LSR Applications and Manufacturing in Adult Products

Liquid Silicone Rubber (LSR) has become the material of choice in the adult products industry due to its body-safe properties, soft tactile feel, and easy cleaning and sterilization.

1. Core Material Requirements

1.1 Biological Safety

• ISO 10993 biocompatibility testing
• Cytotoxicity: Grade 0 (non-toxic)
• Skin sensitization: Negative
• Skin irritation: Negative

1.2 Sensory Quality

• Soft touch: 20-00 Shore A (ultra-soft series up to 00-30)
• Smooth surface: Non-sticky feel
• Thermal sensation: Close to body temperature conductivity
• Odorless

1.3 Functional Requirements

• Waterproof: IPX7 and above
• Lubricant resistant: Water-based/silicone-based
• Antimicrobial surface
• Sterilizable: Boiling water/alcohol disinfection

2. LSR Material Selection

2.1 Medical-Grade LSR

• Platinum-catalyzed system (addition-cure)
• Free of DMC, D4, D5 harmful cyclics
• FDA 21 CFR 177.2600 compliant
• LFGB standard certified

2.2 Hardness Classification

Ultra-soft series (Shore 00 scale 00-10) for internal padding and bionic structures; main body soft sections use Shore A 10-30; shell and grip sections 30-50 Shore A; structural support and buttons 50-70 Shore A.

2.3 Special Function LSR

• Color-changing LSR: Changes color with temperature
• Fluorescent LSR: Glows in dark
• Conductive LSR: Electrical stimulation function
• Foamed LSR: Ultra-light, ultra-soft feel

3. Product Structure and Molding Process

3.1 Typical Product Structure

• Shell (LSR overmold/integral molding)
• Internal motor/vibration unit
• Electronic control board
• Charging module (magnetic/Type-C)
• Sealing structure (waterproof)

3.2 Overmolding Process

• Metal/plastic substrate pretreatment
• Primer application
• LSR injection overmolding
• Curing: 150-180 degrees x 40-60 seconds

3.3 Dual-Color/Dual-Hardness Molding

• Hard frame + soft surface
• Two hardnesses in one shot
• Seamless bonding, no parting line

4. Surface Treatment Technology

• Matte finish: Velvet touch
• Glossy finish: Mirror effect
• Textured: Skin-like texture
• Gradient color: Multi-color integral molding
• Post-processing: Feel oil coating, printing, flocking

5. Quality Control

• Material testing: Platinum content, volatiles, hardness consistency, tensile/tear strength
• Product testing: IPX7 waterproof, pull test, drop test (1.5m), functional test
• Safety testing: Full biocompatibility, phthalate testing, heavy metals, microbial

6. Industry Trends

• Material innovation: Ultra-soft LSR (Shore 00-10), self-healing LSR, thermo-sensitive LSR
• Process innovation: Primer-free self-adhesive LSR, multi-color one-shot molding, fully automatic insert placement

Conclusion

LSR applications in adult products represent the deep integration of material technology and user experience. Medical-grade safety, ultimate tactile feel, and precision molding make LSR an irreplaceable core material in this industry.