* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: ‘Segoe UI’, Arial, sans-serif;
}
body {
padding: 30px;
line-height: 1.6;
background-color: #ffffff;
color: #000000;
}
.container {
max-width: 1200px;
margin: 0 auto;
}
.intro-section {
background-color: #f9f9f9;
border: 1px solid #ddd;
padding: 20px;
margin-bottom: 30px;
border-radius: 4px;
font-size: 1.05rem;
}
header {
text-align: center;
margin-bottom: 40px;
padding: 25px;
background-color: #ffffff;
color: #000000;
border-radius: 4px;
border: 1px solid #000000;
}
h1 {
font-size: 2.2rem;
margin-bottom: 10px;
}
.subtitle {
font-size: 1.2rem;
color: #666666;
}
.card {
background-color: #ffffff;
border: 1px solid #000000;
border-radius: 4px;
margin-bottom: 30px;
overflow: hidden;
}
.card-header {
background-color: #ffffff;
color: #000000;
padding: 16px 20px;
font-size: 1.3rem;
border-bottom: 1px solid #000000;
}
.card-body {
padding: 20px;
overflow-x: auto;
}
table {
border-collapse: collapse;
width: 100%;
border: 1px solid #000000;
font-size: 1rem;
}
th, td {
border: 1px solid #000000;
padding: 12px 15px;
text-align: left;
}
th {
background-color: #f2f2f2;
color: #000000;
font-weight: 600;
}
tr:nth-child(even) {
background-color: #f9f9f9;
}
tr:hover {
background-color: #f1f1f1;
}
.category-row {
background-color: #e8e8e8;
font-weight: 500;
}
.notes {
margin-top: 40px;
padding: 20px;
background-color: #ffffff;
border-radius: 4px;
border-left: 4px solid #000000;
}
.notes h3 {
margin-bottom: 15px;
color: #000000;
font-size: 1.2rem;
}
.notes ol {
margin-left: 20px;
}
.notes li {
margin-bottom: 10px;
color: #666666;
font-size: 1.05rem;
}
.contact-section {
background-color: #f9f9f9;
border: 1px solid #ddd;
padding: 20px;
margin-top: 40px;
border-radius: 4px;
font-size: 1.05rem;
}
a {
color: #000000;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}

/* Responsive styles */
@media (max-width: 768px) {
body {
padding: 15px;
}
h1 {
font-size: 1.6rem;
}
.subtitle {
font-size: 1rem;
}
.intro-section, .contact-section, .notes li {
font-size: 0.95rem;
}
th, td {
padding: 8px 10px;
font-size: 0.9rem;
}
.card-header {
font-size: 1.1rem;
padding: 12px 15px;
}
.card-body {
padding: 15px;
}
}

/* Print styles */
@media print {
body {
padding: 0;
}
.intro-section, .contact-section {
background-color: white;
border: 1px solid #000;
}
.card {
box-shadow: none;
border: 1px solid #000;
}
.card-header {
background-color: #fff !important;
color: #000 !important;
border-bottom: 2px solid #000;
}
tr:nth-child(even) {
background-color: #fff !important;
}
tr:hover {
background-color: #fff !important;
}
}

The NEPEM Composite Ion Exchange Membrane, crafted via a proprietary tape-casting process, leverages perfluorosulfonic acid (PFSA) resin with optimized molecular weight and ion exchange capacity (IEC). Its uniform-thickness structure ensures reliability across electrolysis and electroplating applications, from ClO₂ generators and etching solution copper recovery to gold salt synthesis, amino acid purification, caustic soda production, and electrodialysis. Engineered for chemical stability and consistent ion transport, it delivers durable performance in industrial electrolytic/electroplating systems.

NEPEM Composite Ion Exchange Membrane

For Electrolysis or Electroplating Applications

Thickness and Basis Weight Properties

Membrane Type	Thickness (microns, μm)	Weight (g/m²)
N-417	260	340
N-4110	360	470

Physical and Other Properties

Properties	Index Parameters
Tensile Strength (MPa)	≥40
Elongation at Break (%)	≥100
Specific Gravity	1.35
Conductivity (S/cm)	≥0.100
Acid Capacity (meq/g)	1.00±0.05

Hydrolytic Properties

Properties	Index Parameters
Water Content (%)	5.0±3.0
Water Uptake (%)	50.0±5.0
Thickness Change, % Increase (23°C, 50% RH)
23°C soaked (%) from 50% RH	≤5
100°C soaked (%) from 50% RH	≤10
Linear Expansion, % Increase (23°C, 50% RH)
23°C soaked from 50% RH	≤2
100°C soaked from 50°C from 50% RH	≤5

Measurement Notes

Measurements were taken with the membrane conditioned at 23 °C and 50% relative humidity (RH) for 24 hours.
Conductivity measurements were conducted at 23 °C and 100% relative humidity (RH).
A base titration procedure is used to determine the equivalents of sulfonic acid groups in the polymer, which is then applied to calculate the acid capacity or equivalent weight of the pure polymer.
Water content of the membrane (dry weight basis) was determined with the membrane conditioned at 23 °C and 50% relative humidity (RH).
Water uptake of the membrane (dry weight basis) was measured by conditioning the membrane in water at 100 °C for 1 hour.
Tensile Test (conducted at 23 °C and 50% relative humidity (RH)).

For further information about our products, please feel free to contact us via email at support@atomfair.com. We look forward to engaging with you.

Engineering Polymers & Composites