Polyurethane roller sleeves, also known as TPU sheaths, are made of thermoplastic polyurethane (TPU) and feature high flexibility, elasticity and excellent wear resistance, capable of withstanding continuous friction during the operation of roller conveying systems.

Dimensions of Polyurethane roller sleeves

1. Inner Diameter: Precise inner diameter is crucial to ensure a proper fit on the roller. Polyurethane sleeves have a certain elongation rate, so usually the inner diameter of polyurethane sleeves is 1-2mm smaller than the outer diameter of steel rollers. Only after installing the TPU sheaths in this way can it be ensured that the polyurethane sleeve can be tightly fitted onto the conveyor roller.
2. Outer Diameter: The outer diameter determines the effective surface area of the sleeve in contact with the conveyed materials. It is designed according to the specific requirements of the application, considering factors like the size of the products being transported and the required grip.
3. Length: The length of roller sleeves can be cut as per your requirements, such as 1M, 2M, and 3M. Other lengths can be packaged into rolls for convenient transportation.

Physical Properties of Urethane Rollers Sleeves

1. Hardness: The hardness of the polyurethane sleeves can be adjusted according to the application. For applications that require a strong grip, a harder shore hardness (e.g., 85 - 90 Shore A) may be chosen. For more delicate handling or shock - absorbing purposes, a softer hardness (e.g., 40 - 60 Shore A) is preferred.
2. Tensile Strength: Polyurethane sleeves generally have high tensile strength, which ensures they do not break or tear under normal operating loads. Tensile strength values can range from 10 - 30 MPa depending on the specific formulation of the polyurethane.
3. Elongation at Break: They also exhibit good elongation at break properties, typically ranging from 300% - 600%. This allows the sleeves to stretch slightly under stress without rupturing.

Chemical Properties of Urethane Rollers Sleeves

1. Resistance to Oils and Greases: Polyurethane roller sleeves are highly resistant to oils and greases commonly found in industrial environments. This property ensures that the sleeves maintain their performance even when exposed to lubricants used in machinery.
2. Chemical Agents: They can also withstand exposure to various chemical agents such as mild acids and alkalis. However, the level of resistance may vary depending on the concentration and type of chemicals. For example, they can tolerate diluted cleaning solutions used in food processing plants without degradation.

Working Temperature Range of Urethane Roller Sleeves

Polyurethane roller sleeves can operate within a relatively wide temperature range. They can withstand low temperatures down to - 20°C without becoming brittle and can handle high temperatures up to 80°C in many cases. In some specialized formulations, they can even endure higher temperatures for short periods.

Performance Data of Thermoplastic Polyurethane Elastomers Material S1190

Material properties	Test standard	Unit	Physical value
Density	ASTM D792	g/cm³	1.2
Shore Hardness	ASTM D2240	Shore A	92
100% Modulus	ASTM D412	Mpa	8.97
300% Modulus	ASTM D412	Mpa	29.38
UV class	A method 48H	Class	2.5
Tensile strength	ASTM D412	Mpa	53.93
Elongation at break	ASTM D412	%	413.34
Tear strength	ASTM D642	N/mm	126.33
Precipitation	Temperature 75 Humidity 75 24H		Light

Performance Data of Polyester polyol/TDI series prepolymer Material

Model	D3136	D3145	D3160
NCO content / %	3.6±0.1	4.5±0.2	6.0±0.2
State of matter At 20℃	White waxy solid	White waxy solid	White waxy solid
MOCA 100g prepolymer dosage /g	10.5	13.2	17.2
Viscosity(85℃)/ mpa * s	1800	1200	900
Mixing Temperature /℃(prepolymer/MOCA)	85/120	80/120	75/120
Gel time /min	9	7.5	5
Post vulcanization time (100℃)/h	10	10	10
Hardness ( shore A)	85±1	91±1	96A±1 (54D)
100% constant tensile stress /MPa	4.2	6.7	11.5
300% constant tensile stress /MPa	8.3	12.5	21.3
Tensile strength /MPa	48	52	55
Elongation at break / %	670	610	530
Tear strength (right angle) /(KN/m)	75	95	124
Tear strength (pants type) /(KN/m)	34	42	49
Rebound /%	39	32	33
Density (25℃)/(g/cm)	1.26	1.27	1.29
wearing out by friction mm³	40	48	57