# HB Opaque EP material creation inputs

**URL:** <https://discourse.ladybug.tools/t/hb-opaque-ep-material-creation-inputs/9370>\
**Category:** honeybee-legacy\
**Tags:** energyplus, honeybee, radiation\
**Created:** [April 15, 2020, 7:22pm UTC](https://discourse.ladybug.tools/t/hb-opaque-ep-material-creation-inputs/9370 "2020-04-15T19:22:35Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![TrevorFedyna](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/trevorfedyna/32/15628_2.png) [@TrevorFedyna](https://discourse.ladybug.tools/u/TrevorFedyna)\
**Post date:** [April 15, 2020, 7:22pm UTC](https://discourse.ladybug.tools/t/hb-opaque-ep-material-creation-inputs/9370/1 "2020-04-15T19:22:35Z")

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Apologies if this topic has already been covered;

I am in the midst of detailing the EP construction of the surfaces in a project, with the intention of making the results as accurate as possible I am using the Honeybee\_EnergyPlus Opaque material component to create an EP material for the tentative insulation being used.

My question is in regards to the input for _thermAbsp_ (Thermal absorptance)

once again apologies; my only degree is from google and youtube universities: If I am not mistaken the input param being requested is for the emissivity, is this asking for Hemispherical (_ε_), Spectral Hemispherical (_ε_/ν or _ε_/λ) or directional emissivity _ε_/Ω?  
@MingboPeng You laid the groundwork for PassiveBee perhaps you can shed light on the matter?

I am transcribing the construction from WUFI passive and said material properties if I am not mistaken are not referenced. once I get a handle on deriving the input param from other material data that is available I will most definitely make a component to handle the calculations and share!

WUFI material properties for reference:

 ![gutex](https://discourse.ladybug.tools/uploads/default/original/2X/6/6674b87e49c97aacd4085de222978957ccb22e6f.jpeg)

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**Author:** ![AbrahamYezioro](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/abrahamyezioro/32/3_2.png) [@AbrahamYezioro](https://discourse.ladybug.tools/u/AbrahamYezioro)\
**Post date:** [April 15, 2020, 8:12pm UTC](https://discourse.ladybug.tools/t/hb-opaque-ep-material-creation-inputs/9370/2 "2020-04-15T20:12:56Z")

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> [@TrevorFedyna](#):
>
> My question is in regards to the input for _thermAbsp_ (Thermal absorptance)

Check the input/output reference for all E+ definitions. [Here](https://bigladdersoftware.com/epx/docs/9-3/input-output-reference/group-surface-construction-elements.html#field-thermal-absorptance) the link for your question.  
-A.

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**Author:** ![TrevorFedyna](https://discourse.ladybug.tools/user_avatar/discourse.ladybug.tools/trevorfedyna/32/15628_2.png) [@TrevorFedyna](https://discourse.ladybug.tools/u/TrevorFedyna)\
**Post date:** [April 15, 2020, 8:15pm UTC](https://discourse.ladybug.tools/t/hb-opaque-ep-material-creation-inputs/9370/3 "2020-04-15T20:15:15Z")

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Thank you! That is exactly the info I Needed.