Professional Design 2Edge Folded Ring Surround Repair Kit - NBR Rubber surround used on loudspeaker – Nandi Yanlong

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We now have our own gross sales team, style and design workforce, technical crew, QC workforce and package group. We now have strict quality manage procedures for each system. Also, all of our workers are experienced in printing industry for Metal Cone , 9"Foam Surround Replacement , 15 Inch Speaker Cone , Teamwork is encouraged at all levels with regular campaigns. Our research team experiments on various developments in the industry for improvement in the products.

Professional Design 2Edge Folded Ring Surround Repair Kit - 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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Our well-equipped facilities and superb good quality control throughout all stages of manufacturing enables us to guarantee total buyer gratification for Professional Design 2Edge Folded Ring Surround Repair Kit - NBR Rubber surround used on loudspeaker – Nandi Yanlong , The product will supply to all over the world, such as: Georgia, Hungary, Pretoria, With strong technical strength and advanced production equipment, and SMS people purposefully , professional, dedicated spirit of enterprise. Enterprises took the lead through the ISO 9001:2008 international quality management system certification, CE certification EU ; CCC.SGS.CQC other related product certification. We look forward to reactivating our company connection.

1"Edge Folded Ring Surround Repair Kit