JZP-2.0B-SC Rubber Shock Absorber 2.0kg Nominal Load 41.5Hz Resonance Frequency UL94 V-0

What the designation tells you before you read a single number

The model string is a selection instruction, not a marketing name. JZP identifies the bonded rubber isolator family, 2.0 is the nominal load class in kilograms, and B-SC fixes the body geometry and the mounting arrangement used throughout this page. Buyers who need a different load pick another class from the same family; the body and the interface stay the same, which is what makes the series convenient to design around.

The load class matters more than the appearance of the part. A 2.0 kg mount compressed with 3 kg of equipment sits lower, stiffens, and its resonance moves upward — the isolation band you designed for quietly disappears. Treat 2.0 kg as a design value with a working window of 1.6–2.4 kg, and step up or down a class if your mass falls outside it.

Outdoor installations fail at the surface first, and that is where this mount is different

Most rubber mounts are dimensioned for load and then forgotten about the weather. In practice the first thing to fail on an outdoor installation is not the load path but the skin of the elastomer: ozone in coastal and industrial air attacks the strained surface, ultraviolet light breaks the polymer chains, and fine cracks appear at right angles to the stress direction. Once a crack opens, moisture and ozone reach the interior of the section, the crack grows, and the mount fails long before its rated life.

• Ozone resistance. The compound is protected against ozone cracking, which is why the mount survives near switchgear, along weld lines and in coastal plants where atmospheric ozone concentration is elevated.
• Ultraviolet resistance. The formulation is stabilised against UV-driven chain scission, so continuous sunlight does not harden and embrittle the surface into a brittle shell that spalls off in service.
• The result is mechanical, not cosmetic. Keeping the outer skin intact keeps the section intact. Stiffness, static deflection and the 41.5 Hz resonance stay where they were on the day of installation, which is the point of specifying a mount in the first place.

3. Fire behaviour: what a UL94 V-0 option actually buys

In an enclosed cabinet, a transport interior or any assembly mounted close to battery cells and power electronics, the concern is not whether the rubber burns — most organic elastomers will — but whether it keeps burning after the ignition source is gone and whether it drips flaming material onto what sits below.

• Self-extinguishing. A UL94 V-0 rated formulation stops burning within the short vertical burn window defined by the test and does not sustain flame after the igniter is removed.
• No flaming drip. The V-0 classification excludes cotton ignition by dripping material, which is the mechanism that turns a small local fault into a spread fire under a cabinet.
• Specified, not implied. The flame-retardant version is a distinct compound option inside the same JZP-2.0B-SC geometry, so load, resonance and interface are unchanged when you switch to it. State the V-0 requirement on the order, because the standard compound is not flame rated.

Where the installation is a plain indoor machine frame with no ignition risk nearby, the ozone and UV protection alone is usually the reason to pick this variant, and the flame-retardant option can be left out.

Mechanical and environmental data

Interface and envelope

Two frequency figures that must not be confused

Almost every specification error on this type of mount comes from reading one frequency number as if it were the other. The two figures below describe different things, and only one of them tells you what your equipment will experience.

Vibration and shock curves, and what produced them

• Vibration run: sweep 5–500 Hz at 1 oct/min, axial; 0.5 mm peak-to-peak below 20 Hz and 1 g above 20 Hz; 23 ±2 °C; 45–75% relative humidity.
• Shock run: 100 G half-sine, 6 ms, 12 consecutive axial shocks with a 2.0 kg test mass.
• Fixture used for both runs: steel base plate at least 20 mm thick on the shaker table, mount anchored through both Ø5.5 mm holes at 40 mm pitch, 2.0 kg steel block on the M4 thread at 1.2 N·m, accelerometers on plate and block.
• Applicable boundary: axial compression only. Not transferable to shear loading, to another load class, or to multi-mount arrays without re-testing.

Construction

The part is a single vulcanised assembly: an elastomer section bonded directly to its metal inserts during vulcanisation. Bonding rather than clamping means the rubber carries compression and shear through a continuous joint, so repeated shock cannot make the elastomer creep out of its housing, and axial and radial loads do not need separate retention hardware.

• Metal inserts are prepared and primed before vulcanisation so the joint forms chemically rather than relying on adhesion over a contaminated surface.
• The section geometry is chosen so that the axial stiffness that produces the 41.5 Hz resonance also produces the ≤0.3 mm static deflection at 2.0 kg. Load capacity and stiffness are one decision, not two.
• There are no sliding parts, no fluid and no seals, so there is nothing to leak, top up or re-torque over the 8-year life.