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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747

+1 401 438 7270

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iglide® N54 - Material data

Materials table

General features	Unit	iglide® N54	test method
Density	g/cm³	1.13
Color		green
Max. moisture absorption at 73°F/50% R. H.	Wt.-%	1.6	DIN 53495
Max. moisture absorption	Wt.-%	3.6
Coefficient of surface friction, dynamic, against steel	μ	0.15–0.23
P x v value, max. (dry)	psi x fpm	14,000
Mechanical properties
Modulus of elasticity	psi	261,000	DIN 53457
Tensile strength at 68° F	psi	10,150	DIN 53452
Compressive strength	psi	4,351
Maximum recommended surface pressure (68° F)	psi	8,700
Shore D hardness		74	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	176
Upper short-term application temperature	°F	248
Lower application temperature	°F	-40
Thermal conductivity	W/m x K	0.24	ASTM C 177
Coefficient of thermal expansion (at 73° F)	K^-1 x 10^-5	9	DIN 53752
Electrical properties
Specific volume resistance	Ωcm	< 10¹³	DIN IEC 93
Surface resistance	Ω	< 10¹¹	DIN 53482

Permissible p x v values for iglide® N54 plastic bushings running dry against a steel shaft, at 68°F

Permitted p x v values

For iglide® N54 plastic bushing with 0.03 inches (1 mm) wall thickness under dry running conditions against a steel shaft, at 68°F, installed into a steel housing.

Deformation under load and temperature

Compressive Strength

iglide® N54 is the first iglide® material based largely in biopolymers. In addition to the already assured lubricant-free properties of iglide® materials, this is one further contribution to positive environmental stewardship. The good coefficients of friction in conjunction with holding times ensure that these materials have a permanent place in the iglide® product range.

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. The compressive strength of iglide® N54 plastic bushings decreases with increasing temperatures. The graph clarifies this relationship. At the long-term permitted application temperature of 248°F, the permitted surface pressure still amounts to 210,000.

Surface pressure, load

fpm	Rotary	Oscillating	Linear
Constant	157	118	197
Short-term	295	216	393

Permitted surface speeds

Even if the typical applications for iglide® N54 plastic bushings are more commonly for intermittent service, depending on the type of motion, the maximum attainable speeds can be quite high. The speeds stated in table are limit values for the lowest bearing loads. As loads increase, the admissible speed is reduced with higher loads due to the limitations of the pv value.

Surface speed

p x v value, lubrication

Recommended maximum permissible static surface pressure of iglide® N54 as a result of the temperature

Temperatures

The short-term admissible temperature limit is +248 °F, thus permitting the use of iglide® N54 plastic bushings in all applications with elevated ambient temperatures. However, the compressive strength of iglide® N54 plastic bushings decreases as temperatures increase. The additional frictional heat in the bushing system should be taken into account when considering the temperature limits.

iglide® N54	Application temperature
Lower	- 40 °F
Upper, long-term	+ 176 °F
Upper, short-term	+ 248 °F
Additional axial securing	+ 122 °F

Temperature limits for iglide® N54

Temperature

Coefficients of friction dependent on the surface speed

Coefficients of friction of iglide® N54 as a function of the running speed; p = 145 psi

Friction and wear

iglide® N54 has a low coefficient of friction. However it must be noted that a gliding partner with a rough surface finish increases the friction. We recommend shaft surface finishes 4 to 16 rms.

The coefficient of friction of iglide® N54 plastic bushings is only marginally dependent on the surface speed.

The influence of the load is greater; an increase in load lowers the coefficient of friction up to 0.08.

Coefficients of friction for iglide® N54 against steel
(Shaft finish = 40 rms, 50 HRC)


iglide® N54	Dry	Grease	Oil	Water
Coefficients of friction µ	0.15 - 0.35	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Coefficient of friction of iglide® N54 as a function of the load, v = 1.96 fpm

Coefficients of friction dependent on the shaft surface

Coefficient of friction of iglide® N54 as a function of the shaft surface (1050 hard chromed and ground steel)

Wear of iglide® N54, rotating applications with different shaft materials, p = 145 psi, v = 59 fpm

Shaft materials

It is important to select a suitable shaft material. As a rule, iglide® N54 is better suited for hard or soft shafts, but hard shaft surfaces tend to have better holding times. Starting at loads of 145 psi, wear increases measurably and continuously.

Shaft materials

Wear of iglide® N54 with different shaft materials in rotational applications, as a function of the pressure

Wear of oscillating and rotating applications with shaft material 1050 hard chromed and ground steel, as a function of the pressure

Medium	Resistance
Alcohols	+ to 0
Hydrocarbons, chlorinated	+
Greases, oils, without additives	+
Fuels	+
Weak acids	0 to +
Strong acids	-
Weak alkaline	+
Strong alkaline	0

+ resistant 0 conditionally resistant - non-resistant
All specifications at room temperature (+68 °F)
Chemical resistance of iglide® N54

Electrical properties

Specific volume resistance	< 10¹³ Ωcm
Surface resistance	< 10¹¹ Ω

Chemical Resistance

iglie® N54 plastic bushings have good resistance to chemicals. They are resistant to most lubricants. iglide® N54 is not impaired by most weak organic and inorganic acids and bases.

Radioactive rays

iglide® N54 plastic bushings can be used with restrictions when exposed to radiation. They are resistant up to a radiation intensity of 1 x 10⁴ Gy.

UV-resistant

iglide® N54 plastic bushings are resistant to UV rays.

Vacuum

The low water elements degas in the vacuum. Applications under vacuum conditions are possible with restrictions.

Electrical properties

iglide® N54 plastic bushings are electrically insulating.

Influence of moisture absorption on iglide® N54 plastic bushings

Moisture Absorption

The moisture absorption of iglide® N54 plastic bushings is about 1.6% in standard climatic conditions. The saturation limit in water is 3.6 %.

Diameter d1 [mm]	Shaft h9 [mm]	iglide® N54 E10 [mm]	Housing H7 [mm]
Up to 3	0 - 0,025	+0,014 +0,054	0 +0,010
> 3 bis 6	0 - 0,030	+0,020 +0,068	0 +0,012
> 6 bis 10	0 - 0,036	+0,025 +0,083	0 +0,015
> 10 bis 18	0 - 0,043	+0,032 +0,102	0 +0,018
> 18 bis 30	0 - 0,052	+0,040 +0,124	0 +0,021
> 30 bis 50	0 - 0,062	+0,050 +0,150	0 +0,025
> 50 bis 80	0 - 0,074	+0,060 +0,180	0 +0,030

Table 07: Important tolerances for iglide® N54 pastic bushings according to ISO 3547-1 after the press-in

Installation tolerances

iglide® UW plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

The bushings 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 bushing automatically adjusts to the E10 tolerance.

Tolerances