SPI Membrane Storage Boxes

General properties of the membrane in the SPI Membrane Boxes

We present this information for those, who would consider using the SPI Membrane Boxes in extreme environments, that could push the limits of the materials of construction, or who might consider using the boxes in conjunction with materials, that might prove reactive to the membrane itself.

The following information has been provided by the manufacturer of the membrane polymer system. No guarantees are given as to the correctness or accuracy of the following information, but it is presented only as a guide for out-of-the-ordinary applications. Naturally, it is up to the user to do the required testing, as only they can make the final decision as to the suitability of these boxes and the membrane in a particular application.

General description:
The membrane polymer is a polyether polyurethane formulation designed for excellent clarity and sealability. The membrane film exhibits fine performance against the effects of fungus attack and high humidity. It also features enhanced UV stability.

Typical Properties:
The following technical information is meant to represent typical properties and not a specific specification for a particular batch of material.


Property                     Specification      Units        Values

Durometer                       D2240                          85A
Specific gravity                D792                            1.12

Thermal properties:
Maximum Service Temperatures
        Continuous                                °F        -60  to + 200
                                                  °C        -51  to + 93
Melting Point Range                               °F         345 to 385
                                                  °C         174 to 196
Tensile properties              D638                          15 mil sheet
Modulus @ 100% strain                             psi        800
Modulus @ 300% strain                             psi       1600
Modulus @ break                                   psi       6500
Modulus of elasticity
up to 10% strain                                  psi        Not available

Elongation at break                                %         500
Set at break                                       %          25-30

Tear Properties
     Die  C                     D624              pli        400

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