iglidur® A181 - Material data

Material table

Genera l features	Unit	iglidur® A181	test method
Density	g/cm³	1,38
Colour		blue
Max. humidity absorption at 23°C/50% R. H.	% weight	0,2	DIN 53495
Max. water absorption	% weight	1,3
Coefficient of surface friction, dynamic, against steel	µ	0,10 - 0,21
pv values (dry)	MPa x m/s	0,31
Mechanical properties
Bending E-module	MPa	1.913	DIN 53457
Tensile strength at +20 °C	MPa	48	DIN 53452
compressive strength	MPa	60
Maximum recommended surface pressure (20° C)	MPa	31
Shore D-hardness		76	DIN 53505
Physical and thermal properties
Max. long term application temperature	°C	+90
Max. short term application temperature	°C	+110
Minimum application temperature	°C	-50
thermal / heat conductivity	[W/m x K]	0,25	ASTM C 177
Coefficient of thermal expansion (at 23° C)	[K^-1 x 10^-5]	11	DIN 53752
Electrical properties
Specific forward resistance	Ωcm	< 10¹²	DIN IEC 93
surface resistance	Ω	< 10¹²	DIN 53482

Table 01: Material properties

Fig. 01: Permitted PV values for iglidur® A181 plain bearings with 1 mm wall thickness in dry-running operation against a steel shaft, at +20°C, installed in a steel housing

X = gliding speed [m/s]
Y = load [MPa]

Due to their technical characteristics and compliance with applicable regulations, iglidur® A181 plain bearings are predestined for use in food technology applications. Directly comparable to iglidur® A180 with respect to temperature and media resistance, iglidur® A181 represents yet another improvement with respect to wear resistance in most applications.

Figure 02: Maximum recommended surface pressure dependent on the temperature (31 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]

Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformatio [%]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® A181 plain bearings decreases. Fig. 02 clarifies this connection. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.

Figure 03 shows the elastic deformation of iglidur® A181 with radial loads.

m/s	Rotary	oscillating	Linear
Constant	0,8	0,6	3,5
Short-term	1,2	1,0	5,0

Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® A181 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 3.5 m/s (linear) respectively are permitted for continuous application in dry operation. The values specified in Table 02 state the limits to which the long-term permitted temperature rises due to friction heat. In practice these limit values are not always reached due to interactions.

Surface speed

p x v value and lubrication

iglidur® A181	Application temperature
Lower	- 50 °C
Upper, long-term	+ 90 °C
Upper, short-term	+ 110 °C
Secure axially in addition	+ 60 °C

Table 03: Temperature limits

Temperatures

The upper long-term application temperature of +90°C allows for a variety of applications in the food industry. As Fig. 02 shows, the compressive strength decreases with increasing temperatures. The additional friction heat in the bearing system should be considered in the temperature observations. An additional securing is recommended at temperatures higher than +60°C.

Temperatures, coefficient of thermal expansion

Figure 04: Coefficients of friction dependent on the surface speed, p = 1 MPa

X = Sliding speed [m/s]
Y = Coefficient of friction μ

Figure 05: Coefficients of friction dependent on the load, v = 0,01 m/s

X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

Coefficient of friction and wear resistance alter with the application parameters(Fig. 04 and 05). In the iglidur® A181 plain bearings, the alteration of the friction coefficient µ dependent on surface speed and the shaft's surface finish is only negligently pronounced.

iglidur® A181	Dry	Grease	Oil	Water
Coefficients of friction µ	0,10 - 0,21	0,08	0,03	0,04

Table 04: Coefficients of friction against steel (Ra = 1 µm, 50 HRC)

Coefficients of friction

Wear resistance

Fig. 06: Wear, rotating application with various

Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s

X = Shaft material
Y = Wear [μm/km]

A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

shaft materials

Figure 06 displays a summary of the results of tests with different shaft materials, which were conducted with iglidur® A181 plain bearings. Special emphasis is given to the corrosion-resistant shaft types in thefood industry. Fig. 06 shows that low wear rates can be achieved especially in combination with these shafts. As in many iglidur® materials, the wear rate increases in rotation with otherwise identical parameters (Fig. 07).

Shaft materials

Fig. 07: Wear in oscillating and rotating applications with Cf53 shaft material depending

A = rotating
B = oscillating on the load

X = load [MPa]
Y = wear [μm/km]

Medium	Resistance
Alcohols	+
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted bases	+
Strong bases	+ to 0

+ resistant 0 limited resistance - unresistant
All specifications at room temperature[+20 °C]
Table 05: resistant to chemicals

Electrical properties

Specific forward resistance	< 10¹² Ωcm
Surface resistance	< 10¹² Ω

iglidur® A181 bearings are electrically insulating.

Chemical resistance

iglidur® A181 bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 05 gives an overview of the chemical resistance of iglidur® A181 bearings at room temperature.

Radioactive rays

iglidur® A181 bearings are radiation resistant up to a radioactive intensity of 2 · 10² Gy.

UV-resistant

iglidur® A181 bearings are permanently resistant against UV rays.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only dry bearings are suitable for vacuum.

Total moisture absorption for iglidur A181

Maximum moisture absorption
by +23 °C/50 % r. F.	0,2 weight-%
Max. water absorption	1,3 weight-%

Table 06: Moisture absorption

Moisture absorption

The iglidur® A181 bearings absorb up to 0.2% water through atmospheric humidity (+23°C, 50% relative atmospheric humidity), when saturated with water they absorb 1.3%.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A181 F10 [mm]	Housing H7 [mm]
Up to 3	0 - 0,025	+0,014 +0,054	0 +0,010
> 3 to 6	0 - 0,030	+0,020 +0,068	0 +0,012
> 6 to 10	0 - 0,036	+0,025 +0,083	0 +0,015
> 10 to 18	0 - 0,043	+0,032 +0,102	0 +0,018
> 18 to 30	0 - 0,052	+0,040 +0,124	0 +0,021
> 30 to 50	0 - 0,062	+0,050 +0,150	0 +0,025
> 50 to 80	0 - 0,074	+0,060 +0,180	0 +0,030
> 80 to 120	0 - 0,087	+0,072 +0,212	0 +0,035
> 120 to 180	0 - 0,100	+0,085 +0,245	0 +0,040

Table 07: Important tolerances iaw. ISO 3547-1 after press-fitting.

Installation tolerances

Iglidur® A181- bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the E10 tolerance.

คุกกี้มีความสำคัญเพราะจะช่วยให้เว็บไซต์ปฏิบัติงานได้ถูกต้องเหมาะสมเพื่อให้เราสามารถเสนอประสบการณ์การใช้งานที่น่ารื่นรมย์ยิ่งขึ้น เราจึงต้องใช้คุกกี้เพื่อเก็บข้อมูลของท่าน ซึ่งจะช่วยให้เราสามารถเสนอการล็อกอินเข้าสู่ระบบที่ปลอดภัย สามารถรวบรวมข้อมูลทางสถิติเพื่อการใช้งานเว็บไซต์ที่ดียิ่งขึ้น รวมทั้งสามารถเสนอเนื้อหาที่ตรงกับความต้องการของท่านได้ กรุณาคลิกที่ "นโยบายการคุ้มครองข้อมูลส่วนบุคคล“เพื่อดูรายละเอียดเกี่ยวกับประเภทของคุกกี้ที่เราใช้และดูข้อมูลตัวเลือกต่างๆในกรณีที่ท่านต้องการถอนสิทธิ์.

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iglidur® A181 - Material data

Material table

Mechanical properties

Permitted surface speeds

Temperatures

Friction and wear

shaft materials

Electrical properties

Chemical resistance

Radioactive rays

UV-resistant

Vacuum

Moisture absorption

Installation tolerances

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เรายินดีให้คำปรึกษากับคุณ

จัดส่งและให้คำปรึกษา

โปรดเลือกที่อยู่การจัดส่ง

iglidur® A181 - Material data

Material table

Mechanical properties

Permitted surface speeds

Temperatures

Friction and wear

shaft materials

Electrical properties

Chemical resistance

Radioactive rays

UV-resistant

Vacuum

Moisture absorption

Installation tolerances

ที่ปรึกษาและการสนับสนุน

เรายินดีให้คำปรึกษากับคุณ

จัดส่งและให้คำปรึกษา

ประเทศ/ภูมิภาค

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