About

At PrecisionElastomerParts.com, Shenzhen SSTC Technology Co,.ltd is belong to OLT GROUP,Precision Elastomer Parts is a professional manufacturer dedicated to high-quality Non-Standard rubber sealing components and molded elastomer parts.
We focus on a full range of rubber materials including Silicone, EPDM, FKM (Viton), NBR and other custom compounds. Our main products include special-shaped elastomer components,O-rings, gaskets, oil seals, diaphragms, silicone tubes, and custom molded rubber parts.
Equipped with in-house mold development, compression molding, injection molding and extrusion lines, we support custom design, small-batch trial and mass production for global customers.
We serve industries including hydraulics, pneumatics,Grid automation, HVAC,Drilling Rigs, Hydraulics & Pump/Valve Industries and general industrial equipment. Our core advantages are stable quality, fast mold development, flexible customization and factory-direct supply.
We support custom manufacturing based on drawings, samples or equipment models, providing professional material selection, mold development and mass production for global industrial clients. Our core advantages include high precision, stable material performance, on-time delivery and professional after-sales support.
We are committed to being a reliable partner for industrial equipment, maintenance, engineering and OEM customers worldwide, providing one-stop solutions for precision elastomer and hydraulic control components.

1. Product Basics & Material Selection

Q: What materials do you offer for custom rubber parts?
A: We provide full custom rubber materials including:

– NBR: Oil-resistant, wear-resistant, cost-effective for general hydraulic/pneumatic systems.
​
– FKM/Viton: High temperature resistance, excellent chemical resistance for harsh oil/chemical environments.
​
– EPDM: Weather, ozone, steam and water resistance for outdoor, plumbing and HVAC.
​
– Silicone (VMQ): Wide temperature range, food-grade, medical-grade, low compression set.
​
– PU (Polyurethane): Extreme wear and pressure resistance for hydraulic seals and buffer parts.
​
– NR/CR: High elasticity, shock absorption, weather resistance for anti-vibration parts.

Q: How to choose rubber hardness?
A:

– Sealing applications: Shore A 50–90°
​
– Shock absorption & buffer: Shore A 30–60°
Higher hardness = better pressure resistance & wear resistance.
Lower hardness = better sealing & fitting performance.

Q: What tolerance can you achieve?
A:

– Normal molded parts: ±0.1~±0.3mm
​
– Precision custom profiles & sealing faces: ±0.05~±0.1mm
Tolerance depends on part structure, size and material.



2. Design & Structure FAQ

Q: What should I note when designing custom rubber profiles?
A:

– Avoid sharp corners and ultra-thin walls to prevent tearing or incomplete molding.
​
– Reserve 1.5%–3% shrinkage according to material.
​
– Consider compression, torsion and assembly direction to avoid stress concentration.
​
– Provide 2D/3D drawings for best accuracy.

Q: Why do seals fail or leak?
A: Common causes:

– Improper compression rate (too large → permanent set; too small → leakage).
​
– Material incompatible with medium (oil, water, acid, alkali, high temperature).
​
– Installation damage, eccentric wear or wrong groove size.
​
– Aging, ozone cracking or thermal degradation.

Q: Which seal is right for my equipment?
A:

– Static sealing (no movement): O-rings, gaskets, custom profile gaskets.
​
– Dynamic reciprocating/rotating: Piston seals, rod seals, oil seals, U-cups.
​
– High pressure: Combined seals, step seals, anti-extrusion backup rings.
​
– Irregular cavities: Fully custom molded rubber profiles.



3. Production & Customization

Q: What manufacturing processes do you use?
A:

– Compression molding: Mass production, stable quality.
​
– Injection molding: High precision, small parts, high efficiency.
​
– Extrusion & vulcanization: Rubber profiles, long strips, special sections.
​
– CNC machining: Prototypes, small batches, special-shaped parts.

Q: Do you accept custom molds and small orders?
A:

– We support custom mold design and manufacturing.
​
– Small quantity trial orders & prototypes are available.
​
– We can also reverse-engineer and reproduce based on samples.

Q: Can you make parts according to customer samples?
A: Yes. We can measure samples, test material properties, and reproduce identical or improved parts.



4. Application & Industry Solutions

Q: What industries do you serve?
A: Hydraulic & pneumatic, automotive, machinery, food & beverage, medical, HVAC, plumbing, outdoor equipment, packaging, drilling machinery, laser equipment, etc.

Q: Which material for food/medical equipment?
A: Food-grade silicone, EPDM with FDA, food-safe certifications, non-toxic, odorless.

Q: Which material for high-temperature or steam use?
A: Above 120℃ → FKM; -60℃~200℃ → Silicone; saturated steam → EPDM.

Q: Which material for hydraulic & oil systems?
A: NBR, PU, FKM with backup rings for high pressure anti-extrusion.



5. Order & Quality FAQ

Q: What documents do I need to provide for quotation?
A: 2D drawing (PDF/DWG), 3D model (STEP/IGS), material, hardness, quantity, working condition.

Q: Do you provide testing and certificates?
A: Yes, including material reports, hardness test, dimensional inspection, pressure test, food-grade/medical-related certifications as required.

Q: What is your lead time for samples and mass production?
A:

– Samples: 3–10 days
​
– Mold opening: 7–15 days
​
– Mass production: 10–30 days based on quantity