Low Modulus and Stress Relief Principles in Soft Potting for Precision Electronics

Precision electronics fail under encapsulation stress through three mechanisms: cure shrinkage pulling on joints as the material sets, coefficient of thermal expansion (CTE) mismatch between silicon dies (about 3 ppm/C), FR-4 boards (14-17 ppm/C), aluminum housings (23 ppm/C) and potting compounds (100-250 ppm/C for epoxies), and vibration fatigue hardening with age. Hard materials constrain movement, so thermal cycling converts CTE mismatch into cyclic stress on solder joints until fatigue cracks form. Jelly gel breaks this chain: Hong Ye HY-9405 cures with shrinkage below 0.1 percent versus 2-5 percent for epoxies, and its penetration 170 plus or minus 30 jelly consistency means modulus low enough (in the kilopascal rather than megapascal range) that differential expansion deforms the gel instead of stressing joints. The gel still damps vibration and blocks moisture, but through viscoelastic compliance rather than rigid support, which is the fundamental principle behind soft potting.

PRODUCT REQUIREMENTS

Stress-relief potting requires: cure shrinkage below 0.1 percent; modulus low enough to absorb CTE mismatch (gel state, kilopascal range); vibration damping through viscoelasticity; no component force during dispensing; stable hardness across batches; and combined moisture and dielectric protection.

CORRESPONDING PRODUCT MODEL PARAMETERS

Recommended model: HY-9405 - Blue medium-tack grade for electronic potting, meter sealing, waterproofing and vibration damping

GRADE SELECTION GUIDE

FREQUENTLY ASKED QUESTIONS

Q: Why does epoxy crack solder joints but gel does not?

A: Epoxy has megapascal modulus and large CTE, so thermal movement transfers as joint stress; gel modulus is orders of magnitude lower, so movement deforms the gel instead.

Q: Does soft gel still damp vibration?

A: Yes. Viscoelastic jelly dissipates vibration energy through micro-deformation, often outperforming rigid potting that transmits vibration directly to joints.

Q: How is modulus guaranteed batch to batch?

A: Penetration (0.1mm) is tested per batch with COA; HY-9405 is held at 170 plus or minus 30, giving a consistent stress environment.

QUALITY ASSURANCE & CERTIFICATION

Every batch of Hong Ye HY-94 series jelly gel is produced under ISO 9001 certified quality management in a dedicated silicone workshop, with incoming raw-material inspection, in-process mixing control and finished-product testing on every batch. Before release each lot is checked for viscosity, mix ratio, cure time, penetration, color and tack, and a Certificate of Analysis (COA) listing the actual measured values ships with every order. Standard grades carry RoHS 2.0 and REACH SVHC test reports; skin-contact and baby-care grades can be supplied with FDA 21 CFR 177.2600 and LFGB Section 30/31 reports and, on request, ISO 10993 biocompatibility testing; flame-retardant grades meet UL94 V-0. Food-contact, medical and export orders are supported by the corresponding compliance files for customer qualification. Hong Ye has manufactured and supplied jelly gel to contractors, filter builders and equipment makers in over 60 countries since 2005, with monthly capacity above 500 tons, batch traceability and multi-language documentation. Application engineers provide grade selection, sample evaluation, on-site or video pouring guidance and after-sales follow-up, and technical data sheets (TDS), safety data sheets (SDS) and test reports are available before order to support tender and audit processes.

CONCLUSION

The market for tank sealant jelly gel in this application area continues to expand as cleanroom construction, electronic encapsulation, automotive electrification, energy storage and consumer product manufacturing drive demand for reliable two-component addition-cure silicones. Hong Ye supports this growth with ISO 9001 certified production, 500-plus ton monthly capacity, complete compliance documentation and responsive application engineering. Buyers evaluating suppliers are advised to look beyond unit price and compare batch-to-batch consistency, documentation completeness, delivery stability and technical service responsiveness, because the cost of a sealing or potting failure - rework, downtime, certification delay or product recall - far exceeds the incremental cost of a quality gel. Choosing the correct grade for the channel, operating temperature and service environment, following the 1:1 mixing and pouring procedure and validating with a small trial batch all help secure a durable seal. Hong Ye welcomes sample requests and application enquiries; our engineers will recommend the HY-9400, HY-9405 or HY-9409 grade that matches the sealing or potting requirement and support qualification from first sample through volume production.