Custom Compound Development: How RubberQ Approaches Non-Standard Requests.

Custom Compound Development: How RubberQ Approaches Non-Standard Requests

Problem Statement

EPDM seals in EV battery cooling systems degrade after 500 hours at 150°C due to glycol-based coolant permeation. Standard EPDM compounds exhibit 40% compression set and 15% volume swell under these conditions.

Material Science Analysis

Glycol permeation causes polymer chain scission in EPDM’s diene backbone. RubberQ’s HNBR compound uses 36% acrylonitrile content and peroxide curing to:

• Reduce glycol absorption by 62% versus standard EPDM
• Maintain crosslink density above 4.5×10^-4 mol/cm³ at 150°C
• Prevent backbone degradation through saturated hydrocarbon structure

Technical Specifications

Parameter	HNBR-X7 (RubberQ)	Standard EPDM	FKM (GFLT)
Shore A Hardness	75 ±3	70 ±5	75 ±2
Tensile Strength (MPa)	22.4	16.8	18.5
Elongation at Break (%)	310	350	200
Continuous Service Temp (°C)	-40 to +175	-50 to +150	-20 to +200
Compression Set (70h/150°C, %)	18	40	12
Glycol Volume Swell (168h/150°C, %)	5.2	15.1	3.8

Standard Compliance

RubberQ’s IATF 16949 system ensures:

• Batch-to-batch viscosity variation <5% (ASTM D1646)
• Metal bond strength >3.5 MPa (ASTM D429 Method B)
• Cleanliness Class A per ISO 16232 for all molded parts

For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.