GB/T 26709-2011Rigid polyurethane foam for solar water heaters (English PDF)

1 Scope

This standard specifies the use of solar water heaters, rigid polyurethane foam requirements, test methods and inspection rules.

This standard applies to the polyisocyanate, polyether polyol, a blowing agent as the main raw material, mixed injection of solar water heaters

Hot water storage tank insulation layer of closed cell foam cavity foam molding prepared.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 2918-1998 plastic sample conditioning and testing of the standard environment

GB/T 6343-2009 foam and rubber Determination of apparent density

Determination of GB/T 8810-2005 rigid foam water absorption

GB/T 8811-2008 rigid foam dimensional stability test methods

Measuring performance GB/T 8813-2008 rigid foam compression

GB/T 10294-2008 steady insulation resistance and related properties - Guarded hot plate method

GB/T 10295-2008 steady insulation resistance and related properties - Heat flow meter

Determination of GB/T 10799-2008 rigid foam volume percentage of open and closed cells

GB/T 21332-2008 Determination of rigid foam water vapor transmission properties

3 Requirements

Product performance should be consistent with the requirements of Table 1.

Table 1 Performance Requirements

Project Unit

Performance

All water blowing agent systems other blowing agent systems

Thermal Conductivity

After manufacture 7d <= W/(m · K) 0.026 0.023

After manufacturing 28d <= W/(m · K) 0.030 0.028

Compressive strength or deformation of 10% compression stress >= kPa 150 130

Dimensional stability (100 ± 3) °C, 48h <=% 1.5

- (30 ± 3) °C, 24h <=% 1.0

The apparent core density kg/m3 32.0 ~ 45.0 30.0 ~ 40.0

Closed porosity (volume fraction) >=% 90

Water absorption (volume fraction) <=% 5.0

Water vapor permeability coefficient a (38 °C/Relative humidity 0 ~ 88%) <= ng/(Pa · m · s) agreed upon by both parties a general in the range <=6.5.

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