The lightweight design of sealing modules for diving equipment achieves weight reduction through material innovation, structural optimization, and integrated processes while ensuring watertightness, pressure resistance, and reliability. This improves the diver’s mobility, comfort, and endurance. Especially in the fields of technical diving, military frogmen, and underwater robots, every 10-gram reduction has tactical or physiological significance.

The following are the four core approaches and engineering practices for achieving lightweight design in TST SEAL diving equipment sealing modules :

1. 1. High-performance lightweight material alternatives

✅ (1) Sealing materials: from traditional rubber to advanced elastomers

📌 Key: Use microporous foamed silicone in non-pressure areas (such as buttons and battery covers) to significantly reduce weight without sacrificing sealing performance.

✅ (2) Structural frame: metal → high-performance engineering plastics/composite materials

⚠️ Note: Plastics must pass the creep resistance test (do not deform under long-term water pressure) and avoid direct contact with metals (galvanic corrosion).

II.2. Structural Topology Optimization and Thin-Wall Design

✅ (1) Finite Element Analysis (FEA)

Perform hydrostatic pressure simulation on the sealing frame (e.g., 1 MPa @ 100m);

Identify low-stress areas and thin or hollow them out locally (such as honeycomb structures).

Example: The thickness of a diving computer battery cover was reduced from 3.0mm to 1.8mm after topology optimization, resulting in a 35% weight reduction, while still passing the EN 250 impact test.

✅ (2) One-piece molding (reducing the number of connecting parts)

Traditional: Metal frame + rubber ring + screws (multiple parts, heavy);

Lightweight: LSR liquid silicone is directly injection molded onto the plastic housing (no O-ring grooves, reducing weight by 20%+);

Advantages: Eliminates assembly tolerances and improves sealing consistency.

✅ (3) Ultra-thin sealing lip design

Using high elastic modulus silicone (hardness 70A), the sealing lip thickness can be reduced to 0.8–1.2 mm (compared to the traditional 1.5–2.0 mm).

With precision CNC grooves (Ra ≤0.2μm), a seal can be achieved with low-pressure pre-tightening.

1. 3. Functional Integration: One Product, Multiple Uses

💡 Case Study: The Shearwater Teric diving computer features sapphire glass, a titanium alloy frame, and a one-piece silicone seal, weighing only 79g and supporting a depth of 100m.

1. 4. 4. Manufacturing Process Innovation

✅ (1) Microcellular injection molding (MuCell®)

N₂/CO₂ is injected into TPU/PEEK to form micron-sized bubbles;

Density is reduced by 10–15%, while dimensional stability is improved;

It has been used in the housing of some regulators for Scubapro.

✅ (2) 3D printing customized lightweight structure

Non-standard sealing brackets are printed using continuous carbon fiber reinforced nylon (such as Markforged);

Topology optimization and lattice filling reduce weight by more than 50%;

Suitable for small-batch military/scientific research equipment.

1. 1. The principle of balancing lightweight design and reliability

🔑 Golden Rule:
“Shallow waters are for lightness, deep waters for stability; when lives are at stake, redundancy is paramount.”

1. 1. Comparison of Typical Lightweight Products

Lightweighting of sealing modules for diving equipment = Material innovation × Simplified structure × Functional integration × Upgraded processes, but must adhere to the following principles:

✅ Safety bottom line: Lightweighting must not come at the expense of watertight redundancy, impact resistance, or biosafety;
✅ Scenario adaptability: Shallow-water consumer products can boldly reduce weight, while deep-water/military equipment must prioritize reliability.

Future direction:

Smart materials (such as shape memory polymer adaptive seals);

Biomimetic structure (shark skin microgroove drag reduction + sealing).