Platinum-Cured Inner Silicone Hose

Introduction

Platinum-cured inner silicone hose is a cost-effective composite silicone hose developed for food-grade fluid transfer, hydrogen fuel cell cooling loops, automotive coolant and low-odor fluid circuits. Unlike fully platinum-cured silicone hoses, this construction adopts platinum-cured silicone only for the inner media contact layer, while the middle reinforcement layer and outer cover use conventional DCBP-cured MVQ silicone.

Hydrogen Fuel Cell Hose-1

Food Grade Lined Silicone Hose

Construction Structure (Critical for Customer Clarification)

• Inner Layer: Platinum‑Cured Silicone (Addition Cure) Direct contact with coolant / circulating medium; low volatile extractables, low odor, non‑toxic, inert to ethylene glycol‑based coolants.
• Reinforcement Layer: Polyester / Aramid Fabric Embedded between inner and outer silicone layers, controls working pressure, burst pressure and shape retention. Ply count configurable: 2‑ply / 3‑ply / 4‑ply.
• Outer & Middle Matrix: DCBP‑Cured MVQ Silicone (Peroxide Cure) Cost‑effective high‑temperature silicone, excellent fabric bonding, ozone & heat resistance, stable physical performance for outer exposure.
• Manufacturing Process: Co‑extruded + integrated vulcanization, reliable interlayer bonding, no delamination under thermal cycling.

Performance Specifications

• Standard Compliance: SAE J20
• Continuous Temperature Range: -55 ℃ ~ +175 ℃
• Peak Temperature: up to 190 ℃ (short‑term)
• Reinforcement: 2 / 3 / 4 ply polyester or aramid
• Color: Custom solid colors; transparent / translucent optional for inner layer
• Additives: Anti‑fog additive, anti‑aging package available
• Marking: Silk screen logo, part number, specification, molded logo supported
• Tolerance: Custom ID, wall thickness, elbow shape, reducer profile per customer 2D/3D drawings

Core Advantages

• Clean wetted surface: Platinum‑cured liner eliminates peroxide residues, avoids coolant discoloration, odor and organic leaching under repeated heat cycles.
• Cost advantage vs full platinum hose: Only the media contact layer uses premium platinum silicone; bulk wall uses mature low‑cost MVQ compound.
• Proven mechanical reliability: Outer MVQ formula has long‑term automotive field history, strong bonding with reinforcement fabric, stable burst pressure.
• Flexible customization: Elbows, reducers, Y‑joints, special contours for radiator, heater, auxiliary cooling circuits.
• Weather & ozone resistance: Outer silicone resists UV, ozone and engine compartment heat aging.

Typical Applications

• Automotive coolant hoses, radiator hoses, heater hoses
• Bus, truck, off‑road vehicle cooling circuits
• EV auxiliary cooling loops where low‑odor coolant contact is required
• Equipment requiring low‑contamination fluid transfer, but without full sanitary grade requirement

Comparison Reference

Quality Concern

• Batch traceability for raw silicone compounds.
• Burst pressure, vacuum, heat aging, coolant compatibility tests available upon request.
• All custom shapes are produced and validated against customer drawings.
• Contact Hotop for sample testing, material certificates and quotation.