SCHWERLL publishes this product as a low-permeability diaphragm component for welded diaphragm accumulators. It is a component used within the accumulator assembly, not a complete accumulator pressure vessel. The manufacturer publishes a long-term OEM / matching-component context; exact host fitment and interchangeability require confirmation.
The official product page states that the described diaphragm is manufactured in France and references virgin-rubber material, simulation-based geometry, compression/expansion design, specialized adhesive and integral-molding manufacturing processes.
SCHWERLL also describes the diaphragm qualitatively in terms of low permeability, stable compression behavior and stable oil-drain deformation. The available evidence does not publish numeric permeability, gas-loss, cycle-life or service-life performance data. Multiple rubber materials are described qualitatively, without a supplied-component compound and media compatibility matrix.
The official product page lists a 0.1β4 L diaphragm specification range. The available English and Chinese sources do not define the exact engineering quantity represented by this range, so it must not be interpreted as a verified fluid capacity, gas capacity or host-accumulator nominal volume without technical clarification.
The product page references NF ISO37 / ISO37 material testing. This is a manufacturer-published material test-method statement, not a component certification or published test result. Exact edition, compound, specimen, batch, laboratory and test result are not identified. Exact host fitment, manufacturer part number, diaphragm geometry, rubber compound, media compatibility, temperature range and compliance documentation must be confirmed for the supplied component.