# Using Arial font for just one page and Mathpazo for rest

I'm writing a document using Memoir documentclass that requires just one page of the text to be in Arial font and for this I'm using the following code:

 \usepackage{helvet}
\renewcommand{\familydefault}{\sfdefault}


For the rest I'd like to use mathpazo, so I've loaded the mathpazo package (with small capitals support). When I use the code above the entire document gets the Arial font, so how can I restore back or change the font to Mathpazo?

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{mathpazo}
\usepackage{blindtext}
\renewcommand\familydefault{\sfdefault}
\begin{document}

Palatino: \blindtext
\newpage

\begingroup
\fontfamily{phv}\selectfont
Helvetica (Arial): \blindtext
\endgroup
\newpage

Palatino: \blindtext

\end{document}


The second page is in Helvetica, called Arial by Microsoft