While there is some overlap between perforated pipes and filter cylinders, they have different primary focuses.

Perforated pipes emphasize their tubular structure, fluid flow, support, protection, and perforation design. Filter cylinders, by contrast, focus on filtration precision, end caps, connection interfaces, sealing, and their specific function within a filtration system. A perforated pipe can serve as the core body of a filter cylinder, or it can function independently as a ventilation pipe, support pipe, protective sleeve, or silencer pipe.

No, aluminum does not rust. Rust is a corrosion product associated with iron and iron-rich alloys (such as steel). When exposed to oxygen, it forms a thin, tightly adhering film of aluminum oxide, which slows further corrosion rather than peeling off and exposing new metal. This oxide film is a key reason why aluminum is widely considered a naturally corrosion-resistant metal. It protects the aluminum inside from further corrosion, hence the common saying "aluminum doesn't rust."

The rust formed when iron rusts is loose and porous, and it will continue to corrode inwards; the oxide film of aluminum is dense, and its properties are different.

However, under conditions such as strong acid, strong alkali, seawater/chloride ion environment, mercury salt, etc., the oxide film of aluminum will be destroyed, and aluminum will also be corroded, resulting in phenomena such as whitening, powdering, and pitting, sometimes called "white rust" or aluminum corrosion.

Aluminum does not rust like iron, but it can oxidize and corrode under certain conditions.

The information you inquired about regarding the MTC/inspection record details is typically not a default field in the standard MTC. The core of the MTC is the measured results of chemical composition and mechanical properties, and it may include supplementary items such as flattening/bending tests and water pressure/eddy current tests. The MTC of ASTM A53 also focuses on cross-checking product type, grade, size, wall thickness, furnace number, and order. These fall under the category of "Dimensional and Process Records in the Manufacturing Process," and the buyer needs to explicitly request the supplier to include them in the accompanying inspection records in the purchase order (PO) or inspection and testing plan (ITP), rather than relying solely on the MTC itself.

1. Pipe end type: The end type (such as PE/BE/TBE/groove) will be indicated on the MTC or packing list. If you need more specific confirmation, you can add an end type check item to the dimensional inspection record.

2. Bevel angle/blunt edge: According to ASTM A53, the manufacturing requirements are a bevel angle of 30° (+5/-0) and a blunt edge of 1.6mm ± 0.8mm. The measured values will be recorded in the factory dimensional inspection record. The sampling frequency can be agreed upon according to your requirements (e.g., pieces per batch) and will be provided with the MTC.

3. Zinc Supplementation Treatment: Zinc supplementation repair records are provided in the form of independent inspection records, including the repair area, zinc content of the repair material, measured dry film thickness, and adhesion test results, ensuring process traceability. If you require this record to be included in the accompanying documents, you can make a clear request in the PO.