Manufacturing Companies for 21Edge Folded Ring - SBR Rubber surround used on loudspeaker-1inch-21inch – Nandi Yanlong

Excellent wear resistance, excllent heat aging resistance, good impact resistance.

SBR stands for styrene-butadiene rubber, is a synthetic rubber commonly produced worldwide. Styrene-butadiene or styrene-butadiene rubber (SBR) describe families of synthetic rubbers derived from styrene and butadiene.

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.

Styrene-butadiene rubber offers a range of advantages. It is resistant to water and glycol and very hardwearing. SBR offers good abrasion resistance, outstanding impact strength, good resilience and high tensile strength. SBR is the best synthetic elastomer to use in dynamic and abrasive conditions. The main applications of SBR include automotive parts and mechanical rubber goods. It also has heat aging resistance and delivers good compression set and water resistance. It is often used as a direct replacement for natural rubber, due to its similar characteristics but more economical price tag.

It is the addition of the organic compound styrene that contributes towards SBR’s advantageous strength, abrasion, wear and bonding properties, not to mention its affordability. Styrene-butadiene rubber generally offers superior heat-ageing properties and abrasion resistance than natural rubber. It is widely used in the production of tire tape, hose, wires, cables, medical instruments and various rubber products. It is the largest generic synthetic rubber variety and one of the earliest rubber varieties to achieve industrial production.

• Guangdong Nandi Yanlong Technology Co., Ltd.
  Low temperature tensile test of rubber materials SBR
  Lab Date： 2022.05.11-05.13														Lab Model：ND158-399
  No.	Model		Lab Conditions					Time	Lab Temp	Test result				Test Diff
  2	SBR60	1	Vulcanization conditions:					12H	23℃	Peak value	Disp	Str	FO	Peak value	Disp	Str	FO
  			Suface Temp	Mold Temp	Time	Pressure	Cap	12H	-40℃	30.75	39.74	2.05	32	-0.97	-1.42	-0.06	+2
  			190/195℃	170/175℃	45S	8kg/C㎡	65T	24H	-40℃	34.72	45.7	2.31	31	+4.03	+5.96	+0.26	-1
  		2	100 ° 2-hour twice vulcanization.					36H	-40℃	35.72	45.83	2.38	32	+1.00	+0.13	+0.07	+1
  		3	Tension machine speed: A is 10 and B is 100					48H	-40℃	35.42	47.25	2.36	32	-0.30	+1.42	-0.02	0
  		4	Tension plate:45mm*10mm*0.5mm					96H	-40℃	32.62	41.56	2.17	32	-2.80	-5.69	-0.19	0
  		5	Lab temp: 25℃±2℃, humidity 65%±30%					Avg		33.846	44.016	2.38	31.8	0.19	0.08	0.03	0.4
  Tabulator：Liu Li								Auditor： Zhiming Guo						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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