遮阳棚的面料选择，大多数人只看颜色和厚度。但决定它“能用几年”的，是涂层工艺和基布材质。

Most people only consider color and thickness when choosing the fabric for a sunshade. But what determines how many years it can last is the coating process and the base fabric material.

PVC涂层布是“入门款”。 价格便宜、防水性能强，但抗腐蚀性差、容易褪色、防紫外线能力一般，使用寿命通常只有1-2年。适合临时活动或预算出彩低的场景，长期户外使用不划算。

PVC coated fabric is an "entry-level" product. The price is cheap, the waterproof performance is strong, but the corrosion resistance is poor, it is easy to fade, the UV resistance is average, and the service life is usually only 1-2 years. Suitable for temporary activities or extremely low budget scenarios, long-term outdoor use is not cost-effective.

牛津布带胶质层是“中间档”。 防水性能好，遮阳效果不错，但材质比较脆、易褪色，一般使用2-3年。它的性价比体现在“短期够用”，不适合追求长期稳定性的场景。

The Oxford ribbon adhesive layer is the 'middle tier'. Good waterproof performance and good sun shading effect, but the material is relatively brittle and easy to fade, usually used for 2-3 years. Its cost-effectiveness is reflected in its ability to meet short-term needs and is not suitable for scenarios that pursue long-term stability.

国产涤纶布是“实用档”。 防晒效果好，可阻挡90%的紫外线，色牢度达到5级以上标准，可使用3-5年不褪色。对于大多数家庭露台和商铺遮阳需求，这个档位是性价比非常高的选择。

Domestic polyester fabric is a 'practical grade'. Good sun protection effect, can block 90% of ultraviolet rays, with color fastness reaching level 5 or above, and can be used for 3-5 years without fading. For most home terraces and commercial shading needs, this gear is the most cost-effective choice.

进口锦纶布是“长期主义”。 防紫外线能力强、韧性好、防水性能强，色牢度达8级，保质6-8年不褪色。价格非常高，但换布频率非常低，按“年均成本”算反而可能比PVC更划算。

Imported nylon fabric is a form of 'long termism'. Strong UV resistance, good toughness, strong waterproof performance, color fastness up to level 8, and a shelf life of 6-8 years without fading. The highest price, but the lowest frequency of fabric replacement, may actually be more cost-effective than PVC based on the "average annual cost".

涂层是“防晒”的核心，不是颜色深浅。 一块浅色但涂层到位的遮阳布，紫外线阻隔率可能远高于深色但涂层偷工减料的产品。选购时问清楚“UPF值多少”，比看颜色深浅靠谱得多。

The coating is the core of "sunscreen", not the depth of color. A light colored but well coated sunshade cloth may have a much higher UV blocking rate than a dark colored but poorly coated product. When making a purchase, asking for the UPF value is much more reliable than looking at the color depth.