,EL,load,L/H,lubrication mode,lubricated for life,relubricated,Recommended greases,LGHB 2,Relevant properties for gr
49、ease,Application profile,v 1.1,3b/18,wet section,dry section,Yankeecylinder,Calenderrolls,Application:paper making,wet&dry section,v 1.1,3b/19,decisive,rust protection,substantial,water resistance,base oil viscosity,some,APPLICATION:Paper making machines-wet section,typical bearing type/size,SRB,ope
50、rating temperature range,M,operating speed,L,load,L,lubrication mode,relubricated(weekly),Recommended greases,LGEP 2,Relevant properties for grease,Application profile,v 1.1,3b/20,decisive,high temperature performance,substantial,high base oil viscosity(400 mm2/s at 40 C),consistency NLGI 2,some,-,A
