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8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong Featured Image
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong
  • 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong

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We have the most advanced production equipment, experienced and qualified engineers and workers, recognized quality control systems and a friendly professional sales team pre/after-sales support for 21"Edge Folded Ring Surround Repair Kit , 3"Rubber Surround , 8"Horn Surround Repair Kit , As an experienced group we also accept custom-made orders. The main intention of our firm is to build up a satisfying memory for all consumers, and set up a long-term win-win small business connection.
8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong Detail:

Excellent oil resistance, good wear resistance, good heat resistance,strong adhesion

Application Car audio, Home audio, Subwoofer audio, Stage speakers, Wall speakers, Ceiling speakers, Outdoor speakers, Intelligent voice Bluetooth speakers, surround sound, artificial intelligence speakers, Self DIY audio design.
Material NBR with another more than 10 types of additives to adjust the performance of the rubber
Hardness 40~85°
Thickness 0.10mm-15mm,accept customized
Surface treatment Black light, Sanding, Biting lace, etc
Shape Round, Oval, Rectangle,Accept foreign molds ,Support customize molds
Edge design High pressure strip, Textured, Anti concave edge, Notching, Punching, etc
Color As requested by clients
Feature Anti-aging, Waterproof, Durable, Pliable
Certification ISO9001,IATF16949,ISO14001
Capacity 80000pcs/month

A surround’s quality has enormous impact on the frequency response of a loudspeaker. The shore hardness directly affects the frequency of the speaker. Rubber surrounds also endure a long lifetime, almost 20~30years.

A surround is part of the sub’s suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.

Nitrile -butadiene rubber (also known as NBR rubber) was developed during the 1930s. It is fabricated through the co-polymerization of acrylonitrile (ACN) (polar building block) and 1.3-butadine (nonpolar building block). It is the seal industry’s most widely used and economical elastomer. This is partly because it displays excellent resistance to petroleum-based oils, fuels, water, alcohols, silicone greases and hydraulic fluids. Nitrile has a temperature range of between -54 and +149 degrees Celsius and has a good balance of desirable properties like low compression set, high abrasion resistance and high tensile strength. 

  • Guangdong Nandi Yanlong Technology Co., Ltd.
  • Low temperature tensile test of rubber materials NBR
Lab Date： 2022.05.11-05.13 Lab Model：ND158-399
No. Model Lab Conditions Time Lab Temp Test result Test Diff
5 NBR65-2 1 Vulcanization conditions: 12H 23℃ Peak value Disp Str FO Peak value Disp Str FO
Suface Temp Mold Temp Time Pressure Cap 12H -40℃ 33.92 36.53 2.25 35 -0.05 +2.30 -0.01 +1
190/195℃ 170/175℃ 45S 8kg/C㎡ 65T 24H -40℃ 40.42 43.17 2.69 36 +6.50 +9.25 +0.44 +1
2 100 ° 2-hour twice vulcanization. 36H -40℃ 41.22 45.22 2.74 36 +0.80 +2.05 +0.05 0
3 Tension machine speed: A is 10 and B is 100 48H -40℃ 41.5 44.32 2.76 36 +0.28 -0.90 +0.02 0
4 Tension plate:45mm*10mm*0.5mm 96H -40℃ 36.8 40.07 2.45 36 -4.25 -4.25 -0.31 0
5 Lab temp: 25℃±2℃, humidity 65%±30% Avg 38.772 41.862 2.76 35.8 0.19 0.08 0.03 0.4
Tabulator：Liu Li Auditor： Aken Inspector：Vic Chiu
一、Note：
1.peak value:the biggest tension.
2.Strength：In the tensile test, the maximum tensile stress of the specimen until it breaks.
3.Displacement：Travel distance from static movement to fracture.

Payment method: Pay 30% for deposit,70% before shippment.

Accept US dollars, RMB, if other currencies, please consult before paying.

Term:EXW/FOB/CIF/CFR/DDP

Port: Shen Zhen/Guang Zhou/Ning Bo/Shang Hai

Production Lead Time: 1-1k, 2 days；1k-10k, 7days；above 10k，negotiated.

Package:Export Standard Unified Carton Packaging.

Small quantity is usually shipped by courier.

Bulk quantity ship by air , by sea,by railway

Special service: help find low freight and freight counter-offer

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To create extra value for customers is our enterprise philosophy; buyer growing is our working chase for Wholesale Rubber surrounds, Rubber products, Cone paper used on all kinds of speakers. President of our company, with whole staff, welcomes all buyers to visit our company and inspect. Let us cooperate hand in hand to make a good future.

Our growth depends on the superior equipment, exceptional talents and continuously strengthened technology forces for Wholesale products which will supply to all over the world. Upon today, we have customers from all over the world. The mission of our company is to provide the highest quality products with best price. We are looking forward to doing business with you!

Product detail pictures:

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong detail pictures

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In the past few years, our business absorbed and digested advanced technologies both equally at home and abroad. In the meantime, our company staffs a group of experts devoted to your advancement of 8 Year Exporter 20Edge Folded Ring - NBR Rubber surround used on loudspeaker – Nandi Yanlong , The product will supply to all over the world, such as: Guatemala, Puerto Rico, Yemen, Our market share of our products has greatly increased yearly. If you are interested in any of our products or would like to discuss a custom order, please feel free to contact us. We are looking forward to forming successful business relationships with new clients around the world in the near future. We are looking forward to your inquiry and order.
    • Factory equipment is advanced in the industry and the product is fine workmanship, moreover the price is very cheap, value for money!
    5 Stars By Elma from Switzerland - 2018.08.12 12:27
    The customer service staff is very patient and has a positive and progressive attitude to our interest, so that we can have a comprehensive understanding of the product and finally we reached an agreement, thanks!
    5 Stars By Delia Pesina from Mauritius - 2018.11.28 16:25
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