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الشحم هو :
تكوين صلب أو شبه سائل نتيجه لتشتيت ماده مثخنه للقوام فى زيت
)كالأسفنجه فى الماء (
إستخدام الشحم للاغراض التالية :
(الألات التى تتعرض للأتربه والرطوبه
– الأماكن التى يحدث فيها تسريب للزيوت
– عدم كفايه كميه الزيت
– عدم مناسبه لزوجه الزيت فى بعض الأماكن
-الاماكن التي تعمل في ظروف( إرتفاع الأحمال وإرتفاع السرعه )
– مكونات الشحم (صابونه + زيت أساسى + إضافات )
انواع الإضافات (أقصى ضغط – مقاومه الأكسده – مقاومه للتأكل – مقاومه للصدأ – مقومه للإلتصاق )
4- أنواع الشحوم (كالسيومى – ليثيومى – صوديومى – سليكونى )
1- الشحم الكالسيومى ( قوامه زبدى وناعم -غير قابل للذوبان فى الماء – يستخدم فى تشحيم الكراسى البسيطه – درجه حرارة التشغيل 60م – درجه التنقيط من 90م : 100م)
2- الشحم الصوديومى ( قوامه ليفى مطاط – قابل للذوبان فى الماء – يستخدم فى تشحيم كراسى البلى والبلح – درجه حرارة التشغيل 80م – درجة التنقيط من 130م : 150م )
3- الشحم الليثيومى ( قوامه ناعم – مقاوم للماء والرطوبة – درجة حرارة التشغيل حتى 130م – درجة التنقيط من 160م : 180م – يستخدم فى تشحيم كراسى البلى والبلح فى مدى واسع من درجات الحرارة والسرعات العالية) ويعتبر الشحم الليثيومى هو الأكثر إستخداما عن الشحوم الأخرى
4- الشحم السليكونى :- لايستخدم فى تركيبه الصابونه العادية كما فى الشحوم الأخرى ولكن يستخدم السليكون لتثخين الزيت ليعطى نفس شكل الشحم (زيت + سليكون ) ويستخدم فى درجة حرارة تصل أعلى من 250م وايضا مقاوم للماء ويستخدم فى السرعات العالية
هى قياس مدى صلابة الشحم او ليونته وتعرف درجة الغرز بأنها المسافة (بوحدة 1, مم ) التى ينغرز فيها مخروط قياس فى الشحم تحت تأثير وزنة والجاذبية الأرضية لمدة 5 ثوان عند 25م ( الشحم الطرى غرزه كبير / الشحم الناشف غرزه قليل ) ثم يجرى الأختبار بعد تشغيل الشحم 60 شوطا
Mobilgrease XHP™ 460 Series
Product Description
Mobilgrease XHP™ 460 greases are extended service lithium complex greases intended for a wide variety of heavy duty applications and operating conditions. These greases were designed to outperform conventional products by applying high performance proprietary lithium complex manufacturing technology. They are formulated to provide excellent high temperature performance with excellent adhesion, structural stability and resistance to water contamination. These greases have a high level of chemical stability and offer excellent protection against rust and corrosion. These greases feature high dropping points and maximum recommended operating temperature of 140º C (284°F). Mobilgrease XHP 460 greases are formulated with an ISO VG 460 base oil viscosity and are available in NLGI grades 1 and 2. Mobilgrease XHP 462 Moly is fortified with 3% molybdenum disulfide to provide enhanced EP and AW protection in heavily loaded and high sliding applications.
Mobilgrease XHP 460 greases are designed for a wide range of applications including the industrial, automotive, construction and marine sectors. Their performance features make them ideal choices for operating conditions including high temperature, water contamination, shock loading and extended re-lubrication operations. Mobilgrease XHP 462 Moly is an extreme pressure grease containing 3% molybdenum disulfide that provides protection from wear under pivoting and other heavily loaded sliding conditions that lead to lose of oil film.
Features and Benefits
Mobilgrease XHP 460 greases are leading members of the Mobilgrease brand of products. Mobilgrease XHP 460 greases are designed by our formulation technologists and backed by our world-wide technical support staff.
A key factor in the excellent adhesion and cohesion properties and mechanical stability of the thickener of Mobilgrease XHP 460 greases is the proprietary manufacturing technology developed at our research facilities and adopted by our modern manufacturing facilities. These products use specially selected additives to provide excellent oxidation stability, rust and corrosion control, resistance to water contamination as well as anti-wear and EP protection. Mobilgrease XHP 460 Series products offer the following features and potential benefits:
Features | Advantages and Potential Benefits |
Superb resistance to water washout and spray-off | Helps to assure proper lubrication and protection even in the most severe water exposure conditions |
Highly adhesive and cohesive structure | Excellent grease tenacity helps reduce leakage and extend re-lubrication intervals to help reduce maintenance requirements. |
Excellent rust and corrosion resistance | Protection of lubricated parts even in hostile aqueous environments. |
Very good resistance to thermal, oxidative and structural degradation at high temperature | Helps extend grease life and enhance bearing protection in high temperature applications and offers reduced maintenance and replacement cost benefits. |
Very good anti-wear and EP performance | Reliable protection of lubricated equipment, even under conditions of high sliding with potential for extended equipment life and reduced unanticipated downtime |
Broad multi-purpose application | Provides potential for inventory rationalization and reduced inventory costs |
Applications
Mobilgrease XHP 460 greases are used in a wide range of equipment including industrial, automotive, construction and marine applications. The blue color of Mobilgrease XHP 461 and 462 enables easy verification of application. With its high, ISO VG 460 base oil viscosity, these greases are recommended for high load applications at slow-to-moderate speeds, including most bearing applications in the paper, construction, and mining industries, as well as off-highway vehicles.
Specific applications:
Specifications and Approvals
Mobilgrease XHP 460 Series meets or exceeds the requirements of | 461 | 462 | 462 Moly |
DIN 51825: (2004-06) | KP1N-20L | KP2N-20L | — |
Typical Properties
Mobilgrease XHP | 461 | 462 | 462 Moly |
NLGI Grade | 1 | 2 | 2 |
Thickener Type | Li-Complex | Li-Complex | Li-Complex |
Color, Visual | Dark Blue | Dark Blue | Grey |
Molybdenum Disulfide, wt%, | — | — | 3% |
Penetration, Worked, 25º C, ASTM D 217 | 325 | 280 | 280 |
Dropping Point, ºC, ASTM D 2265 | 280 | 280 | 280 |
Viscosity of Oil, ASTM D 445 |
|
|
|
cSt @ 40º C | 460 | 460 | 460 |
4-Ball Wear Test, ASTM D 2266, scar, mm | 0.50 | 0.50 | 0.50 |
4-Ball Weld Load, ASTM D 2509, Kg | 315 | 315 | 315 |
Timken OK Load, ASTM D 2509, lb | 50 | 50 | 50 |
Bomb Oxidation, ASTM D 942, Pressure drop at 100 hrs, kPa (psig) | 13.8 (2) | 13.8 (2) | — |
Corrosion Prevention, ASTM D 1743 | Pass | Pass | Pass |
Rust Protection (EMCOR), IP 220-mod/ASTM D 6138., Distilled Water | 0,0 | 0,0 | 0,0 |
Copper Strip Corrosion, ASTM D 4048 | 1a | 1a | 1a |
Penetration Consistency Change, Roll Stability, ASTM D 1831, mm/10 | -5 | -5 | -5 |
Health and Safety
Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS’s are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.
Mobilith SHC™ Series greases are superior performance products designed for a wide variety of applications at extremes of temperature. They combine the unique features of synthetic base fluids with those of a high quality lithium complex thickener. The wax-free nature of synthetic fluids and the low coefficient of traction (compared with mineral oils), provide excellent low temperature pumpability and very low starting and running torque. These products offer the potential for energy savings and can reduce operating temperatures in the load zone of spherical roller and ball bearings. The lithium complex thickener contributes excellent adhesion, structural stability and resistance to water. The greases have a high level of chemical stability and are formulated with special additive combinations to provide excellent protection against wear, rust and corrosion, and providing operating viscosity at high and low temperatures. Mobilith SHC Series greases are available in seven grades, varying in base oil viscosity from ISO VG 100 to 1500 and in NLGI grade from 2 to 00.
Mobilith SHC Series greases have become the products of choice for many users, in many industries worldwide. Their reputation is based on their exceptional quality, reliability, versatility and the performance benefits they deliver.
The Mobil SHC brand of oils and greases are recognized and appreciated around the world for their innovation and outstanding performance. The Mobilith SHC series symbolizes ExxonMobil’s continued commitment to using advanced technology to provide outstanding products. A key factor in the development of the Mobilith SHC Series were the close contacts between our scientists and application specialists with key Original Equipment Manufacturers (OEMs) to ensure that our product offerings would provide exceptional performance in the continually evolving industrial equipment designs.
Our work with equipment builders has helped confirm the results from our own laboratory tests showing the exceptional performance of the Mobilith SHC Series lubricants. These benefits include longer grease life, enhanced bearing protection and bearing life, wide temperature range of application, and the potential for improved mechanical efficiency and energy savings.
To combat high thermal exposure of the oil our product formulation scientists chose proprietary synthetic base oils for Mobilith SHC Series oils because of their exceptional thermal/oxidative resistance potential. Our scientists developed a state-of-the-art lithium complex thickener technology and used specific additives to enhance the performance of each grade of the Mobilith SHC Series product family. The Mobilith SHC Series greases offer the following features and benefits:
Features | Advantages and Potential Benefits |
Outstanding high temperature and low temperature performance | Wide application temperature ranges, with excellent protection at high temperatures and low torque, easy start-up at low temperatures |
Excellent protection against wear, rust and corrosion | Reduced downtime and maintenance costs because of reduced wear, rust and corrosion |
Excellent thermal stability and oxidation resistance | Extended service life with longer intervals between relubrication and improved bearing life |
Low traction coefficient | Potential to improve mechanical life and reduced energy consumption |
Includes both high and low viscosity grades | Options for outstanding protection of slow speed, heavily loaded bearings, and options for good low temperature performance |
Outstanding structural stability in the presence of water | Retains excellent grease performance in hostile aqueous environments |
Low volatility | Helps resists viscosity increase at high temperatures to maximize relubrication intervals and bearing life |
Application Considerations: While Mobilith SHC Series greases are compatible with most mineral oil based products, admixture may detract from their performance. Consequently it is recommended that before changing a system to one of the Mobilith SHC Series, it should be thoroughly cleaned out to achieve the maximum performance benefits. While the Mobilith SHC Series greases share many performance benefits, their applications are best described in terms of each product grade:
*Low temperature claims based on ASTM D 1478 results vs. maximum limits of 10,000 / 1000 gcm @ startup and 1 hour respectively.
Mobilith SHC Series meets or exceeds the requirements of: | 100 | 220 | 221 | 460 | 1000 Special | 1500 | 007 |
DIN 51825: (2004-06) | KPHC 2N-40 | KPHC 2N-30 | – | KPHC 1-2N-40 | KPFHC 2N-30 | KPHC 1-2N-30 | – |
DIN 51826: (2005-01) | – | – | – | – | – | – | GPHC 00K-30 |
Mobilith SHC Series has the following builder approvals: | 100 | 220 | 221 | 460 | 1000 Special | 1500 | 007 |
AAR-942 | X | – | X | – | – | – | – |
MAG IAS, LLC | P-73 |
|
| P-64 |
|
| P-81 |
Mobilith SHC Series | 100 | 220 | 221 | 460 | 1000 Special | 1500 | 007 |
NLGI Grade | 2 | 2 | 1 | 1.5 | 2 | 1.5 | 00 |
Thickener Type | Lithium Complex | Lithium Complex | Lithium Complex | Lithium Complex | Lithium Complex | Lithium Complex | Lithium Complex |
Color, Visual | Red | Red | Light Tan | Red | Grey Black | Red | Red |
Penetration, Worked, 25ºC, ASTM D 217 | 280 | 280 | 325 | 305 | 280 | 305 | 415 |
Dropping Point, ºC, ASTM D 2265 | 265 | 265 | 265 | 265 | 265 | 265 | – |
Viscosity of Oil, ASTM D 445 cSt @ 40ºC | 100 | 220 | 220 | 460 | 1000 | 1500 | 460 |
4-Ball Weld, ASTM D 2596, Load, Kg | 250 | 250 | 250 | 250 | 620 | 250 | 250 |
Water Washout, ASTM D 1264, 79 ºC, % Wt. Loss | 6 | 3 | 4 | 3 | 2.6 | 2.5 | – |
Rust Protection, ASTM D 6138, Distilled Water | 0,0 | 0,0 | 0,0 | 0,0 | 0,0 | 0,0 | – |
Corrosion Protection, ASTM D 1743, Rating | Pass | Pass | Pass | Pass | Pass | Pass | – |
4-Ball Wear, ASTM D 2266, Scar, mm | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 |
Low Temperature Torque, ASTM D 1478, Torque @ Startup/1 Hour in gcm and Test Tº | 9520/2199 @ -50 ºC | 4361/836 @ -40 ºC | —- | 9060/2944 @ -40 ºC | —- | 1874/‹1000 @ -20 ºC | —- |
U.S. Mobility, AM-S 1390, -18 ºC, gms/min | 20.0 | 11.0 | —- | 5.0 | —- | 3.0 | —- |
Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS’s are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.