EP/NN Conveyor Belt

EP/NN conveyor belts are multi-ply rubber conveyor belts reinforced with textile fabric for general-purpose and heavy-duty bulk material handling. Two carcass constructions are available: EP uses polyester yarns in the longitudinal warp direction and nylon/polyamide yarns in the transverse weft direction, while NN uses nylon yarns in both warp and weft directions.

EP construction provides lower longitudinal elongation and better dimensional stability, while NN construction offers higher elasticity, flexibility and impact absorption. Different belt strengths, ply constructions, cover thicknesses and rubber compounds can be selected according to the conveyor system, conveyed material and operating conditions.

EP & NN Carcass Options

2–6 Ply Construction

200–3780 N/mm Belt Strength

300–3500 mm Belt Width

Multiple Cover Compounds

ISO 14890:2026 Compliance

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EP/NN Conveyor Belt Profile

EP Conveyor Belt: EP stands for Polyester-Nylon. Polyester yarns are used in the longitudinal warp direction, while nylon/polyamide yarns are used in the transverse weft direction. The polyester warp helps control longitudinal elongation and maintain dimensional stability under working tension, while the nylon weft provides the transverse flexibility required for troughing and repeated belt flexing. EP conveyor belts are particularly suitable where stable belt length, controlled elongation, reduced take-up requirement and continuous medium- to long-distance conveying are important.

NN Conveyor Belt: NN stands for Nylon-Nylon. Nylon yarns are used in both the longitudinal warp and transverse weft directions. The all-nylon carcass provides high elasticity, excellent flexibility, good troughability and strong impact absorption, making NN conveyor belts particularly suitable for conveyors exposed to repeated bending, dynamic loading and impact-intensive material handling. Because nylon has higher longitudinal elongation than polyester, sufficient take-up travel should be considered when selecting or replacing an NN conveyor belt.

EP Conveyor Belt Features

◆ EP & NN Carcass Options : EP/NN conveyor belts are available with either polyester-warp/nylon-weft EP carcass or nylon-warp/nylon-weft NN carcass, with available constructions ranging from EP100 to EP630 and NN100 to NN500 in 2–6 ply configurations. EP construction emphasizes lower longitudinal elongation and dimensional stability, while NN construction provides higher elasticity and flexibility for impact-intensive conveying.
◆ High Tensile Strength & Load Capacity :Multi-ply EP and NN carcasses can be matched to different conveyor tensions and material loads, with available finished-belt tensile strengths ranging from 200 N/mm to 3780 N/mm, depending on fabric grade and number of plies. Full-thickness tensile strength and elongation are verified according to ISO 283:2023.
◆ Controlled Elongation or High Elasticity : EP polyester warp reinforcement helps maintain stable belt length, with conventional polyester fabric belts showing around 0.5–1.0% permanent elongation as an industry reference, while the all-nylon NN carcass provides greater elasticity and repeated-bending capability. This allows the carcass type to be selected according to take-up capacity, conveyor length and operating conditions.
◆ Good Flexibility, Troughability & Pulley Adaptability : Both carcass systems provide the transverse flexibility required for troughed conveying, while NN offers particularly high flexibility for repeated bending and smaller-pulley applications. Finished-belt troughability is verified according to ISO 703:2025, and minimum pulley diameter can be determined according to ISO 3684 based on belt construction and operating tension.
◆ Impact Resistance & Carcass Durability : Nylon reinforcement helps absorb dynamic deformation at loading and transfer points, with NN construction particularly suited to ore, stone, coal and other lump-material applications exposed to repeated impact. Tear propagation resistance of textile conveyor belts can be evaluated according to ISO 505:2025, while EP construction provides a balance of longitudinal stability and transverse impact resistance.
◆ Reliable Interply & Cover Adhesion : Skim rubber bonds the textile plies and outer covers into an integrated carcass, helping resist delamination during repeated flexing, tensioning and impact loading. Ply-to-ply and cover-to-carcass adhesion are verified according to ISO 252:2023, providing measurable control of carcass bonding performance.
◆ Multiple Cover Compound & Thickness Options :
EP/NN conveyor belts can be supplied with abrasion-resistant, heat-resistant, oil-resistant and flame-resistant rubber covers, with available constructions supporting top covers up to 30 mm and bottom covers up to 20 mm depending on belt specification. Heat-resistant cover performance can be verified according to ISO 4195:2026, while other compounds are selected according to the conveyed material and operating environment.

EP/NN Conveyor Belt Technical Standards

① TRANSCO EP/NN conveyor belts are manufactured and verified in accordance with ISO 14890:2026, covering the principal requirements for rubber-covered conveyor belts of textile construction. Products also comply with GB/T 7984-2013 and GB/T 32457-2015 for Chinese-standard applications.
② Full-thickness tensile strength and elongation are verified according to ISO 283:2023, while ply-to-ply and cover-to-carcass adhesion are tested according to ISO 252:2023, providing measurable verification of carcass strength and bonding performance.
③ Transverse flexibility and troughability are evaluated according to ISO 703:2025, while tear propagation resistance is verified according to ISO 505:2025. Minimum pulley diameter can be determined according to ISO 3684 based on belt construction and operating tension.
④ Rubber cover performance is verified through standardized physical-property testing, including tensile strength and elongation according to ISO 37:2024 and abrasion resistance according to ISO 4649:2024. Cover grades are classified in accordance with GB/T 33525-2025.
⑤ Special-performance EP/NN conveyor belts are manufactured and tested according to the corresponding standards, including ISO 4195:2026 for heat-resistant covers, ISO 1817:2026 for oil and liquid resistance, and ISO 188:2023 for accelerated ageing and heat resistance.
⑥ Where additional safety performance is required, flame resistance is verified according to ISO 340:2022 and GB/T 10822-2014, while electrical conductivity and antistatic performance are verified according to ISO 284:2025 and GB/T 3684-2021.

EP Conveyor Belt Specification

Carcass	Carcass Structure		Carcass	Carcass Thickness	Strength（N/mm）					Cover Thickness		Width
	Carcass Structure		Carcass	Carcass Thickness	Strength（N/mm）					（mm)		（mm）
	Warp	Weft	Type	（mm/p)	2ply	3ply	4ply	5ply	6ply	top	bottom
	Warp	Weft	Type	（mm/p)	2ply	3ply	4ply	5ply	6ply	cover	cover
EP	Polyester	Nylon	EP100	1	200	300	400	500	600	1.5-30	1.5-20	300-3500
			EP125	1	250	375	500	625	750
			EP150	1.1	300	450	600	750	900
			EP200	1.2	400	600	800	1000	1200
			EP250	1.4	500	750	1000	1250	1500
			EP300	1.6	600	900	1200	1500	1800	2-30	2-20
			EP350	1.7	700	1050	1400	1750	2100
			EP400	1.9	800	1200	1600	2000	2400
			EP500	2.5	1000	1500	2000	2500	3000
			EP630	3.8	1260	1890	2520	3150	3780

NN Conveyor Belt Specification

Carcass	Carcass Structure		Carcas s Type	Carcass Thickness （mm/p)	Strength （ N/mm ）					Cover Thickness （mm)		Width （mm）
Carcass	Warp	Weft	Carcas s Type	Carcass Thickness （mm/p)	2ply	3ply	4ply	5ply	6ply	top cover	bottom cover	Width （mm）
NN	Nylon	Nylon	NN100	0.75	200	300	400	500	600	1.5-30	1.5-20	300-3500
			NN125	0.80	250	375	500	625	750
			NN150	0.90	300	450	600	750	900
			NN200	0.95	400	600	800	1000	1200
			NN250	1.25	500	750	1000	1250	1500
			NN300	1.30	600	900	1200	1500	1800	2-30	2-20
			NN350	1.60	700	1050	1400	1750	2100
			NN400	1.80	800	1200	1600	2000	2400
			NN450	2.00	1000	1500	2000	2500	3000
			NN500	2.20	1260	1890	2520	3150	3780

Adhesion Strength and Elongation

Carcass Type (EP/NN）	Adhesion			Elongation
	Between Plies N/MM	Between Rubber and Carcass N/MM		Full thickness longitudinal reference force elongation (%≤)
		Cover Thickness （0.8-1.5mm)	Cover Thickness >1.5mm
Mean Value	≥ 4.5	≥3.2	≥3.5	4
Lowest Data	≥3.9	≥2.4	≥2.9

EP/NN Conveyor Belt Construction

Top Rubber Cover : Protects the belt carcass from abrasion, impact, cutting, weather and direct contact with conveyed materials. Cover thickness and rubber compound are selected according to the material and operating environment.

EP or NN Fabric Carcass : The textile carcass is the primary load-bearing reinforcement.
EP Fabric : Polyester warp + Nylon weft, providing low longitudinal elongation, dimensional stability and transverse flexibility.
NN Fabric : Nylon warp + Nylon weft, providing high elasticity, excellent flexibility, troughability and impact absorption.

Skim Rubber : Located between adjacent fabric plies, skim rubber bonds the reinforcement layers together and transfers stresses throughout the carcass during tensioning, flexing, impact and troughing.

Bottom Rubber Cover : Protects the pulley and return side of the carcass from idler contact, pulley friction and mechanical wear during continuous operation.

Rubber Moulded Edge : Where moulded-edge construction is specified, rubber surrounds and protects the textile carcass at the belt edge, helping reduce direct exposure of the reinforcement.

EP vs NN Conveyor Belt

EP and NN conveyor belts are both multi-ply textile conveyor belts, but they use different carcass materials. EP uses polyester in the warp and nylon in the weft, while NN uses nylon in both directions. The main selection differences are elongation, dimensional stability and flexibility.

Property	EP Conveyor Belt	NN Conveyor Belt
Carcass	Polyester Warp + Nylon Weft	Nylon Warp + Nylon Weft
Longitudinal Elongation	Lower	Higher
Dimensional Stability	Higher	Lower than EP
Elasticity	Moderate	Higher
Flexibility	Good	Excellent
Impact Absorption	Good	Strong
Troughability	Good	Excellent
Take-Up Requirement	Generally Lower	Generally Higher
Typical Selection Priority	Stable running and controlled elongation	Flexibility and impact-intensive conveying

Choose EP When	Choose NN When
Choose an EP conveyor belt when lower longitudinal elongation, dimensional stability and reduced take-up travel are important. EP is commonly selected for continuous conveying systems requiring stable belt length and controlled operating tension.	Choose an NN conveyor belt when carcass flexibility, impact absorption and repeated bending performance are more important, particularly for conveyors handling lump materials or operating under demanding loading conditions.

EP Conveyor Belt Applications


Mining & Ore Handling	Cement & Limestone	Quarry & Aggregate
Used for transporting coal, ore and processed minerals between crushing, screening, processing and stockpiling areas. EP is well suited to longer continuous conveyors where controlled elongation is important. NN is particularly useful at impact-intensive loading and transfer points.	Used for limestone, crushed raw materials and other bulk materials throughout cement production. Belt strength, cover thickness and cover compound should be selected according to material size, abrasion and temperature. Heat-resistant constructions should be specified separately where required.	Suitable for crushed stone, gravel, sand and aggregate handling between crushers, screens and stockpiles. NN construction is advantageous where coarse or lump materials create repeated impact, while EP provides stable continuous conveying where controlled belt stretch is preferred.

Ports & Bulk Terminals	Power Plants	Agriculture & Fertilizer
Suitable for handling coal, ore, aggregates, fertilizers and other bulk commodities in stockyard, transfer, loading and unloading systems. EP construction is commonly selected where stable operation over longer conveying distances is important, while NN can be used where repeated flexing and dynamic loading are more demanding.	Used in coal yards, transfer conveyors, feeding systems and power-plant conveyor lines. Flame-resistant or antistatic cover compounds can be specified where required by the operating environment.	EP/NN fabric conveyor belts can also be selected for grain, fertilizer and other agricultural bulk materials in storage, processing and loading systems according to the required belt construction and rubber compound.

Rubber Conveyor Belt Shipping And Packing

TRANSCO provides flexible packing and shipping solutions according to the belt type, width, thickness, roll length, total weight and transportation method, helping protect conveyor belts during storage, handling and international shipment.

Packaging Forms
Conveyor belts can be packed in different roll configurations to suit belt dimensions and container loading requirements: ◊Round Roll ◊Double Roll ◊Oval Roll ◊Protective Wrapping	Each belt roll can be securely wrapped to protect the belt during handling and transportation: ◊Waterproof PP woven cloth wrapping ◊Protective plastic film ◊Edge protection ◊High-strength strapping ◊Custom wrapping colors and markings ◊Reel & Support Options	Different support structures can be selected according to belt size, roll weight and unloading conditions: ◊Steel Reel / Steel Core ◊Wooden Drum / Wooden Core ◊Wooden Pallet ◊Steel Pallet ◊Reinforced Steel Frame
Secure Container Loading	Customized Packing	Packing Recommendation
Heavy or large conveyor belt rolls can be securely positioned and reinforced inside the container to reduce unwanted movement during transportation. Roll dimensions, gross weight and packing information can be clearly marked to support safe lifting and unloading.	Packing methods can be customized for sea freight, container transport and project deliveries. Special steel-reel or reinforced-frame packing is available for large, heavy or long-length conveyor belt rolls.	Our team recommends the appropriate roll form, wrapping material, reel structure and loading method according to each conveyor belt specification and destination, balancing product protection, handling efficiency and shipping space.

Frequently Asked Questions

Q What is the difference between an EP and NN conveyor belt?

The main difference is the carcass material. An EP conveyor belt uses polyester yarns in the warp direction and nylon/polyamide yarns in the weft direction, while an NN conveyor belt uses nylon yarns in both warp and weft directions.
EP generally provides lower longitudinal elongation, better dimensional stability and lower take-up requirements, while NN provides higher elasticity, greater flexibility and stronger impact absorption.

Q How do I choose between an EP and NN conveyor belt?

Choose EP when stable belt length, controlled elongation and reduced take-up travel are important, particularly for continuous medium- or long-distance conveying.
Choose NN when greater carcass flexibility, repeated bending performance and impact absorption are more important, particularly around loading points, crushers and conveyors handling lump materials.
Final selection should consider the conveyor length, operating tension, material load, impact conditions, pulley diameter, trough angle and available take-up travel.

Q How do I choose the correct belt strength and number of plies?

The belt should not be selected by ply number alone. The required construction depends on operating tension, conveyor length, belt width, lift height, conveying capacity and material load.
Our available EP/NN multi-ply constructions cover 2–6 plies with finished-belt tensile strengths from 200 N/mm up to 3780 N/mm, depending on the selected fabric grade and carcass construction. Full-thickness tensile strength and elongation are verified according to ISO 283:2023.

Q Can an EP conveyor belt be replaced directly with an NN belt, or vice versa?

Not always. Even when the belt width and nominal tensile strength are the same, EP and NN carcasses have different elongation, elasticity, bending and take-up characteristics.
When changing from EP to NN or from NN to EP, the available take-up travel, operating tension, pulley diameters, troughability, belt construction and splice arrangement should be checked before confirming the replacement.

Q Does an NN conveyor belt require more take-up travel than an EP belt?

Generally, yes. Nylon reinforcement has higher longitudinal elasticity and elongation than the polyester warp used in EP construction, so an NN belt normally requires more take-up allowance.
The actual take-up requirement depends on the belt strength, number of plies, conveyor center distance, working tension and take-up system, and should be confirmed as part of the conveyor design or replacement process.

Q Which carcass is better for impact loading and lump materials?

NN is generally preferred where repeated impact, dynamic loading and carcass flexibility are major requirements because its all-nylon reinforcement provides greater elasticity and impact absorption.
EP belts can also be used for heavy-duty applications when the correct belt strength, ply construction and cover thickness are selected. The final choice should consider material lump size, drop height, loading frequency and transfer-point conditions rather than carcass type alone.

Q How do I know whether an EP/NN conveyor belt will trough correctly or fit the existing pulleys?

Troughability and bending performance depend on the belt width, carcass strength, number of plies, total belt thickness and cover thickness.
Finished-belt transverse flexibility can be verified according to ISO 703:2025, while minimum pulley diameter should be determined according to the selected belt construction and ISO 3684 requirements. A higher-strength or thicker belt should not automatically be installed on the same pulleys without checking compatibility.

Q Which rubber cover should I choose for an EP/NN conveyor belt?

The cover compound should be selected according to the conveyed material and operating environment, independently from whether the carcass is EP or NN.
Abrasion-resistant covers are commonly selected for ore, stone and aggregates, while heat-resistant, oil-resistant and flame-resistant compounds are available for the corresponding service conditions. Cover thickness should also be matched to material abrasion, impact severity and expected service conditions.

Q How is the bonding between the fabric plies and rubber verified?

Skim rubber bonds adjacent EP or NN fabric plies and connects the textile carcass to the outer rubber covers. Reliable adhesion helps maintain carcass integrity during repeated flexing, tensioning and impact loading.
Ply-to-ply and cover-to-carcass adhesion are verified according to ISO 252:2023, providing measurable control of the bonding performance within the multi-ply belt construction.

Q What information should I provide when ordering an EP/NN conveyor belt?

For accurate selection, provide the existing belt designation or required carcass type, belt width, tensile strength, number of plies, top and bottom cover thickness, conveyor length, lift height, belt speed, conveying capacity, material type, bulk density, maximum lump size, loading height, pulley diameters, trough angle, operating temperature and required cover compound.
If the existing EP or NN specification is unknown, photos of the belt marking and cross-section together with the conveyor operating data can help confirm a suitable replacement construction.