Battery packs take a beating on the road, and every bump travels through the enclosure into modules and cells. LXFP-256 liquid silicone foam sheet wraps the bottom of the pack or sits between modules, and its fine, uniform foam structure cushions those bumps first. Selection comes down to two choices: Shore C 25 or 50 sets the pad stiffness, and thickness (0.6 to 12.7 mm on the soft grade) sets the compression travel, so the equipment's dominant vibration falls in the isolation range.

Bumps are cushioned at the pad, so modules see steadier loads

The product page describes the LXFP256 series as a sealing gasket for EV battery enclosures that helps reduce bumps and vibration during vehicle operation. Wrapped under the pack or between modules, it provides shock cushioning and anti-slip support while also sealing and insulating, so one material covers two jobs and the bill of materials stays shorter.

Engineers comparing gas foam silicones, or simply searching for a silicone foam sponge or buffer pad, often start with density. For vibration damping, stiffness and thickness deserve the same attention, and LXFP-256 publishes both.

Two hardness grades let you pick the stiffness

The soft LXFP256-SD25 grade is 25±5 Shore C with a compression stress of 100±35 kPa at 25% deflection, suited to lightweight cushioning that needs high compressibility. The rigid LXFP-256-HD50 grade is 50±5 Shore C with at least 0.260 MPa at 25% deflection, suited to seals that need more support. Both compression values are listed against ASTM D1056-14, so they compare side by side.

A wide thickness range makes compression travel easy to plan

SD25 comes in standard thicknesses from 0.6 to 12.7 mm and HD50 at 2±0.2 mm, both 1000±20 mm wide and die-cuttable to your drawing. Under the same load, a thicker pad of the same material compresses more and has lower equivalent stiffness, which leaves more travel for damping.

Low compression set keeps the cushioning working

Both grades list a compression set of 5% or less after 24 hours at 100°C (ASTM D1056-14). The product page also notes good resistance to mechanical fatigue, compression set and creep under long-term load. A pad that does not take a set helps keep preload and damping travel close to the design value.

Light, heat tolerant and flame rated for battery packs

HD50 has a density of 0.72±0.06 g/cm³ and SD25 375±50 kg/m³. The recommended operating range is -55°C to 200°C, and the material is certified to UL 94 V-0. Battery packs are sensitive to both weight and heat, and a damping layer like this adds little of either burden.

Where it fits

Listed applications include waterproof sealing and vibration protection for EV battery packs, cushioning against cell expansion and contraction during charge and discharge, and vibration damping and component protection inside transportation and electronic equipment.

Engineering note: use transmissibility to avoid a pad that amplifies vibration

Model the battery module as mass M and the silicone foam pad as stiffness k with damping. The displacement transmissibility of a base-excited single-degree-of-freedom system is T = √[(1 + (2ζω/ω0)²) / ((1 − ω²/ω0²)² + (2ζω/ω0)²)], ω0 = √(k/M). T is the ratio of module displacement amplitude to base displacement amplitude (dimensionless); ω is the excitation angular frequency (rad/s); ω0 is the natural angular frequency (rad/s); ζ is the damping ratio (dimensionless); k is the equivalent pad stiffness (N/m); M is the supported mass (kg). Source: Newport (MKS) Fundamentals of Vibration technical note.

Setting T = 1 gives ω/ω0 = √2 regardless of damping. Below √2 times the natural frequency the pad amplifies vibration; above it, isolation begins. Moving to the softer SD25 grade or a thicker pad lowers k and ω0, extending isolation to lower frequencies. HD50 is stiffer with a higher ω0, which suits locations where sealing and support come first.

The model assumes a linear spring, viscous damping and steady sinusoidal excitation. Silicone foam is nonlinear and viscoelastic, its stiffness changes with compression, temperature and frequency, and the product page publishes no dynamic stiffness or damping ratio. Use the formula to compare selection directions only. It is not a product specification or guaranteed value, so confirm results with samples in your equipment.

Information to send with your inquiry

• Weight and mounting area of the supported part
• Available compression space and target squeeze
• Main vibration sources and approximate frequency range
• Operating temperature and any waterproof sealing need

LXFP-256 has low thermal conductivity, below 0.145 W/(m·K) for HD50 and about 0.12 W/(m·K) for SD25, so it insulates and cushions; where heat must be pulled away, evaluate a thermally conductive material instead. For sealing preload, see EV battery pack sealing with silicone foam squeeze and recovery.

Ready to add a damping layer to your design?

Send us your assembly drawing and operating conditions. Lixing can provide samples and specification support and die-cut parts to size. Start with the LXFP-256 product page and the full specification tables for both grades, then let's talk about your battery pack or equipment.

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