Field Notes on Weak Acid Cation Exchange Resin D113 FC: Specs, use-cases, buyer tips

If you’re evaluating a Weak Acid Cation Exchange Resin for dealkalization or metal recovery, D113 FC from Lijia (origin: NO.2 East Jianshe Road, High-Tech Industrial Development South Zone Wei County, Xingtai, Hebei Province, China) is the one I’ve seen most frequently in mid-to-large industrial water rooms. It’s an acrylic, macroporous, carboxylic (-COOH) resin—practical, forgiving, and, to be honest, pretty cost-efficient when operated right.

Why the market cares now

Industry trend-wise, demand for Weak Acid Cation Exchange Resin has ticked up for three reasons: tighter alkalinity specs in beverage and electronics rinse lines, acid cost control (WAC resins can regenerate at modest concentrations), and sustainability pressure to recycle zinc/nickel. Many customers say WAC stages cut scaling, stabilize RO feed, and generally make downstream operations less cranky.

Product snapshot: D113 FC technical specs

Matrix / Porosity	Acrylic copolymer, macroporous
Functional group	Carboxylic (–COOH), H+ form as shipped
Total capacity	≈4.0–4.6 eq/L (real-world use may vary)
Moisture retention	≈50–60%
Particle size (typ.)	0.315–1.25 mm (16–50 mesh)
Operating pH	0–14; best dealkalization typically pH 4–7
Max temperature	≤80°C recommended (H+ stability up to ≈120°C)
Typical service flow	5–15 BV/h; ΔP depends on granulometry and bed depth

Where it shines

• Dealkalization: removal of bicarbonate/carbonate prior to RO or boilers.
• Metal recovery: zinc, nickel waste recycling loops.
• Biochemical separations: partial desalting/conditioning before downstream steps.

In fact, Weak Acid Cation Exchange Resin is superb at exchanging H+ for hardness tied to alkalinity, converting HCO3− to CO2—which then vents or is stripped. Less scaling, fewer headaches.

Process flow (proven in the field)

1. Hydration and backwash: classify bed, expand 50–70% if possible.
2. Regeneration: HCl 4–8% or H2SO4 2–5%, 1–3 BV at 1–2 BV/h.
3. Slow rinse then fast rinse to
4. Service run: 5–15 BV/h. Monitor leakage alkalinity; stop at breakthrough.
5. Testing: capacity and moisture per ASTM methods; particle size sieve checks.

Service life is commonly 3–5 years with clean feed and proper acid strengths. Fouling (iron/organics) shortens that—pretreatment helps.

Sample performance data (indicative)

Feed alkalinity 300 mg/L as CaCO3; 8 BV/h; 6% HCl regen. Effluent alkalinity

Vendor comparison (quick view)

Vendor / Grade	Polymer	Capacity (eq/L)	Acid use per regen (≈)	Certs	Lead time
Lijiresin D113 FC	Acrylic, macroporous	≈4.0–4.6	Low–moderate	ISO 9001; NSF/ANSI 61 option on request	Often 2–4 weeks
Generic WAC (Vendor A)	Acrylic, gel	≈3.6–4.2	Moderate	Varies	6–8 weeks
WAC (Vendor B, polystyrene)	Polystyrene	≈2.5–3.0	Higher	Varies	4–6 weeks

Customization, QA, and feedback

• Custom particle-size bands and pre-acidification skids available (ask for SDS and CoA).
• Testing to ASTM D2187; particle size by sieve analysis; moisture by loss-on-drying.
• Customers report stable pressure drop and predictable alkalinity break—surprisingly steady even at 10 BV/h.
• Common certifications: ISO 9001 at plant; potable-water grades aligned to NSF/ANSI 61 when specified.

Mini case notes

Electroplater (SE Asia): nickel rinse recovery >95% with Weak Acid Cation Exchange Resin, acid cut ≈18%. Beverage line (MENA): alkalinity from 280 down to 12 mg/L as CaCO3; RO scaling incidents dropped to zero over 9 months.

Citations

1. ASTM D2187 – Test Methods for Physical and Chemical Properties of Ion-Exchange Resins.
2. NSF/ANSI 61 – Drinking Water System Components – Health Effects.
3. ISO 9001:2015 – Quality management systems – Requirements.
4. WQA Technical Application: Dealkalization with Weak Acid Cation Exchange.