行业内船用橡胶气囊和充气橡胶护舷价格相差很大原因分析

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近年来，市场上出现了一批价格极低的船用橡胶气囊和充气橡胶护舷产品。这类产品虽然在价格上具有一定吸引力，但在质量与性能方面存在严重隐患。以下是导致其价格过低的几个主要原因：

    原因一：使用再生胶替代天然橡胶，性能严重缩水

    天然橡胶的市场价格每吨通常比再生胶高出一万元以上。低价气囊和护舷大多使用部分甚至全部再生胶替代天然橡胶，虽然大幅降低了成本，却极大影响了橡胶的物理性能。按照ISO14409-2014国际标准和GB/T33487-2017国家标准，外层橡胶的拉伸强度需达到18MPa以上，而使用再生胶的产品通常难以达标，属于不合格产品。

      

    此外，因再生胶耐候性和抗老化能力较差，这类产品表面橡胶通常在3至6个月内就会出现龟裂现象。而青岛永泰的产品，即使在长期暴露于户外环境下，外层橡胶出现裂纹的时间也在3年以上，明显优于市面产品。

    原因二：使用涤纶帘子布替代锦纶帘子布，强度与弹性不足

    为进一步降低成本，不少低价产品还采用涤纶帘子布（PET）代替锦纶帘子布（尼龙，PA）。二者虽然外观相似，但性能差距明显：

粘合力方面：锦纶与橡胶的粘合力可达258N以上，而涤纶仅为160N左右，极易发生线与橡胶分层鼓包现象。

弹性恢复率：锦纶弹性恢复率在98% 左右，而涤纶恢复率较差，通常在70-80%，难以保持结构稳定。

耐曲挠性：锦纶帘线的抗弯折疲劳性能是涤纶的10倍以上，更适合长期承载应力的产品。

材料成本：锦纶帘子布每吨价格比涤纶高出6000元以上。

    因此，用涤纶代替锦纶制造的护舷和气囊，在使用寿命、安全性与性能方面都存在严重缺陷。

         

       原因三：采用拼接工艺代替整体缠绕工艺，结构强度不足

低价产品普遍采用“拼接生产工艺”，即将挂胶帘子布裁剪为矩形和梯形，再分层糊制。这种工艺虽然省工省时、效率较高，但存在诸多问题：

    l  结构强度不均匀，拼接处为应力集中点；

    l  硫化过程必须依赖外层缠水布，否则易开裂，表面粗糙；

    l  外观不规整，使用寿命较短。

    相比之下，青岛永泰坚持采用“整体缠绕工艺”，帘子布一体化缠绕成型，每两层以15~25度斜交方式叠合，结构紧密、强度高，且无需缠水布，外观美观、圆润，产品一致性与可靠性显著提升。

    原因四：偷工减料，减少帘子布层数

    部分低价厂家为降低成本，故意减少骨架材料——帘子布的层数，使得产品的承压能力和耐用性大幅下降，存在严重安全隐患。

    原因五：缺乏资质与检测设备，产品质量无保障

    这些极低价产品多出自无资质小工厂，花钱购买质量体系认证证书、不具备基本的检验设备，生产过程完全依靠经验“凭感觉”操作，无法进行出厂前的系统性能测试。更缺乏相关行业认证和技术标准的支撑。

    总结：低价背后的代价，可能是不可挽回的损失

    所谓“一锤子买卖”，低价产品往往是“没有最低，只有更低”。表面上看似价格诱人，实则暗藏诸多质量陷阱。一旦出现问题，这类厂商往往推诿扯皮、甚至直接失联，售后无从保障。

    购买船用橡胶气囊和护舷，务必选择有品牌、有资质、有检测能力的专业厂家，才能真正保障使用安全与经济效益。

Introduction

In recent years, a number of extremely low-priced marine airbags and pneumatic rubber fenders have emerged on the market. While these products may seem attractive due to their price, they pose significant risks in terms of quality and performance. Below are the main reasons behind their low pricing:

Reason 1: Use of Recycled Rubber Instead of Natural Rubber

The market price of natural rubber is generally more than 10,000 RMB per ton higher than that of recycled rubber. Many low-cost airbags and fenders use partially or fully recycled rubber to reduce costs, which significantly compromises the physical properties of the rubber.

According to ISO14409-2014 and GB/T33487-2017 standards, the tensile strength of the outer rubber layer must exceed 18 MPa. Products using recycled rubber often fail to meet this requirement and are therefore considered substandard.

Moreover, due to the poor weather and aging resistance of recycled rubber, surface cracks often appear within 3 to 6 months. In contrast, Evergreen Maritime products show no surface cracks for over 3 years even under long-term outdoor exposure, significantly outperforming generic market products.

Reason 2: Use of Polyester Fabric Instead of Nylon Fabric

To further cut costs, many low-price products use polyester fabric (PET) instead of nylon fabric (PA). Though similar in appearance, their performance differs greatly:

Adhesion Strength: Nylon adheres to rubber with a bond strength of over 258N, while polyester only reaches around 160N, making delamination and bulging more likely.
Elastic Recovery Rate: Nylon has a recovery rate of approximately 98%, whereas polyester typically ranges from 70–80%, making it less structurally stable.

Flex Fatigue Resistance: Nylon offers over 10 times the bending fatigue resistance of polyester, making it more suitable for stress-bearing applications.
Material Cost: Nylon fabric costs more than 6,000 RMB per ton higher than polyester.

Thus, using polyester instead of nylon results in serious flaws in lifespan, safety, and performance.

Reason 3: Use of Patching Process Instead of Integrated Wrapping

Low-cost products often adopt the ‘patching process,’ where rubberized fabric is cut into rectangular and trapezoidal shapes and layered manually. While labor- and time-saving, this method presents several issues:

– Uneven structural strength, with stress concentrated at patch joints.
– Vulcanization requires wrapping with water cloth to prevent cracking, resulting in a rough surface.
– Irregular appearance and shorter service life.

In contrast, Qingdao  Evergreen Maritime insists on using the ‘integrated wrapping process,’ where fabric is wound in a continuous manner. Each two layers cross at a 15–25 degree angle, forming a dense, high-strength structure. This method requires no water cloth wrapping and yields a smooth, attractive appearance with enhanced consistency and reliability.

Reason 4: Skimping on Materials by Reducing Fabric Layers

Some low-cost manufacturers deliberately reduce the number of fabric layers, compromising the product’s pressure resistance and durability, thereby posing serious safety risks.

Reason 5: Lack of Qualification and Testing Equipment

These extremely low-priced products often come from uncertified small factories. They may purchase quality system certificates rather than earn them, and lack even basic inspection equipment. Their production process relies entirely on experience and “gut feeling,” with no capability to conduct systematic performance testing before delivery. Furthermore, these factories often lack support from relevant industry certifications and technical standards.

Conclusion: The Hidden Cost of Low Prices

Low-price products often reflect a ‘one-shot deal’ mentality — there’s no lowest, only lower. What seems attractive in price often conceals quality pitfalls. When issues arise, such manufacturers tend to shirk responsibility or even disappear, leaving no room for after-sales support.

When purchasing marine rubber airbags and fenders, it is essential to choose professional manufacturers with a reputable brand, proper qualifications, and complete testing capabilities to ensure true safety and economic efficiency.