What is loss tangent (tan δ)
for shock absorbency?
Resin & Rubber + Shock Absorption Ranking
(in order of highest loss tangent (tan δ))
RLR (Rubber-Like Resin):
A Revolutionary Material Combining
High Tensile Strength and Elongation

Resin & Rubber + Shock Absorption (Loss Tangent (tan δ)) Ranking

What is loss tangent (tan δ) for shock absorbency?

Loss tangent (tan δ) is a measure indicating how much energy is converted into heat and other viscous losses when elastic or polymeric materials undergo vibration or deformation.
Materials with higher tan δ values more effectively absorb and dampen shock and vibration, though they tend to generate more heat and experience greater energy loss. The optimal tan δ value varies depending on the specific application and requirements—whether vibration damping, rebound properties, or minimal energy loss is desired.

Resin & Rubber + Shock Absorption Ranking (in order of highest loss tangent (tan δ))

Rank	Material/Classification	General tan δ range （room temperature, around 10Hz）	Characteristics and Applications
1	RLR（Rubber-Like Resin）	0.9	Combines softness and stretchability with impressive toughness. Highly resistant to puncturing—remains intact even when pierced with a screwdriver. Excellent scratch resistance and shock absorption properties.
2	SBR（Styrene-Butadiene Rubber） Thermosetting Rubber	0.4〜0.6	Synthetic rubber that effectively balances wear characteristics and vibration damping for tire applications. Though it has lower resilience than Natural Rubber, it efficiently absorbs vibration energy. Properties can be significantly adjusted by incorporating reinforcing agents such as carbon black.
3	NBR（Nitrile Rubber） Thermosetting Rubber	0.3〜0.5	Synthetic rubber with excellent oil and chemical resistance. Widely used in gaskets, seals, and hoses. Friction coefficient and vibration damping properties can be enhanced through compounding.
4	TPE-S（TPS） Styrenic Thermoplastic Elastomer SBS, SEBS, etc.	0.2〜0.5	Flexible elastomer commonly used in grip materials. Generally soft with high shock absorption properties. While oil and heat resistance are not as high as other TPEs, it tends to have relatively higher tan δ values.
5	CR（Chloroprene Rubber） Thermosetting Rubber	0.2〜0.4	Excellent weather resistance, ozone resistance, and flame retardancy. Used in industrial applications and wetsuits. Can exhibit relatively high vibration-damping properties depending on formulation.
6	TPE-E（TPC, Copolyester Elastomer） a type of Thermoplastic Elastomer	0.2〜0.3	Polyester-based elastomer known under brand names like Hytrel®. Combines excellent mechanical strength and oil resistance with moderate vibration damping properties.
7	TPU（Thermoplastic Polyurethane） a type of Thermoplastic Elastomer	0.15〜0.3	Features extremely high abrasion resistance, oil resistance, and mechanical strength while maintaining some elastic loss. Commonly used in applications requiring both shock absorption and strength, such as shoe soles and casters.
8	EPDM（Ethylene-Propylene Rubber） Thermosetting Rubber / also raw material for TPO/TPV	0.15〜0.25	Excellent weather and ozone resistance, widely used in outdoor applications and automotive parts (weather strips, etc.). Can provide moderate damping properties depending on formulation, though typically not achieving levels as high as NR/SBR.
9	NR（Natural Rubber） Thermosetting Rubber	0.05〜0.2	High elasticity and excellent rebound properties resulting in relatively low tan δ values. Widely used in tires, vibration-dampening components, and rollers. Strength and damping properties can be moderately enhanced with reinforcing agents.
10	BR（Butadiene Rubber） Thermosetting Rubber	0.05〜0.2	Features very high rebound elasticity and excellent stretchability. Commonly used in tires and shoe soles.

*Please note that the values presented in this ranking are general guidelines only. Actual values may vary significantly depending on the manufacturer, specific grade, and formulation.

RLR (Rubber-Like Resin): A Revolutionary Material Combining High Tensile Strength and Elongation

Traditional resin materials have struggled to balance flexibility and durability. To overcome this challenge, we've developed Rubber-Like Resin (RLR), which combines rubber-like flexibility with exceptional durability.

This innovative material features superior elasticity and scratch resistance, while also providing excellent vibration absorption and chemical resistance. Since it cures at room temperature, no heating furnace is required—contributing to energy efficiency. RLR can be utilized across diverse applications, from electronic component coatings to construction materials and automotive parts.

Key Advantages of Rubber-Like Resin Compared to Urethane Materials

Learn More About Rubber-Like Resin

Impact absorption comparison

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