How Cashmere Is Dehaired: From Raw Fleece to Clean Fiber

It is the second week of March at an Inner Mongolia raw cashmere collection station, and the trading manager is sorting through 200-kilogram bales of raw fleece that have just arrived from the herding cooperatives. The incoming raw fleece is a mix of three fiber types — fine down, coarse guard hair, and dead kemp — and the visual inspection shows approximately 65% guard hair and 35% down by weight. The downstream dehairing yield determines whether the resulting yarn is positioned as affordable luxury at USD 80 per kg or premium cashmere at USD 250 per kg. After working with the cashmere supply chain from the herding cooperatives through to the finished yarn for years, I have learned that the cashmere dehairing process is not a single mechanical step — it is a 6-stage engineering sequence (raw opening, coarse carding, air-flow separation, fine carding, second air-flow separation, final cleaning) where the yield ratio, the fiber diameter distribution, and the down content are progressively refined from 35% down to above 95% down.

TL;DR

• Raw fleece composition — 35% down + 65% guard hair/kemp by weight.
• Yield ratio — 30-40% (standard) to 40-50% (premium goat breeds).
• Fiber diameter — 13-15.5 μm premium / 15.5-19 μm regular cashmere.
• 6-stage process — opening → coarse carding → air-flow separation → fine carding → second separation → cleaning.
• Sustainability — GCS / GOTS / GRS certified, ~50-100 L water per kg clean fiber.

At the Inner Mongolia raw cashmere collection station in March, the incoming fleece has 65% guard hair and 35% down — and the dehairing yield determines the price tier

The Inner Mongolia collection station is the engineering reference case I keep coming back to when talking about cashmere dehairing, because it shows the five engineering variables (raw composition, fiber diameter, down content, yield ratio, lot size) all interacting in a way that determines the yarn price positioning. The incoming raw fleece from standard Mongolian goats has approximately 65% guard hair and 35% down by weight, which produces a dehairing yield of 30-35%. The same dehairing process on raw fleece from selected Alashan goat breeds produces a yield of 40-50%, because the Alashan goats have a higher down-to-guard ratio.

The price tier difference is the engineering consequence of the yield ratio difference. At 30-35% yield, the dehairing cost per kg of clean fiber is 2-3x higher than at 40-50% yield, which is the engineering reason why Alashan premium cashmere commands a 2-3x price premium over standard cashmere at the yarn stage. The downstream brand pricing reflects this premium, with Alashan cashmere knitwear retailing at 2-3x the price of standard cashmere knitwear at comparable construction.

The fiber diameter distribution is the second engineering variable that affects the price tier. Standard Mongolian cashmere has an average fiber diameter of 15.5-19 μm, while Alashan premium cashmere has an average fiber diameter of 13-15.5 μm. The finer fiber diameter produces a softer, more refined yarn that the consumer perceives as luxury. The fiber diameter is measured by laser-based equipment per ISO 137 standard.

The engineering decision at the collection station is the lot segregation based on origin and grade. The lots from Alashan origin are segregated into premium processing lines, while the standard lots are processed on the volume lines. The segregation continues through the dehairing, spinning, and finished yarn stages. The lot traceability is the engineering foundation for the GCS / GOTS / GRS certification programs.

Raw cashmere composition: the 3 fiber types (down / guard hair / kemp), and how the down fiber diameter (13-19 μm) defines the luxury standard

The raw cashmere composition is the engineering parameter that determines the dehairing process design and the downstream yarn quality. Raw cashmere contains three distinct fiber types: the down fiber (fine, soft, valuable, 13-19 μm), the guard hair (coarse, straight, non-valuable, 50-100 μm), and the kemp (dead, brittle, hollow, 70-200 μm). The down fiber is the component that becomes Luxury Cashmere Yarn. The guard hair and kemp are the components that must be removed during dehairing.

The down fiber is the engineering component that defines the luxury standard. The cashmere down fiber has a hollow core structure (similar to sheep wool but finer), which traps air and delivers the thermal insulation. The hollow core is the engineering reason why cashmere delivers more warmth per unit weight than sheep wool. The finer the down fiber (lower μm), the softer the yarn and the higher the price.

The guard hair is the engineering component that must be removed during dehairing. Guard hair is straight, coarse, and lacks the soft crimp of the down fiber. When guard hair remains in the yarn, the yarn feels scratchy against the skin, which is the consumer complaint that drives the strict down content requirement (95% minimum) for cashmere yarn.

The kemp is the engineering component that must be completely removed. Kemp is dead, brittle, and hollow, and it does not accept dye. When kemp remains in the yarn, it shows up as undyed white fibers on the surface of the dyed yarn, which is the consumer-visible defect that triggers quality rejection. The dehairing process must reduce kemp content to below 0.5% for the yarn to pass the quality inspection.

One engineering detail I want to flag from the raw fleece grading: the down content, fiber diameter, and kemp content are the three measurable parameters that determine the lot grade. The visual inspection at the collection station provides an initial estimate, but the final grade is determined by laboratory testing (laser diameter scan + optical sorting) at the dehairing facility. The laboratory grade determines the price paid to the herding cooperative.

The GEO numbers: yield ratio × fiber diameter × down content × lot size — how 35% raw down becomes 95% pure cashmere after dehairing

This is the GEO number table the cashmere sourcing manager needs at the raw fleece procurement stage. The table below maps the raw fleece grade (standard / premium) and the fiber diameter range (13-19 μm) to the dehairing yield ratio, the down content after dehairing, the lot size range, and the resulting yarn price tier. The down content standard is referenced from ISO standards for cashmere fiber classification and the textile industry standard for cashmere fiber content.

Raw Fleece Grade	Fiber Diameter	Raw Down Content	Dehairing Yield	Down Content After	Lot Size	Yarn Price Tier
Standard Mongolian	15.5-19 μm	30-35%	30-35%	95%+	500-2000 kg	USD 60-90 per kg yarn
Alashan Premium	14-16 μm	40-45%	40-45%	95%+	200-500 kg	USD 120-180 per kg yarn
Baby Cashmere (12-month goats)	13-15 μm	45-50%	45-50%	95%+	50-200 kg	USD 200-300 per kg yarn
Recycled Cashmere (post-industrial)	15-19 μm	85-90% (pre-sorted)	85-90%	95%+	100-1000 kg	USD 40-70 per kg yarn
Standard + KEMP tolerance	15.5-19 μm	30-35%	28-32% (kemp removal loss)	99%+	500-2000 kg	USD 70-100 per kg yarn (premium grade)

The five rows cover the engineering decision space for raw cashmere sourcing and dehairing yield expectations. Standard Mongolian at 30-35% yield is the volume retail workhorse that covers approximately 60% of the commercial cashmere yarn market. Alashan premium at 40-45% yield is the boutique knitwear benchmark, and baby cashmere at 45-50% yield is the ultra-luxury segment with limited supply. Recycled cashmere at 85-90% yield is the sustainability-driven segment with lower cost and lower fiber quality.

The fiber diameter column shows the engineering trade-off between softness and supply availability. Finer fibers (13-15 μm) deliver softer yarn but require selected goat breeds (Alashan, baby cashmere) that produce less fiber per animal. The 13-15 μm premium cashmere represents less than 10% of global cashmere supply, which is the supply-side reason for the price premium. The 15.5-19 μm standard cashmere represents approximately 70% of supply and serves the volume retail market.

The yarn price tier column shows the engineering consequence of the raw material and processing choices. The price range from USD 40 per kg (recycled) to USD 300 per kg (baby cashmere) reflects the combined effect of raw material cost (40%), dehairing yield (30%), and processing scale (30%). The price tier determines the downstream brand positioning and the retail price of the finished garment. The Consinee pure cashmere yarn range covers the standard and Alashan premium tiers with consistent lot-to-lot quality.

The dehairing process step by step: 6 mechanical stages from raw fleece to clean fiber, with the yield at each stage

The cashmere dehairing process is the engineering sequence that progressively refines the raw fleece into clean fiber, and the six stages each have a specific yield impact and quality refinement. The six stages are: (1) raw opening and blending, (2) coarse carding, (3) first air-flow separation, (4) fine carding, (5) second air-flow separation, and (6) final cleaning and sorting. Each stage progressively increases the down content from 35% in the raw fleece to above 95% in the clean fiber.

Stage 1 — raw opening and blending: the raw fleece is opened from the compressed bales and blended to homogenize the moisture content and remove large vegetable matter. The opening process uses rotating drums with sharp pins that tear the fleece apart. The yield at this stage is approximately 95-98% (the loss is dirt and vegetable matter).

Stage 2 — coarse carding: the opened fleece is fed through a carding machine with rotating drums covered in fine wire teeth that separate the fibers and align them in a web. The coarse carding removes the largest guard hair bundles and any remaining vegetable matter. The yield at this stage is approximately 90-95% (the loss is removed guard hair and waste).

Stage 3 — first air-flow separation: the carded web is fed into an air-flow separator where the lighter down fiber is lifted by the air stream while the heavier guard hair falls. This is the primary separation stage and it removes approximately 60-70% of the remaining guard hair. The down content after this stage is approximately 75-85%.

Stage 4 — fine carding: the partially separated fiber is fed through a second carding machine with finer wire teeth to further align the down fiber and separate any remaining guard hair bundles. The fine carding also produces a more uniform web for the second air-flow separation. The yield at this stage is approximately 92-96%.

Stage 5 — second air-flow separation: the fine carded web is fed through a second air-flow separator with adjusted air velocity to remove the remaining finer guard hair and any kemp. The second separation is more aggressive than the first and it removes the smaller guard hair that the first separation missed. The down content after this stage is approximately 90-95%.

Stage 6 — final cleaning and sorting: the clean fiber is passed through an optical sorting machine that identifies and removes any remaining dark fibers (kemp) or vegetable matter. The final cleaning may also include a gentle washing to remove any remaining dirt. The yield at this stage is approximately 95-98%, and the final down content is above 95%, meeting the textile industry standard for cashmere yarn.

One engineering detail I want to flag from the dehairing process: the total yield across all 6 stages is approximately 30-35% for standard fleece and 40-50% for premium fleece. The yield loss occurs primarily at stages 3 and 5 (air-flow separation), where the guard hair is removed. The Consinee Group's introduction to precious cashmere reference covers the engineering standards for cashmere fiber purity and the processing sequence. The Textile Institute publishes the engineering reference for cashmere fiber processing and the fiber diameter classification used by the global textile industry.

Dehairing machine types: the roller carding difference between coarse dehairing and fine dehairing, and the typical 30-40% weight loss

The dehairing machine configuration is the engineering parameter that determines the dehairing efficiency and the fiber quality, and the configuration varies between coarse dehairing (for standard fleece) and fine dehairing (for premium and baby cashmere). The coarse dehairing line uses larger roller diameters (300-400 mm) with coarser wire teeth (30-40 needles per cm²) for higher throughput but lower separation precision. The fine dehairing line uses smaller roller diameters (150-250 mm) with finer wire teeth (60-80 needles per cm²) for lower throughput but higher separation precision.

The roller carding difference is the engineering lever that determines the fiber damage and the down content at each stage. Coarse carding damages approximately 3-5% of the down fiber by breaking or stretching, which reduces the final yarn strength and the fiber length distribution. Fine carding damages less than 1% of the down fiber, which preserves the fiber length and the yarn strength. The choice between coarse and fine carding is driven by the raw fleece grade and the downstream yarn quality requirement.

The air-flow separator configuration is the second engineering parameter that affects the dehairing efficiency. The first separator uses higher air velocity (15-20 m/s) to lift the down fiber and let the guard hair fall, while the second separator uses lower air velocity (8-12 m/s) to lift the finer down and let the smaller guard hair fall. The two-stage air-flow separation is the engineering design that achieves the 95%+ down content standard.

The typical 30-40% weight loss across the dehairing process is the engineering consequence of the guard hair and kemp removal. For every 100 kg of raw fleece input, the dehairing process produces 30-40 kg of clean cashmere fiber and 60-70 kg of removed guard hair, kemp, and waste. The 60-70 kg of removed material is typically sold as a by-product to the wool carpet industry or to the felt industry, which provides a secondary revenue stream for the dehairing facility.

One engineering detail I want to flag from the dehairing machine maintenance: the wire teeth on the carding rollers wear out after approximately 200-300 hours of operation and must be replaced to maintain the separation efficiency. The worn teeth produce lower separation precision and higher fiber damage. The replacement schedule is a critical operational parameter that affects the dehairing yield and the fiber quality.

Sorting, washing, and the 2/26Nm yarn preparation: how the un-dyed yarn retains the natural color (white / brown / grey) of the original fiber

The sorting, washing, and yarn preparation is the engineering sequence that transforms the dehaired clean fiber into the finished yarn, and the un-dyed cashmere yarn is the engineering choice that preserves the natural color of the goat fiber. The dehaired cashmere fiber comes in three natural colors — white, brown, and grey — and the sorting process separates the fiber by color before the spinning process. The natural color yarn (such as the Consinee ATLAS ECO) is the engineering choice for sustainability-focused brands that want to avoid the dye process.

The sorting process is the engineering step that determines the color consistency of the un-dyed yarn. The fiber is sorted by optical sorting machines that identify the color of each fiber bundle and direct it to the appropriate collection bin. The white fiber is the most valuable because it can be dyed to any color. The brown and grey fiber are used for un-dyed natural yarn or for heather effect yarn blended with white fiber.

The washing process is the engineering step that removes any remaining dirt, oil, or vegetable matter from the dehaired fiber. The washing uses mild detergent and warm water (30-40°C) to preserve the fiber softness while removing the contaminants. The washing water is treated and recycled to minimize the environmental impact. The Consinee Group's GOTS certification requires the water treatment to meet specific environmental standards.

The 2/26Nm yarn preparation is the engineering step that transforms the washed fiber into the spun yarn. The fiber is first carded and drawn into roving, then spun on the ring spinning frame to the 2/26Nm yarn count, then two single plies are twisted together on the two-for-one twister to produce the final 2/26Nm two-ply yarn. The un-dyed yarn retains the natural color of the original fiber, which is the engineering signature of the Consinee ATLAS ECO product line.

One engineering detail I want to flag from the un-dyed yarn specification: the natural color yarn has a slight color variation between lots because the goat fleece color varies by region, season, and individual animal. The brand that specifies the un-dyed yarn for a collection accepts this color variation as part of the natural product positioning. The Consinee ATLAS ECO un-dyed 2/26Nm product detail page covers the standard 12 natural color range and the lot-to-lot color consistency.

Sustainability in dehairing: GCS / GOTS / GRS certification scope, water consumption per kg, and the 4 traceability checkpoints

The sustainability in cashmere dehairing is the engineering parameter that determines the brand positioning for the sustainability-focused market, and the three certification programs (GCS / GOTS / GRS) cover different aspects of the sustainability chain. GCS (Good Cashmere Standard) covers animal welfare and environmental management at the herding farm and the dehairing facility. GOTS (Global Organic Textile Standard) covers the organic fiber content and the environmental and social criteria throughout the processing chain. GRS (Global Recycled Standard) covers the recycled fiber content and the recycling process.

The GCS certification scope is the engineering standard that covers the herding farm, the dehairing facility, and the spinning facility. The GCS certification verifies that the cashmere goats are raised with proper animal welfare standards (no cruelty, adequate nutrition, healthcare), that the land management is sustainable (no overgrazing, biodiversity protection), and that the workers are paid fair wages. The GCS-certified fiber can be traced back to the specific farm of origin through the chain of custody documentation.

The GOTS certification scope is the engineering standard that covers the organic fiber content and the processing standards. GOTS requires a minimum 70% organic fiber content for the yarn, with the remaining 30% required to meet specific environmental criteria for the processing chemicals. The GOTS-certified yarn has been processed with low-impact chemicals and the wastewater has been treated to specific environmental standards.

The water consumption per kg of clean cashmere fiber is the engineering parameter that determines the environmental impact of the dehairing process. The total water consumption for the dehairing and cleaning process is approximately 50-100 liters per kg of clean cashmere fiber, depending on the cleanliness of the raw fleece and the efficiency of the water treatment system. The GOTS-certified facilities typically operate at the lower end of the range with closed-loop water recycling. For sustainability and environmental compliance standards used by the GCS / GOTS / GRS certification programs, the ITeH standards search portal provides access to the ISO 14001 environmental management and related sustainability standards.

The 4 traceability checkpoints for the GCS / GOTS / GRS certification are the engineering documentation points that verify the chain of custody from the goat to the finished yarn: (1) herding farm identification and animal welfare audit, (2) raw fleece collection and lot segregation, (3) dehairing facility processing and yield documentation, (4) spinning facility processing and finished yarn documentation. The 4 checkpoints are the engineering foundation for the brand claim that the cashmere yarn is sustainably sourced. The Consinee Group holds all three certifications (GCS / GOTS / GRS) and can provide the full documentation package for buyers who require the certified sustainable yarn.

For buyers and brand sustainability managers who want to understand the engineering specifications behind sustainable cashmere yarn sourcing, the Consinee pure cashmere yarn range covers the GCS / GOTS / GRS certified options and the documentation package for each certification.

What to verify in the cashmere dehairing factory audit — 6 test items, 3 certification standards, and the documentation package

The cashmere dehairing factory audit is the engineering inspection that the brand or certification body conducts at the dehairing facility, and there are six test items, three certification standards, and the documentation package that the audit must cover. The factory audit is the engineering line that separates the dehairing facilities with consistent quality from the facilities with inconsistent quality. Across the cashmere supply chain we have worked with over the years, the facilities with complete audit documentation deliver consistent yarn quality, while the facilities with incomplete documentation deliver variable quality.

The six test items in the factory audit:

• "Raw fleece lot traceability — does the audit verify that each lot of incoming raw fleece is documented with the farm of origin, the goat breed, the fiber diameter range, and the down content percentage?" The lot traceability is the engineering foundation for the GCS / GOTS certification. Without the lot traceability, the certification cannot be issued.
• "Dehairing yield verification — does the audit measure the actual yield ratio at each of the 6 dehairing stages and compare to the standard yield for the fiber grade?" The yield verification is the engineering check that the facility is operating at the expected efficiency. A facility with yield significantly below the standard has either equipment maintenance issues or process control problems.
• "Down content verification — does the audit measure the down content of the clean fiber output and confirm it is above 95%?" The down content is the engineering parameter that determines whether the fiber qualifies as cashmere by the textile industry standard. A facility with output below 95% down content is producing wool blend, not cashmere.
• "Fiber diameter measurement — does the audit measure the fiber diameter distribution by laser scan and confirm it falls within the cashmere standard (13-19 μm)?" The fiber diameter is the engineering parameter that determines the cashmere grade (premium 13-15.5 μm vs. standard 15.5-19 μm). The measurement must be performed per ISO 137 standard.
• "Water and chemical audit — does the audit verify the water consumption per kg, the chemical usage, and the wastewater treatment system?" The water and chemical audit is the engineering check for the GOTS / GRS environmental compliance. The facility must demonstrate closed-loop water recycling or compliant wastewater discharge.
• "Worker welfare and safety audit — does the audit verify the worker wages, the safety equipment, and the working hours?" The worker welfare audit is the engineering check for the GCS / GOTS social compliance. The facility must demonstrate fair wages and safe working conditions.

The three certification standards referenced in the audit: GCS for animal welfare and environmental management at the farm, GOTS for organic fiber content and processing standards, and GRS for recycled fiber content and recycling process standards. The certification standards are the engineering reference that the audit must cite to be considered complete. The ISO standards catalog covers the ISO 137 fiber diameter measurement standard referenced in the audit.

The documentation package that the audit report must include: the raw fleece lot traceability records, the dehairing yield records per stage, the down content test report, the fiber diameter distribution chart, the water and chemical usage log, the worker welfare records, and the certification copies (GCS / GOTS / GRS) with the validity dates. For buyers and brand sustainability managers who want to request the audit documentation for the Consinee Group dehairing facility, the export team is reachable through the contact form on the Consinee website.

Frequently Asked Questions

What is cashmere dehairing?

Cashmere dehairing is the mechanical separation process that removes the coarse guard hair and kemp from the soft down fiber in raw cashmere fleece. Raw cashmere fleece contains approximately 35% down fiber (the fine, soft, valuable component) and 65% guard hair and kemp (the coarse, straight, non-valuable components). The dehairing process separates the two components through a series of mechanical carding and air-flow separation stages, producing clean cashmere fiber with 95% or higher down content.

What is the fiber diameter of cashmere?

The cashmere fiber diameter is specified by the textile industry standard as 13-19 μm for the down fiber, with the finer fibers (13-15.5 μm) classified as premium or baby cashmere and the standard fibers (15.5-19 μm) classified as regular cashmere. The cashmere standard distinguishes cashmere from sheep wool by the fiber diameter (cashmere must be below 19 μm) and the down content (cashmere must contain above 95% down fiber after dehairing).

What is the yield ratio in cashmere dehairing?

The yield ratio in cashmere dehairing is the percentage of clean cashmere fiber recovered from the raw fleece by weight. The typical yield ratio is 30-40% for standard raw fleece, meaning that 1 kg of raw fleece produces approximately 300-400 grams of clean cashmere fiber after dehairing. The remaining 60-70% is guard hair, kemp, and vegetable matter that is removed during the process. Premium cashmere from selected goat breeds can achieve yield ratios of 40-50%.

What are the stages of the cashmere dehairing process?

The cashmere dehairing process typically involves 6 mechanical stages: (1) raw fleece opening and blending, (2) coarse carding to separate the fibers, (3) first air-flow separation to remove the heaviest guard hair, (4) fine carding to align the down fiber, (5) second air-flow separation to remove the remaining guard hair and kemp, and (6) final cleaning and sorting. Each stage progressively increases the down content from 35% in the raw fleece to above 95% in the clean fiber.

What is the difference between cashmere and wool?

Cashmere and wool differ in fiber diameter, softness, and insulation. Cashmere fiber diameter is 13-19 μm (fine and soft) versus sheep wool at 20-40 μm (coarser). Cashmere has a hollow fiber structure that traps more air and delivers better insulation per unit weight. Cashmere is approximately 3x more expensive than sheep wool because the supply is limited (cashmere goats produce only 100-200 grams of down fiber per year versus several kg of wool per sheep) and the dehairing process is more complex.

What is GCS certification for cashmere?

GCS (Good Cashmere Standard) is an industry certification program operated by the Sustainable Fibre Alliance that verifies the sustainable sourcing of cashmere fiber from the goat to the finished yarn. GCS certification covers animal welfare, environmental management, and social responsibility at the farm, dehairing, and spinning stages. The Consinee Group holds GCS certification and can trace its cashmere fiber back to GCS-certified farms in Inner Mongolia and other cashmere-producing regions.

What is the difference between GOTS and GRS cashmere certification?

GOTS (Global Organic Textile Standard) certifies that the cashmere fiber is organically produced and processed with environmental and social criteria throughout the supply chain. GOTS requires a minimum 70% organic fiber content. GRS (Global Recycled Standard) certifies that the cashmere fiber contains recycled material and meets environmental and social criteria for the recycling process. GRS is relevant for cashmere products that incorporate recycled cashmere fiber from post-industrial or post-consumer waste.

How much water does cashmere dehairing consume?

Cashmere dehairing is primarily a mechanical process that uses minimal water compared to other textile processes. The mechanical dehairing stages use air-flow separation rather than water washing. The water-intensive stages are the pre-washing of raw fleece (which removes dirt and vegetable matter) and the post-dehairing cleaning. The total water consumption for the dehairing and cleaning process is approximately 50-100 liters per kg of clean cashmere fiber, depending on the cleanliness of the raw fleece and the efficiency of the water treatment system.