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Heading (4-digit)

3903Polymers of styrene, in primary forms:

スチレンの重合体（一次製品に限る。）

HS code 3903 is a Heading (4-digit) classification number. In Japan's trade statistics (published by Ministry of Finance), it represents import/export items classified as “Polymers of styrene, in primary forms:”. This code has 5 subcategories defined below it.

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Latest trade statistics

In May 2026, Japan's imports under HS code 3903 (Polymers of styrene, in primary forms:) totaled ¥7B (YoY +65.7%), with a volume of 18,109,418 KG at about ¥361/KG. The top import sources are Republic of Korea (29.2%), Taiwan (22.7%), People's Republic of China (18.8%). Exports totaled ¥7B (YoY +15.9%), with a volume of 26,574,642 KG at about ¥275/KG. The top export destinations are People's Republic of China (37.1%), United States of America (9.9%), Thailand (9.1%).

Export (May 2026)
¥7B
YoY: +15.9%
Qty: 26,574,642 KG
Unit price: ¥275/KG
Import (May 2026)
¥7B
YoY: +65.7%
Qty: 18,109,418 KG
Unit price: ¥361/KG

Top export destinations (2025)

#CountryValueShareQtyUnit price
1People's Republic of China¥29B37.1%137,554,785 KG¥210/KG
2United States of America¥8B9.9%14,760,544 KG¥520/KG
3Thailand¥7B9.1%17,242,702 KG¥409/KG
4Viet Nam¥5B6.9%22,885,959 KG¥236/KG
5Indonesia¥4B5.6%13,702,216 KG¥318/KG

Top import sources (2025)

#CountryValueShareQtyUnit price
1Republic of Korea¥12B29.2%49,591,088 KG¥246/KG
2Taiwan¥9B22.7%47,092,891 KG¥201/KG
3People's Republic of China¥8B18.8%7,322,040 KG¥1,070/KG
4United States of America¥3B6.8%2,629,348 KG¥1,081/KG
5Malaysia¥3B6.2%8,353,584 KG¥310/KG

Subcategories5items

Subheading (6-digit)
390311Expansible:
Subheading (6-digit)
390319Other:
Subheading (6-digit)
390320Styrene-acrylonitrile (SAN) copolymers:
Subheading (6-digit)
390330Acrylonitrile-butadiene-styrene (ABS) copolymers:
Subheading (6-digit)
390390Other:

Related codes

Other codes in the same classification group

3901Polymers of ethylene, in primary forms:3902Polymers of propylene or of other olefins, in primary forms:3904Polymers of vinyl chloride or of other halogenated olefins, in primary forms:3905Polymers of vinyl acetate or of other vinyl esters, in primary forms; other vinyl polymers in primary forms:3906Acrylic polymers in primary forms:3907Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms:3908Polyamides in primary forms:3909Amino-resins, phenolic resins and polyurethanes, in primary forms:3911Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in Note 3 to this Chapter, not elsewhere specified or included, in primary forms:3912Cellulose and its chemical derivatives, not elsewhere specified or included, in primary forms:3913Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms:3915Waste, parings and scrap, of plastics:3916Monofilament of which any cross-sectional dimension exceeds 1 mm, rods, sticks and profile shapes, whether or not surface-worked but not otherwise worked, of plastics:3917Tubes, pipes and hoses, and fittings therefor (for example, joints, elbows, flanges), of plastics:3918Floor coverings of plastics, whether or not self-adhesive, in rolls or in the form of tiles; wall or ceiling coverings of plastics, as defined in Note 9 to this Chapter:3919Self-adhesive plates, sheets, film, foil, tape, strip and other flat shapes, of plastics, whether or not in rolls:3920Other plates, sheets, film, foil and strip, of plastics, non-cellular and not reinforced, laminated, supported or similarly combined with other materials:3921Other plates, sheets, film, foil and strip, of plastics:3922Baths, shower-baths, sinks, wash-basins, bidets, lavatory pans, seats and covers, flushing cisterns and similar sanitary ware, of plastics:3923Articles for the conveyance or packing of goods, of plastics; stoppers, lids, caps and other closures, of plastics:3924Tableware, kitchenware, other household articles and hygienic or toilet articles, of plastics:3925Builders' ware of plastics, not elsewhere specified or included:3926Other articles of plastics and articles of other materials of headings 39.01 to 39.14:

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