Everyone knows that high-quality silicone rubber sealing rings depend on well-made molds. So what core conditions are required to develop reliable silicone seal molds? Let’s break down the key requirements for mold development.
Key Performance Requirements for Silicone Rubber Seal Molds
1. Wear Resistance
Wear resistance is the core property of mold steel for silicone rubber seals. The hardness of molded silicone parts directly affects mold abrasion loss. Generally speaking, higher hardness of molded products leads to less mold wear and better durability. Besides product hardness, mold wear is also affected by material grade, filler content and product geometry.
2. Strength and Toughness
Mold inserts may suffer sudden brittle fracture during repeated production. For this reason, silicone seal molds must have high tensile strength and good impact toughness to avoid cracking in continuous mass production.
3. Fatigue Fracture Resistance
Silicone molds run continuously under cyclic stress in long-term vulcanization production, which easily causes fatigue cracking. Therefore, mold materials need a balanced combination of strength, toughness and hardness to resist fatigue failure.
4. High-temperature Stability
Silicone rubber molding is carried out under high-temperature vulcanization. High working temperature will reduce the hardness and mechanical strength of mold steel. When developing silicone seal molds, we must select steel with excellent temper resistance to maintain stable performance under sustained high-temperature working conditions.
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27 6 月
How to Select X-Rings | Professional X-Ring Sizing Guide
Choosing the proper X-Ring (star-shaped quad ring) for your sealing application follows these professional selection criteria:
1. Static Seals & Reciprocating Linear Motion
Bore-mounted (housing) seals
The inner diameter of the X-Ring should match the groove dimension, or be roughly 2% smaller than the outer diameter of the groove. The pre-compression creates stable pre-tension and effectively prevents X-Ring twisting during operation.
Shaft-mounted seals
The X-Ring inner diameter needs to equal or slightly exceed the shaft outer diameter by 0.2–0.3 mm, or 1% larger than the shaft OD. This design simplifies installation and extends the service life of the quad ring.
2. Rotary Shaft Sealing
For rotary applications, select an X-Ring whose inner diameter is 2%–5% larger than the shaft diameter.
Rubber X-Rings generate friction heat while rotating, which causes elastomer shrinkage. The enlarged inner diameter maintains proper lubrication and ensures reliable long-term sealing performance.
3. X-Ring Material & Standard Specifications
The most common material is NBR 70 Shore A (N70 nitrile rubber). You can also adopt other elastomer grades that match standard O-Ring material options.
X-Ring dimensions fully conform to universal O-Ring size standards.
27 6 月
NBR O-Ring Advantages & Disadvantages | Silicone Sealing Mold Manufacturing
When manufacturing silicone seal molds and rubber sealing products, NBR O-rings remain the most widely used sealing element. Let’s break down the main advantages and limitations of nitrile rubber O-rings.
Advantages of NBR O-Rings
- NBR O-rings deliver outstanding resistance to water, solvents and mineral oil, plus excellent air tightness for hydraulic and plumbing systems.
- Nitrile rubber features great wear resistance and reliable compression set performance under long-term clamping pressure.
Disadvantages of NBR O-Rings
- NBR seals cannot work well in polar chemical environments. They degrade quickly when exposed to ozone, ketones and other strong polar media.
About Our Precision Mold Factory
Since establishment, Dongguan Ouning Precision has adhered to the principle of premium quality and customer-oriented service, following ISO quality standards to continuously optimize mold precision. Our mold manufacturing has earned consistent recognition from global buyers.
We are equipped with imported CNC machining centers (Taiwan Dali 1020 / 860), KENT grinders, EDM machines, and Miyano (BNA-42C) CNC lathes from Japan. We also adopt Mitutoyo testing instruments and professional design software including UG, PROE, MASTERCAM and CAD. We provide one-stop service from product development to finished rubber seal mold fabrication.
Our core business covers custom molds for 45° X-rings & O-rings, oil shaft seals, valve stem seals, as well as Y-type, U-type, K-type, O-type and X-type high-precision silicone rubber sealing components.