Silica Gel for Container Shipping — Specs, MOQ and Quantity Calculation

Why Choose Silica Gel for Container Shipping?

Container shipping presents three moisture challenges: (1) cargo moisture continuously released by the goods themselves, (2) condensation on container walls due to temperature swings (container rain), and (3) ambient humidity ingress when the container is opened for inspection or customs clearance. Silica gel addresses all three through physical adsorption — trapping water molecules in its microporous SiO₂ structure without changing physical state.

Key advantages over alternatives:

• vs Clay: Higher capacity per gram at low-to-medium RH (30–70%); FDA food contact approved; no performance drop below 10°C.
• vs CaCl₂: No leakage risk if packaging is damaged; safe for direct product contact; reusable up to 7 times after oven regeneration at 110–130°C.

See detailed comparison: Silica Gel vs Clay vs CaCl₂ for Container — Full Comparison.

Common Silica Gel Specs for Container Use

CEMACOSG supplies container-grade silica gel in four standard configurations:

• 500g non-woven bag, hanging hook — 18 × 25 cm; pre-fitted stainless steel hook; suitable for 20ft short-haul (<15 days) and low-moisture-sensitivity cargo.
• 1,000g non-woven bag, hanging hook (most popular) — 20 × 30 cm; hook rated for 2–3 kg; standard choice for 20ft and 40ft containers on 15–30 day routes. MOQ: 50 bags.
• 500g two-pouch hanging strip — Two 250g pouches connected by a cord; drapes over horizontal bars without a dedicated hook. Flexible for containers without hook rails.

Quantity Calculation by Container Type

Reference quantities for standard conditions (medium moisture sensitivity cargo, 20–30 day routes), per ASTM E96/E96M water vapor transmission methodology:

Container Type	Volume (m³)	Silica Gel 500g (bags)	Silica Gel 1,000g (bags)	Total Silica Gel Weight
20ft (DCU)	~33 m³	12–20 bags	6–10 bags	6–10 kg
40ft (DC)	~67 m³	24–32 bags	12–16 bags	12–16 kg
40ft HC (High Cube)	~76 m³	28–36 bags	14–18 bags	14–18 kg
20ft Reefer	~27 m³	10–16 bags	5–8 bags	5–8 kg

Adjustments:

• Short routes (<15 days): reduce by 20–30%.
• Long routes (>30 days) or high-RH tropical corridors: increase by 30–50% or supplement with CaCl₂ hanging strips on container walls.
• High moisture sensitivity cargo (pharmaceuticals, electronics): increase by 50–100% per customer specification.

MOQ and Ordering Conditions

Specification	Standard MOQ	Custom Print MOQ	Standard Lead Time
Silica Gel 500g hanging hook	50 bags	500 bags	1–3 business days
Silica Gel 1,000g hanging hook	50 bags	500 bags	1–3 business days
Silica Gel 500g two-pouch strip	100 bags	1,000 bags	2–5 business days

Blanket orders (3–12 month supply contracts with staggered delivery per container schedule) are available. Contact our sales team to discuss terms.

Certifications

• ISO 9001:2015 — Quality management system covering the full production process.
• HACCP — Hazard analysis and critical control points for food-contact applications.
• FDA 21 CFR 184.1711 — Silica gel recognized as GRAS (Generally Recognized as Safe) for direct food contact.

Technical documents available on request: Certificate of Analysis (CoA), MSDS/SDS, ISO certificate, HACCP certificate, Declaration of Conformity. Request documents: Contact CEMACOSG.

FAQ

How many 1,000g silica gel bags do I need for a 40ft container?

12–16 bags for a standard 40ft container on a 20–30 day route with medium moisture sensitivity cargo. Adjust upward for longer routes or high-sensitivity goods. Call CEMACOSG at +84 983 929 232 for a cargo-specific calculation.

Can silica gel bags be hung on container walls?

Yes. CEMACOSG's 500g and 1,000g non-woven bags come with pre-fitted stainless steel hooks designed for standard ISO 1496 container lashing rings. No additional hardware needed.

What is the difference between small silica gel packets (1–50g) and container bags (500–1,000g)?

Same SiO₂ composition, different application. Small packets (1–50g) go inside product packaging or carton boxes to control micro-climate around individual items. Large bags (500–1,000g) hung on container walls control the overall humidity of the entire container space.

Is silica gel reusable after a container trip?

Yes, if oven-regenerated. Heat to 110–130°C for 2–3 hours to drive off absorbed moisture. Reusable 5–7 times. Requires industrial oven capability. Color indicator turns from blue/orange to pink/white when saturated — signal to regenerate.

Which is better for a 20ft container: 500g or 1,000g bags?

Both work. Practically, 10 bags of 1,000g is easier to manage than 20 bags of 500g — fewer bags to count, track, and position. Use 500g when finer distribution across more hanging points is needed.