Medium Hardness of Office Chairs

The Shore hardness range for medium hardness of office chairs is roughly between 25-48HA, but the more precise comfort range is concentrated around 25-35d (Shore D durometer). This hardness can balance comfort and support.

1. Typical Medium Hardness Performance of Conference Chairs

As a frequently used setting, the cushion hardness design of conference chairs needs to balance comfort and durability. Regular conference chairs adopt a medium-soft hardness (Shore hardness 25-35d). This range has been experimentally verified to effectively disperse hip pressure, preventing poor blood circulation caused by excessive local pressure after prolonged sitting. At the same time, this hardness can prevent the cushion from collapsing due to long-term pressure, extending its service life. For example, a certain brand of conference chair maintained a cushion rebound rate of over 90% after 8 hours of continuous simulated use in a laboratory, confirming the practicality of medium-soft hardness.

2. Hardness Differences and Sensory Feedback of Different Office Chair Models

In actual products, there are differences between hardness values and sensory feedback. Taking the Wenyi Environmental Protection Office Chair (model WY-ES01) as an example, its cushion hardness is measured at 42HA (Shore A durometer). Although this value is close to the medium range, testers reported that it felt "relatively hard." This may be related to material density or structural design—high-density foam can provide stronger support, but if it lacks layered cushioning design, it can easily result in a hard feel. However, this model has a slight curve designed in the lumbar region, allowing some users to feel a "slight feedback sensation," indicating that the synergy between hardness and ergonomic design can optimize the experience.

Another office chair from Brand 1 (model B1-2023) has a hardness of 48HA, and testers clearly stated that it felt "hard" and that there was a "topping sensation in the lumbar region." This shows that when the hardness exceeds 45HA, even if the material itself has good elasticity, it may still cause local discomfort due to concentrated pressure, especially for people sensitive to the lumbar region. Such designs are more suitable for scenarios requiring strong support (such as prolonged fixed sitting for office work), but they need to be paired with adjustable lumbar supports to disperse pressure.

3. Selection Suggestions for Medium Hardness

Ordinary users should prioritize conference chairs with a Shore hardness of 25-35d, which offer a moderate softness and hardness suitable for most body types and usage scenarios. If stronger support is needed, models with a hardness of 40-45HA can be considered, but it is necessary to test sit to ensure there is no excessive pressure in the lumbar region. Additionally, hardness values are only for reference; the actual experience also needs to be evaluated in combination with cushion thickness, curved surface design, and material elasticity.