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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 always get the job done being a tangible workforce making sure that we can easily give you the very best quality as well as finest selling price for 20"Foam Surround Repair Kit , 6.5"Foam Surround Repair Kit , Rubber Product , We cordially welcome shoppers from in the home and overseas to hitch us and cooperate with us to enjoy a better future.
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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We attempt for excellence, provider the customers", hopes to be the most beneficial cooperation team and dominator enterprise for staff, suppliers and shoppers, realizes value share and continuous advertising for 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: Madrid, America, Congo, "Good quality, Good service " is always our tenet and credo. We take every effort to control the quality, package, labels etc and our QC will check every detail during producing and before shipment. We are willing to establish long business relationship with those who seek the high quality products and good service. We have set up a wide sales network across European countries, North of America, South of America, Middle East, Africa, East Asia countries.Please contact us now, you will find our professional experience and high quality grades will contribute to your business.
    • Good quality, reasonable prices, rich variety and perfect after-sales service, it's nice!
    5 Stars By Linda from Italy - 2017.01.28 18:53
    The factory has advanced equipment, experienced staffs and good management level, so product quality had assurance, this cooperation is very relaxed and happy!
    5 Stars By Jack from Juventus - 2017.06.19 13:51
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