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

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That has a sound business enterprise credit rating, exceptional after-sales provider and modern producing facilities, we now have earned an superb standing amongst our buyers across the world for PP Cone With Rubber Surround , PP Cone With Foam Surround , Subwoofer Rubber Edge Kit , Honesty is our principle, professional operation is our work, service is our goal, and customers' satisfaction is our 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

NBR65-2

Vulcanization conditions:

12H

23℃

Peak value

Disp

Str

Peak value

Disp

Str

Suface Temp

Mold Temp

Time

Pressure

Cap

12H

-40℃

33.92

36.53

2.25

-0.05

+2.30

-0.01

190/195℃

170/175℃

45S

8kg/C㎡

65T

24H

-40℃

40.42

43.17

2.69

+6.50

+9.25

+0.44

100 ° 2-hour twice vulcanization.

36H

-40℃

41.22

45.22

2.74

+0.80

+2.05

+0.05

Tension machine speed: A is 10 and B is 100

48H

-40℃

41.5

44.32

2.76

+0.28

-0.90

+0.02

Tension plate:45mm*10mm*0.5mm

96H

-40℃

36.8

40.07

2.45

-4.25

-0.31

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

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!

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So that you can finest fulfill client's demands, all of our operations are strictly performed in line with our motto "High Excellent, Competitive Price, Fast Service" 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: Turkey, Sweden, Durban, We hope we can establish long-term cooperation with all of the customers, and hope we can improve competitiveness and achieve the win-win situation together with the customers. We sincerely welcome the customers from all over the world to contact us for anything you need!Welcome all customers both at home and abroad to visit our factory. We hope to have win-win business relationships with you, and create a better tomorrow.

14"Edge Folded Ring